41results about How to "Change swing" patented technology

The invention belongs to the technical field of medical instruments, and particularly relates to a lower limb rehabilitation training device which comprises a sitting plate and a bottom plate, supporting legs are arranged on the lower end face of the sitting plate, a backrest is hinged on one side of the sitting plate, a lifting supporting structure is mounted on the backrest, a speed reducing motor is mounted on the bottom plate, an output shaft of the speed reducing motor is mounted with a connection plate, a rotating shaft is mounted at the free end of the connection plate, a moving plate is arranged above the connection plate, a kidney hole is formed in the moving plate, the free end of the rotating shaft is penetratingly arranged in the kidney hole, a roller is movably arranged in a sliding rail in a sleeved manner, a supporting column is arranged at each of two ends of the sliding rail, the sliding rail is mounted on the bottom plate through the supporting columns, the sitting plate is fixedly connected with the supporting columns, a first moving part is hinged on a rack, a second moving part is hinged at the free end of the first moving part, length of each of the first moving part and the second moving part is adjustable, and the free end of the second moving part is hinged to the supporting columns. The invention aims to solve the problems of low adaptability and highrequirements on motors caused by structural defects of existing lower limb rehabilitation training devices.

The invention provides a robot fish and a fishtail working principle thereof, and relates to the field of mechanical fish. The robot fish comprises a fish main body and a fishtail, wherein the fishtail comprises a plurality of first frame bodies which are hinged sequentially to form a fishtail main body; one end of the fishtail main body is hinged to a second frame body serving as a tail fin; the other end of the fishtail main body is hinged to a third frame body; a mounting groove is formed in the third frame body; the robot fish further comprises a connecting part; the middle part of the connecting part is hinged to the third frame body; an adjustable eccentric wheel device which allows the third frame body to swing horizontally in the horizontal direction relative to the connecting part is arranged at one end, extending to the mounting groove, of the connecting part, and the other end of the connecting part is connected to the fish main body; a driver for driving the adjustable eccentric wheel device is arranged in the fish main body. The robot fish has the benefits that complete fishtail-type swinging of the fishtail can be realized, the robot fish can swim freely in water, and swimming of the robot fish can be more real.

The invention discloses an intermittent linear conveying device, and belongs to the field of conveying equipment for intermittently and linearly conveying objects. A material moving cam (10) is connected with a material moving connecting rod (11), the material moving connecting rod (11) is connected to a vertical guide mechanism in a sliding mode, and a material moving shifting pawl (1) is fixedly connected with the vertical guide mechanism. The vertical guide mechanism is horizontally arranged on a vertical sliding plate (31) in a sliding mode, the vertical sliding plate (31) is vertically arranged in a sliding mode and is connected with a material moving lifting cam (16), the material moving cam (10) drives the material moving shifting pawl (1) to advance or retreat in place through the material moving connecting rod (11), and the material moving lifting cam (16) drives the material moving shifting pawl (1) to ascend and descend through the vertical sliding plate (31). A locating cam (14) is connected with a locating connecting rod (35) which is vertically arranged in a sliding mode, a locating shifting pawl (2) is fixedly connected with the locating connecting rod (35), and the locating cam (14) drives the locating shifting pawl (2) to ascend and descend. The intermittent linear conveying device has the advantages of being accurate in conveying position and reliable in motion, improving work efficiency and the like.

The invention discloses a vertical type net laying device capable of adjusting upright cotton density. The vertical type net laying device capable of adjusting the upright cotton density comprises a reciprocating type cotton feeding system, a vertical type cotton arrangement system and a horizontal conveying belt, the reciprocating type cotton feeding system comprises a reciprocating power part and a cotton feeding part mutually connected, a cotton feeding groove is formed in the middle of the cotton feeding part, the outlet of the cotton feeding groove is communicated with the inlet of a forming tunnel in the vertical type cotton arrangement system, the outlet of the forming tunnel is communicated with the horizontal conveying belt below the outlet, the vertical type cotton arrangement system comprises three layers, and each layer comprises a left cotton arrangement roll set and a right cotton arrangement roll set bilaterally symmetrical to the forming tunnel. When using, the density of a final product can be changed through setting different running speeds for left and right cotton arrangement roll sets in each layer. The vertical type net laying device capable of adjusting the upright cotton density is capable of adjusting the density and width of the upright cotton, and moreover, the structure is simple, and the operation is facilitated.

The invention relates to a small-scale screening device which is formed by a screening groove, a screen mesh, an outlet material baffle, a support, a rotating shaft, a motor and the like. The screening groove is formed by welding a semicircular cylinder and an end cover and is supported by the rotating shaft to complete pendular motion; the screen mesh is fixed in a rectangular screen mesh frame and installed in the middle of the screening groove in a detachable mode, and screen meshes with different screen holes are easy to replace; the outlet material baffle is installed on the periphery of the screening groove and is welded together with the support, a certain interval or gap is formed between the inner wall of the outlet material baffle and the outer wall of the screening groove, and overall swinging of the screening groove is not affected; the motor is connected with the rotating shaft through a circuit, and swinging frequency and amplitude of the screening groove are regulated through the motor. The screening device can effectively control standing time of materials in the screening groove on the screen mesh, blocking phenomena are not easily formed, the purpose of screening is rapidly realized, regulation performance is good, operation is stable, and the screening device can be widely applied to screening of the related industries of particles in food, medicine, the chemistry industry, the light industry and the like and is utilized on occasions where liquid and solid are rapidly separated.

The invention provides a yarn sequin sewing device of a multi-needle sewing machine, and belongs to the technical field of sewing machines. The device solves the problems of low sewing quality and low production efficiency of the conventional sequin sewing device. The yarn sequin sewing device of the multi-needle sewing machine comprises a needle plate positioned on a workbench plate of a frame, a cutter arranged on a machine needle seat and feeding push rods corresponding to machine needles in quantity; a guide mechanism capable of guiding feeding of sequins is arranged on the needle plate; and a mounting seat is fixedly connected to the end face of the frame, the mounting seat is connected with a push rod fixing rack through a rotating shaft, the feeding push rods are connected to the push rod fixing rack and can swing around the joints, and a driving mechanism capable of driving a push rod fixing seat to swing around the axial line of the rotating shaft through a transmission main shaft so that the feeding push rods push the sequins in the guide mechanism out one by one is also arranged on the mounting seat. According to the sequin sewing device, synchronism of the machine needles and the push rods is high, and the yarn sequin sewing quality is improved.

The invention discloses a swivel chair base capable of leaning forward in an adjustable mode. A swivel chair supporting rod is installed through a swivel chair rod hole in a subbase, an intermediate plate is installed above the subbase in a matched mode through a leaning rotation shaft, and the leaning rotation shaft is hinged to the vertical wall of the intermediate plate and the vertical wall of the subbase; a forward leaning plate is installed above the intermediate plate in a matched mode through a forward leaning bottom rotation shaft or forward leaning middle rotation shaft, and the forward leaning bottom rotation shaft is hinged to the vertical wall of the forward leaning plate and the vertical wall of the subbase; the forward leaning middle rotation shaft is hinged to the vertical wall of the forward leaning plate and the vertical wall of the intermediate plate. The swivel chair base and a chair back can lean forward simultaneously in a matched mode so as to fit the back, waist and whole pelvis of people who sit on a chair and better accord with human engineering; people feel more comfortable. The design can improve the practicality of the product, meet the requirements of consumers, and facilitate market expansion and product upgrading for enterprises.

The invention discloses a mechanical solid lump environment-friendly pulverizing method. A base is involved. According to the characteristics of the method, a slide is formed in one side of the upperend surface of the base; a lug at the lower end of a first wedge block is arranged in the slide in a matched mode; a stand column, a groove, symmetric vertical rods and a powder containing box are fixed to the base; symmetric rails are arranged in the groove; a circular ring at the end of the stand column is hinged to a center shaft of a rotating wheel; the rotating wheel is eccentrically and fixedly connected with a cylinder which is embedded into a slide groove; one end of the slide groove is fixedly connected with the upper end surface of the first wedge block; an inclined surface of the first wedge block is matched with an inclined surface of a second wedge block; the second wedge block is fixedly connected with one ends of two springs and two circular rods; the other ends of the springs are fixedly connected with one sides of circular rings at the ends of the corresponding vertical rods; and the circular rods penetrate through the corresponding springs and the circular rings at the ends of the corresponding vertical rods, and the other ends of the circular rods are fixedly connected with pushing blocks correspondingly.

The invention discloses a helical gear defecting shaking device. The helical gear deflecting shaking device solves the problem of reciprocating failures of the swing arms of cam transmission devices in the prior art. The helical gear deflecting shaking device comprises a machine table, a driving shaft, a driven shaft with both ends fixed to the machine table, a left limit switch and a right limit switch, wherein the left limit switch and the right limit switch are arranged on the machine table. The driving shaft and the driven shaft achieve transmission through a helical gear, the middle of the driving shaft is provided with a rotating rod perpendicular to the driving shaft, one end of the driven shaft is provided with a swing rod, helical gears on the driven shaft are composed of a left portion and a right portion, and the end surface of each of the two portions is provided with an inverted conical projection and an inverted snapping slot. The helical gear deflecting shaking device is convenient to operate.

The invention discloses a clamp holder with an elastic partition plate. The clamp holder with the elastic partition plate can clamp workpieces in various shapes and different sizes and comprises an air chamber wall and a guide base attached to the end face of the air chamber wall. A cavity is formed between the guide base and the air chamber wall. The elastic partition plate is arranged in the cavity and divides the cavity into an air chamber and a containing cavity. The air chamber wall is provided with an air inlet valve communicated with the air chamber. A guide hole is formed in the middle of the guide base. An installation base attached to the elastic partition plate is arranged in the containing cavity. The installation base is fixed to one end of a push rod. The push rod penetrates the guide hole. Reset springs are arranged at the positions, located between the installation base and the inner wall of the guide base, on the periphery of the push rod. Two L-shaped swing claws are arranged on the sides of the guide base. One end of each L-shaped swing claw is a clamping end for the workpieces, the middle of each L-shaped swing claw is hinged to the guide base, and the other end of each L-shaped swing claw is hinged to the other end of the push rod.

The invention discloses a mechanical solid cake smashing environmental protecting device comprising a base. The mechanical solid cake smashing environmental protecting device is characterized in thata slideway is arranged on one side of the upper end face of the base; a lug at the lower end of a first wedge block is arranged in the slideway in a matched mode; an upright, a trough, symmetrical vertical rods and a powder holding box are fixed to the base; symmetrical rails are arranged in the trough; a ring at the end of the upright is hinged to a center shaft of a runner; the runner is connected with a cylinder eccentricity and fixedly; the cylinder is embedded into a sliding groove; one end of the sliding groove is fixedly connected with the upper end face of the first wedge block; the bevel of the first wedge block is matched with the bevel of a second wedge block; the second wedge block is fixedly connected with two springs and one ends of two round rods; the other end of each spring is fixedly connected with one side of a ring at the end of the corresponding vertical rod; and each round rod penetrates through the corresponding spring and the ring at the end of the correspondingvertical rod, and the other end of each round rod is fixedly connected with a pushing block.

The invention discloses a vertical type net laying device capable of adjusting upright cotton density. The vertical type net laying device capable of adjusting the upright cotton density comprises a reciprocating type cotton feeding system, a vertical type cotton arrangement system and a horizontal conveying belt, the reciprocating type cotton feeding system comprises a reciprocating power part and a cotton feeding part mutually connected, a cotton feeding groove is formed in the middle of the cotton feeding part, the outlet of the cotton feeding groove is communicated with the inlet of a forming tunnel in the vertical type cotton arrangement system, the outlet of the forming tunnel is communicated with the horizontal conveying belt below the outlet, the vertical type cotton arrangement system comprises three layers, and each layer comprises a left cotton arrangement roll set and a right cotton arrangement roll set bilaterally symmetrical to the forming tunnel. When using, the density of a final product can be changed through setting different running speeds for left and right cotton arrangement roll sets in each layer. The vertical type net laying device capable of adjusting the upright cotton density is capable of adjusting the density and width of the upright cotton, and moreover, the structure is simple, and the operation is facilitated.

The invention provides an adjustable screening device for feed raw material processing and crushing. The outer surface of a rotating column is sleeved with a sleeve, the top of the sleeve is movably connected with an adjusting plate, the interior of the adjusting plate is slidably mounted on the front and rear surfaces of a sleeving head, and the sleeving head is slidably mounted at the inner end of the rotating column; and the sleeving head is movably installed in a swing rod, a screening barrel is fixedly installed on the outer surface of the swing rod, and a material receiving box is arranged below the screening barrel. After crushed feed falls into the screening barrel through a hose, the adjusting plate on the surface of the sleeve pulls the sleeving head to move, so that in the rotating process of the rotating column, the sleeving head is driven to swing front and back in the rotating process, the sleeving head drives the screening barrel on the top of the swing rod to swing front and back when swinging, screened feed particles fall into a receiving box, feed products meeting the particle size requirement can be quickly screened out, feed is in a moving state in the screening process, and the screening effect is improved.

The invention discloses a cam spring plate mechanism which solves the problem that in the prior art, a reciprocating moving mechanism easily deforms a part during machining. The cam spring plate mechanism comprises a machine frame, wherein the machine frame is provided with a spring plate, a clamping base for clamping the spring plate, a straight rod detachably connected with one end of the spring plate and a cam between the clamping base and the straight rod. One end of the machine frame is provided with a sleeve, the straight rod moves axially along the sleeve, the middle of the spring plate is fixed to one end of a clamping iron block, the other end of the clamping iron block is hinged to one end of a connecting rod, the other end of the connecting rod is hinged to the cam, the cam can rotate on the machine frame and the clamping base can be adjusted. The cam spring plate mechanism is simple in structure and good in effect.

The invention relates to a forage grass cutting and smashing integrated device. The device comprises: a base, wherein the base is of a cuboid structure, a mounting plate perpendicular to the base is fixed to the upper portion of the base, a fixed shaft is fixedly mounted on the mounting plate, and a cutter capable of rotating along the fixed shaft is movably arranged on the mounting plate; a swing rod, wherein one end of the swing rod is rotationally mounted on the fixed shaft, and the end, away from the fixed shaft, of the swing rod is connected with the cutter; a power mechanism, which is arranged on the mounting plate and connected with a fan-shaped piece rotationally mounted on the fixed shaft, a meshing structure is arranged between the fan-shaped piece and the swing rod, and the meshing structure can drive the cutter to rotate; a material conveying assembly, which is arranged on the base and connected with the power mechanism, mutual reverse movement between the swing rod and the fan-shaped piece is achieved, and the rotating speed of a cutter is increased through the meshing structure so that better cutting can be conducted.

A gun-type radioactive seed implanter for laryngopharyngeal cancer, comprising a push needle (4), a T-shaped frame (1), a turntable (2) and a conversion rod (3), wherein the bottom end of the conversion rod (3) is connected to the T-shaped frame (1). The bottom end of the vertical shaft of the profile frame (1) is rotatably connected, the transverse beam of the T-shaped frame (1) is provided with a through hole (11), and the side surface of the push pin (4) is provided with a push pin column (41), The push pin column (41) vertically passes through the push pin column track (13) and is connected to the push pin connecting hole (31) at the top of the conversion rod (3), and a conversion column is provided in the middle section of the conversion rod (3). A connecting hole (32), the turntable (2) is rotatably connected with the vertical axis of the T-shaped frame (1), and a conversion column (241) is installed on the other side of the turntable (2), and the conversion column (241) is connected to the transfer column connection hole (32). Not only can the problem of the push needle (4) being pushed too deep accidentally can be avoided, but also the return speed of the push needle (4) is faster than the push speed, and the efficiency is higher.

The invention discloses a self-adaptive adjustment baby hammock, and relates to the technical field of baby hammocks. Each first vertical supporting column is connected with a displacement limiting assembly, a first motor is mounted in the middle of the upper surface of a transverse mounting plate, a transverse rotating shaft rod is rotationally connected to the middle of each transverse supporting column, and a swing assembly is arranged between the tail end of an output shaft of the first motor and one end face of the transverse rotating shaft rod. The first motor is controlled by the controller to operate, the baby hammock is controlled by the controller to swing left and right, manual swing is not needed, and the workload of parents is relieved. The controller can analyze the change of the weight of a baby through the four pressure sensors, then the controller drives a second motor to operate, the height of a sliding block is adjusted, then the height of a first infrared sensor is adjusted, the swing amplitude of the baby hammock is changed, and the baby hammock can follow the change of the weight of the baby in the growth period. The swing amplitude of the baby hammock is automatically adjusted, and the adaptability is high.

The invention relates to a creeping toy cassette mechanism which is controlled by a chip, comprising a shell as well as a motor and a gearing which are arranged inside the shell, wherein, the shell is connected with a corrugated hose which is internally provided with a movable arm fixedly connected on the shell; the movable arm consists of a plurality of short arms which are sequentially articulated with each other; the upper part of the movable arm is provided with a tension spring, and the tail end at the lower part of the movable arm is connected with the gearing by a stayguy; the gearing comprises a crank shaft connected with the stayguy, an eccentric mechanism connected with the crank shaft and a speed changer arranged between the motor and the eccentric mechanism. The creeping toy cassette mechanism can lead the toy to make creeping actions by the cooperation of all the parts, so as to change most swing and walking actions of the original toy cassette mechanism and enrich the actions of the toy; at the same time, the creeping toy cassette mechanism has simple structure and reliable work.

The invention provides a yarn sequin sewing device of a multi-needle sewing machine, and belongs to the technical field of sewing machines. The device solves the problems of low sewing quality and low production efficiency of the conventional sequin sewing device. The yarn sequin sewing device of the multi-needle sewing machine comprises a needle plate positioned on a workbench plate of a frame, a cutter arranged on a machine needle seat and feeding push rods corresponding to machine needles in quantity; a guide mechanism capable of guiding feeding of sequins is arranged on the needle plate; and a mounting seat is fixedly connected to the end face of the frame, the mounting seat is connected with a push rod fixing rack through a rotating shaft, the feeding push rods are connected to the push rod fixing rack and can swing around the joints, and a driving mechanism capable of driving a push rod fixing seat to swing around the axial line of the rotating shaft through a transmission main shaft so that the feeding push rods push the sequins in the guide mechanism out one by one is also arranged on the mounting seat. According to the sequin sewing device, synchronism of the machine needles and the push rods is high, and the yarn sequin sewing quality is improved.

The invention provides a support device for welding and assembling fitness equipment, which relates to the technical field of fitness equipment welding and assembling. The round tube workpiece with the fixed component rotates and rolls, so that the worker does not need to move when welding the workpiece, which is convenient and flexible, and the swing component can drive the welding rod to swing automatically, so that the worker does not need to manually control the swing of the welding torch, which further simplifies the round tube workpiece of fitness equipment. The work flow during welding and assembly greatly reduces the labor intensity of workers, and solves the problem that the existing welding device requires workers to constantly move around the circular tube to weld, which is troublesome, and the need to manually swing the welding torch during welding is extremely labor-intensive. The problem.

The invention relates to the technical field of watch detection, and discloses a waterproof performance detection device for pocket watches, which includes a bottom plate and a bracket, a container is placed above the bottom plate, a movable rod is connected to the bracket, and a hanging rod is connected to the lower end of the movable rod. A pocket watch is connected to the rod, and a collar is sleeved on the outside of the bracelet of the pocket watch. The right side of the collar is connected to a moving rod, and the right end of the moving rod is connected to a connecting sleeve. The connecting sleeve is sleeved in the middle of the arc bow, and the upper end of the arc bow is fixedly connected There is an upper screw block, and the lower end of the arc bow is fixedly connected with a lower screw block, and both the upper screw block and the lower screw sleeve are connected on the rotating shaft. The waterproof performance testing device for pocket watches can change the time that the pocket watch is submerged in water during the movement cycle of moving the rod, and can record and observe the times of pocket watch submersion without deliberate artificial statistics, and has the ability to control the unit time Immersion time, and the advantage of being easy to control the number of immersions.

The invention provides an evaporation type air conditioner with swing padding. The evaporation type air conditioner comprises an air conditioner shell, a swing type padding device is arranged at the inner center of the air conditioner shell and comprises the padding and a swing type mechanical device, the padding is fixed in the swing type mechanical device, a spraying row and a water fender are sequentially arranged above the padding, an exhaust outlet is formed in the top wall, corresponding to the water fender, of the air conditioner shell, a fan is arranged in the exhaust outlet, a water tank is arranged under the padding, an air duct is arranged between the padding and the water tank, and the water tank is connected with the spraying row through a water supply pipe. According to the evaporation type air conditioner with the swing padding, a connecting rod swing mechanical structure and the evaporation cooling padding are combined, swing of the padding in the space is achieved, and the cooling and dust removing effect of a wet curtain is improved.

The invention discloses a function curve drawing instrument for classroom teaching. The function curve drawing instrument comprises a main frame, bases, a rocking rod, a pen placing device, an amplitude adjustment device, a frequency adjustment device, an objective table, a slideway and a sliding plate. When the function curve drawing structure is in use, the rocking rod is rocked manually to transmit power to the frequency adjustment device through a corresponding shaft; the transmission ratio is changed through the frequency adjustment device, and the power is transmitted onto the objective table and the amplitude adjustment device through corresponding shafts, gears and bevel gears; through two corresponding gears on the objective table, the power on the objective table is transmitted onto gear racks under the sliding plate, so as to achieve transversely displacement of a pen in the direction of the gear racks; according to the crank shaft sliding block principle, the power on the amplitude adjustment device is transmitted to the pen placing device, so as to achieve vertical swing of the pen in the direction perpendicular to the gear racks. The function curve drawing instrument adopts a crank shaft sliding block, so that the crank shaft length can be changed when the pen is swung, that is, the swing amplitude of the pen is changed and the oscillation of a function is obtained; through the frequency adjustment device, the transmission ratio between two displacements is changed, that is, the to-and-fro swing speed of the pen can be changed and the frequency of the function can be adjusted.

The invention provides a robot fish and a fishtail working principle thereof, and relates to the field of mechanical fish. The robot fish comprises a fish main body and a fishtail, wherein the fishtail comprises a plurality of first frame bodies which are hinged sequentially to form a fishtail main body; one end of the fishtail main body is hinged to a second frame body serving as a tail fin; the other end of the fishtail main body is hinged to a third frame body; a mounting groove is formed in the third frame body; the robot fish further comprises a connecting part; the middle part of the connecting part is hinged to the third frame body; an adjustable eccentric wheel device which allows the third frame body to swing horizontally in the horizontal direction relative to the connecting part is arranged at one end, extending to the mounting groove, of the connecting part, and the other end of the connecting part is connected to the fish main body; a driver for driving the adjustable eccentric wheel device is arranged in the fish main body. The robot fish has the benefits that complete fishtail-type swinging of the fishtail can be realized, the robot fish can swim freely in water, and swimming of the robot fish can be more real.

The invention provides a feed dog lifting height adjustable mechanism which comprises a main shaft, a feed lifting shaft, a dog frame, a feed dog, a first feed lifting transmission assembly connected between the main shaft and the feed lifting shaft, and a second feed lifting transmission assembly connected between the feed lifting shaft and the dog frame, wherein the first feed lifting transmission assembly comprises a feed lifting eccentric wheel arranged on the main shaft in a sleeving mode, a feed lifting eccentricity adjusting assembly and a feed lifting connecting rod both connected with the main shaft and the feed lifting eccentric wheel, and a feed lifting crank fixed to the feed lifting shaft, one end of the feed lifting connecting rod is rotationally arranged on the periphery of the feed lifting eccentric wheel in a sleeving mode, and the other end of the feed lifting connecting rod is hinged to the feed lifting crank; when the feed lifting height of the feed dog is adjusted, the main shaft is rotated, and feed lifting eccentricity L between a matching center O1 of the feed lifting eccentric wheel and the feed lifting connecting rod and a rotation center O2 of the main shaft is changed through the feed lifting eccentricity adjusting assembly, so that the transmission efficiency between the main shaft and the feed lifting shaft is changed, the feed lifting height of the feed dog is adjusted, and the adaptability of a sewing machine to different sewing materials is greatly enhanced.

The invention discloses a bionic fish propulsion device, which comprises a base plate, the base plate is provided with a deflector plate and a support column, the top of the support column is provided with a concave guide rail block, the concave guide rail block is provided with a slide groove, and the concave clamp rod passes through the The slider is slidably installed in the chute of the concave guide rail block. The concave clamping rod is equipped with an imitation fishtail elastic plate. There is a first V-shaped elastic support plate and a second V-shaped elastic support plate between the two imitation fishtail elastic plates. Two driving devices are installed on the bottom plate. The push rods of the two driving devices are hinged to the corresponding concave clamping rods. . The bionic fish propulsion device of the present invention utilizes the passive staggered propulsion deformation of the intersecting imitation fishtail elastic plates to realize the approximate fishtail swimming posture and can exhibit excellent hydrodynamic characteristics; driven by double imitation water servo motors, multi-frequency can be realized Propulsion, stepless steering.

The invention provides a tooth-lifting mechanism with adjustable height, comprising a main shaft, a tooth-lifting shaft, a tooth frame, a feeding dog, a first tooth-lifting transmission component connected between the main shaft and the tooth-lifting shaft, and a tooth-lifting shaft connected to the tooth-lifting shaft. The second tooth lift transmission assembly, the adjustment drive assembly, and the adjustment operation part between the tooth frame and the tooth frame, the first tooth lift transmission assembly includes a tooth lift eccentric fixed on the main shaft, a first tooth lift link, and a second tooth lift A connecting rod, and a tooth-lifting crank fixed on the tooth-lifting shaft, one end of the first tooth-lifting link is rotatably sleeved on the outer periphery of the tooth-lifting eccentric, the other end is hinged with one end of the second tooth-lifting link, the second The other end of the tooth-lifting link is hinged with the tooth-lifting crank, and the adjustment operation part acts on the first tooth-lifting transmission assembly through the adjustment drive assembly to change the position of the hinge point of the first tooth-lifting link and the second tooth-lifting link, Thereby, the transmission efficiency between the tooth-lifting eccentric wheel and the tooth-lifting shaft is changed, the height of the tooth-lifting is adjusted, and the versatility of the sewing machine is improved.

The invention discloses a function curve drawing instrument for classroom teaching. The function curve drawing instrument comprises a main frame, bases, a rocking rod, a pen placing device, an amplitude adjustment device, a frequency adjustment device, an objective table, a slideway and a sliding plate. When the function curve drawing structure is in use, the rocking rod is rocked manually to transmit power to the frequency adjustment device through a corresponding shaft; the transmission ratio is changed through the frequency adjustment device, and the power is transmitted onto the objective table and the amplitude adjustment device through corresponding shafts, gears and bevel gears; through two corresponding gears on the objective table, the power on the objective table is transmitted onto gear racks under the sliding plate, so as to achieve transversely displacement of a pen in the direction of the gear racks; according to the crank shaft sliding block principle, the power on the amplitude adjustment device is transmitted to the pen placing device, so as to achieve vertical swing of the pen in the direction perpendicular to the gear racks. The function curve drawing instrument adopts a crank shaft sliding block, so that the crank shaft length can be changed when the pen is swung, that is, the swing amplitude of the pen is changed and the oscillation of a function is obtained; through the frequency adjustment device, the transmission ratio between two displacements is changed, that is, the to-and-fro swing speed of the pen can be changed and the frequency of the function can be adjusted.