Chain type arc trace lifting parking equipment

Abstract

The invention discloses chain type arc trace lifting parking equipment, belongs to the field of parking equipment, and mainly solves the problem that a vehicle carrying plate is inclined due to the fact that the deviation of gravity load of a trolley on a left groove beam and a right groove beam of oil cylinder driving type arc trace parking equipment is too large and exceeds the control capacity of a synchronous system. According to the synchronization principle of chain type driving of the left groove beam and the right groove beam, the characteristic that a chain cannot slip under driving of a driving wheel is utilized, then the driving wheel, a guide wheel and a tension wheel are combined to form a triangular motion track line, a straight notch is formed in a 7-shaped driving rod and can do notch motion with a serial pressing shaft, and the serial pressing shaft is fixed to the middle of an arc-shaped plate. One end of the circular chain is fixed at one end of the arch-shaped plate; a triangular track line is arranged at one end of the arch-shaped plate and is wound on the driving path and the tension wheel in sequence; the ascending transmission principle is that when the motor rotates, the speed reduction box, the synchronous transmission shaft, the circular chain driving wheel, the circular chain, the arch-shaped connecting plate, the serial pressing shaft, the annular roller, the 7-shaped driving rod, the groove beam and the two-layer vehicle carrying plate descend, the ascending transmission principle is opposite to the descending transmission principle.

Description

TECHNICAL FIELD

[0001] The patent relates to a method for improving the synchronization capability of two groove beams of an arc trajectory lifting parking equipment driven by a chain, thereby avoiding the use of a driving mode of an oil cylinder type to avoid the tilt of the two-layer vehicle loading plate caused by the synchronization capability of the oil circuit control exceeding the synchronization capability of the oil circuit control due to the gravity difference of the trolley applied to the left and right two groove beams. BACKGROUND

[0002] In the existing arc trajectory lifting parking equipment, the vehicle loading plate is generally moved up and down by relying on the oil cylinder as the power, such as the published application No. CN202011143149.7. The patent discloses that the arc trajectory lifting parking equipment is driven by oil pressure to realize lifting, but the oil cylinder drive requires a relatively complex oil circuit control system to avoid the front and rear tilt of the two-layer vehicle caused by the load deviation of the left and right two groove beams exceeding the synchronization capability of the oil cylinder synchronization control system due to the gravity difference of each trolley or the position of the trolley on the vehicle loading plate being not ideal, thereby causing the two-layer vehicle to slide and affecting the safety of the vehicle.

[0003] In addition, the oil cylinder drive type has the problems of complex oil control system, high cost, high maintenance cost, and easy pollution of the environment.

[0004] Therefore, the chain type arc trajectory lifting equipment can avoid these shortcomings. The advantages of the chain type are simple structure, low cost, no pollution to the environment caused by oil leakage, and no sliding of the trolley caused by the front and rear tilt of the two-layer vehicle loading plate due to the large load deviation of the left and right groove beams, which is more conducive to the promotion of the equipment and the environmental suitability. SUMMARY

[0005] The purpose of the patent is to provide a method for improving the synchronization capability of the left and right two groove beams of the arc trajectory lifting parking equipment, thereby solving the problem that the trolley is tilted due to the position of the two-layer vehicle loading plate and the gravity deviation from the ideal position and the gravity, which exceeds the synchronization capability of the oil control system, causing the height difference of the left and right groove beams during lifting, and causing the displacement of the trolley or the occurrence of the falling accident. At the same time, the patent also has the advantages of low cost, simple structure, low maintenance cost, and small pollution to the environment.

[0006] The patent is characterized in that the circular chain and the driving sprocket are not out of step during transmission (the chain does not slip in the chain nest), so that the movement consistency of the passive part is ensured and the consistency of the slot beam during lifting is improved when the two driving sprockets of the same specification are engaged with the corresponding two chains and the stroke size is not the same. However, the selection of the driving joint position of the circular chain at the position of the 7-shaped driving rod directly affects the stability of the length of the chain trajectory, which will affect the stability of the transmission. Therefore, in order to improve the stability of the chain, the trajectory of the chain is planned as follows: first, ensure that the joint point of the circular chain and the 7-shaped driving rod during transmission cannot always remain unchanged at a certain position, otherwise it will cause the chain to be loose. In order to ensure the stability of the length of the trajectory, a straight slot is provided at the end of the small arm of the 7-shaped driving rod to cooperate with the different positions of the ring roller. The inner hole of the ring roller and the outer diameter of the string compression shaft are concentrically spaced, the string compression shaft is installed with two arc plates at both ends, the upper end of the arc plate is connected with the circular chain through a locking bolt, the other end of the arc plate is connected with the circular chain through a bolt, and the string compression shaft runs linearly along the set trajectory to ensure that the 7-shaped driving rod moves to any position without causing changes in the length of the trajectory.

[0007] The patent is characterized in that: the lifting device of the chain type arc lifting equipment is divided into left and right sets, and the right set is introduced. The right lifting device mainly includes a driving sprocket, a circular chain, an arc plate, a string compression shaft, a ring roller, a 7-shaped driving rod, a slot base, a tension adjusting mechanism, a guide wheel, a pressure bearing plate, a slot beam, a corner support and other auxiliary parts. The common parts of the two sets of lifting devices include a motor, a speed reducer, a transmission shaft, a two-layer vehicle plate and a one-layer vehicle plate.

[0008] The trajectory line is characterized in that: the driving wheel is installed at the corresponding position of the left end of the slot base, the tension adjusting mechanism is installed in the middle of the slot base, and the guide wheel is installed on the guide wheel base. Figure 6 、 Figure 7 The layout is composed of. The trajectory line is drawn based on the mirror image reference surface of the slot base, and the overall shape is a triangle. One end of the triangle is drawn from the center point of the shaft hole of the left end of the arc plate to the tangent point of the tangent part of the driving wheel and the driving wheel, and then to the tangent point of the tension adjusting wheel and the tension wheel, and then to the tangent point of the guide wheel and the guide wheel, and then to the right end of the arc plate.

[0009] The transmission process of the patent is: when the two-layer car plate needs to rise, the motor rotates → the reduction box → the synchronous transmission shaft → the driving wheel → the circular chain → the arch plate → the string compression shaft → the ring roller → the 7-shaped driving rod → the groove beam → the corner support rod → the two-layer car plate. When the two-layer car plate needs to descend, the motor reverses → the reduction box → the synchronous transmission shaft → the driving wheel → the circular chain → the tension wheel → the guide wheel → the arch plate → the string compression shaft → the ring roller → the 7-shaped driving rod → the groove beam → the corner support rod → the two-layer car plate. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 Stereoscopic structure diagram

[0011] Figure 2 Two-layer car plate falling into place simplified diagram

[0012] Figure 3 Simplified diagram of each transmission mechanism

[0013] Figure 4 Single set of chain transmission detailed diagram

[0014] Figure 5 Straight slot transmission and tension transmission mechanism diagram

[0015] Figure 6 Chain motion trajectory line diagram

[0016] Figure 7 Groove-shaped base diagram

[0017] Figure 8 Upper and lower layer effect diagram

[0018] Meaning of reference signs in the drawings:

[0019] 1-motor, 2-reduction box, 3-synchronous transmission shaft, 4-bearing seat, 5-driving wheel, 6-circular chain, 7-tension adjusting wheel, 8-guide wheel, 9-string compression shaft, 10-groove-shaped base, 11-7-shaped driving rod, 12-corner support rod, 13-groove beam, 14-arch plate, 15-limiting pad, 16-pressure plate, 17-bearing, 18-ring roller, 19-tension adjusting shaft, 20-tension screw, 21-locking nut, 22-straight slot, 23-guide wheel base, 24-locking bolt, 25-7-shaped driving rod connecting bolt, 26-guide wheel bolt, 27-left lifting device, 28-right lifting device, 30-motion trajectory line, 30.1-upper cut point of driving wheel, 30.2-lower cut point of driving wheel, 30.3-upper cut point of guide wheel, 30.4-lower cut point of guide wheel, 30.5-right cut point of tension wheel, 30.6-lower cut point of tension wheel, 30.7-tension wheel degree circle arc line, 30.8-driving wheel degree circle arc line, 30.9-guide wheel degree circle arc line, etc. (as Figures 1-8 ). DETAILED DESCRIPTION

[0020] The patent will be further described in combination with the embodiments below.

[0021] In the description of the patent, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the patent technology.

[0022] In the description of the patent, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features. In the description of the patent technology, mirror installation: take a certain reference surface as the reference, where the installation mode of left and right parts is the same. In the description of the patent, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the patent in combination with the specific content of the technical solution.

[0023] As Figures 1-8 shown is a schematic view of the chain type arc parking equipment from different angles, wherein the left lifting device 27 and the right lifting device 28 of the lifting device (such as Figure 8 ) are exactly the same for the convenience of understanding Figure 2 , Figure 4 , Figure 5 , Figure 6Take the right lifting device as an example to explain, in which two sets of lifting devices share a motor 1, a reduction box 2, and a synchronous transmission shaft 3. A single set of lifting devices includes: bearing seat 4, driving wheel 5, circular chain 6, tension wheel 7, guide wheel 8, string pressure shaft 9, groove base 10, groove base mirror reference surface 10.1, step 10.2, triangular boss 10.3, cross plate 10.4, tension mechanism bracket 10.5, guide wheel bracket 10.6, corner support rod mounting hole 10.7, 7-type drive rod 11, corner support rod 12, groove beam 13, bow plate 14, limit pad 15, pressure plate 16, rotation pressure bearing 17, annular roller 18, tension shaft 19, tension Force screw 20, locking nut 21, straight slot 22, guide wheel base 10.6, locking bolt 24, 7-shaped drive rod connecting bolt 25, driving wheel upper tangent point 30.1, guide wheel upper tangent point 30.2, driving wheel lower tangent point 30.3, guide wheel lower tangent point 30.4, tension wheel right tangent point 30.5 - tension wheel lower tangent point 30.6, tension indexing arc line 30.7, driving wheel indexing arc line 30.8, guide wheel indexing arc line 30.9, motion trajectory line 30, bow plate lower end pin hole 40, bow plate upper end pin hole 41.

[0024] Round chain 6 according to Figure 6 The trajectory line 30 is assembled, and the overall shape of the trajectory line 30 is a triangle. One end of the circular chain 6 is first pulled out from the lower end axle pin hole 40 of the two arch plates 14 (the two arch plates are symmetrically assembled with the mirror surface 10.1 as the reference) through bolt compression and pulled toward the circular driving wheel 5. Part of the chain is wrapped around the chain nest of the driving wheel and meshed with it, thereby being driven by the driving wheel 5. Then, it is pulled toward the tension wheel 7 to mesh with it, and then pulled toward the guide wheel 8 to mesh with it. The other end of the circular chain 6 is fixed to the upper end axle pin hole 41 of the two arch plates 14 by the locking bolt 24.

[0025] like Figure 6 The trajectory line 30 is drawn with the mirror surface of the groove base 10 as the reference surface 10.1 (as shown in FIG. Figure 7 ), first lead out from the center point of the lower end pin hole 40 of the arch plate 14 (the two arch plates are assembled in a warp direction) and then become tangent to the upper tangent point 30.1 of the pitch circle 30.8 of the driving wheel 5. After a portion of the track line 30 coincides with the pitch circle 30.8, it is led out from the tangent point 30.3 to the tension wheel 7. The straight line formed is tangent to the lower tangent point 30.6 of the pitch circle 30.7 of the tension wheel 7. After a portion of the track line 30 coincides with the pitch circle 30.7, it is led out from the tangent point 30.5 to the tangent point 30.4 of the pitch circle 30.9 of the guide wheel 8. A portion of the track line 30 coincides with the pitch circle 30.9, lead out from the tangent point 30.2, and then become connected to the midpoint of the upper end pin hole 41 of the arch plate 14.

[0026] like Figures 6-7The technical features of the groove-shaped base 10 are that a pair of steps 10.2 are provided at the left end of the groove-shaped base 10 for installing and positioning the bearing seat 4, and a higher protruding triangular step 10.3 is provided at the right side of the step for clamping the 7-shaped drive rod 11, which is also used for installing the limiting block 15. A pin hole is provided at the lower right section of the step for installing the 7-shaped drive rod 11, and a tension wheel support 10.5 is provided in sequence to the right section. A straight slot is provided at the corresponding position of the step for installing the tension adjusting shaft 19. A horizontal plate 10.4 is welded at the left end of the step, and a hole is provided at the corresponding position of the two ends of the horizontal plate for clamping the tension adjusting screw rod 20. A higher protruding guide wheel support 10.6 is provided at the right end of the step. The support is provided with a pair of concentric and same-diameter mounting holes for installing the guide wheel bolt 26. A pair of concentric and same-diameter pin holes are provided at the right end of the groove-shaped base for installing the corner support rod 12.

[0027] As shown in Figures 4-5 The pressure plate 16 described in the patent is in the shape of an inverted trapezoid, and a set of lifting devices are each equipped with two, and the two plates are installed in mirror symmetry with the reference mirror 10.1 of the groove-shaped base 10. One end of the pressure plate 16 is installed at the upper end of the guide wheel support 10.6, and the other end is installed on the higher protruding triangular step 10.3 of the groove-shaped base 10. The upper surface of the pressure plate 16 is in parallel relationship with the connecting line of 30.1 and 31.2 on the track line 30. The function of the pressure plate is to reduce the shock on the chain 6 caused by external interference during the operation of the chain 6, thereby ensuring the stable lifting of the two-layer vehicle plate. In addition, it can transfer the gravity exerted by the 7-shaped drive rod 11 on the string pressure shaft 9, thereby increasing the tension at both ends of the circular chain 6 and prolonging the service life of the chain.

[0028] As shown in Figures 4-5 The tension adjusting mechanism of the chain type arc track parking equipment mainly consists of the tension adjusting base 10.5 (in the middle section of the groove-shaped base 10), the tension wheel 7, the tension shaft 19, the tension screw rod 20, and the tension nut 21. The tension wheel 7 is an idler with a bearing inside to increase the stability of the transmission system. The inner diameter of the bearing of the tension wheel 7 is concentrically fitted with the tension shaft 19. The two ends of the tension shaft 19 are provided with inner tooth holes corresponding to the tension screw rod 20. The screw head of the tension screw rod 20 is installed at the left end of the tension adjusting base. The axis of the tension screw rod 20 is concentrically fitted with the two holes of the horizontal plate on the tension base. The tension nut 21 is concentrically fitted with the tension screw rod 20. When the tension nut is tightened to the left, the tension screw rod 20 can be locked to prevent the position of the tension wheel 7 from being unstable. The principle of adjusting the tension of the circular whole chain 5 is that when the tension screw rod 20 is selected, the position of the tension shaft changes, thereby changing the distance between the tension wheel 7 and the driving wheel 5, and changing the tension of the circular chain.

[0029] As shown in Figures 3-4As shown, the 7-shaped drive rod of the chain type arc track parking equipment is characterized in that: not only the overall shape is 7-shaped, but also a straight slot 22 is opened at the corresponding position of one end of the groove-shaped base 10 to ensure that the connecting shaft 9 moves along the connecting line of the tangent point 30.1 on the driving wheel indexing circle and the tangent point 30.2 on the guide wheel indexing circle, and the straight slot 22 is in a straight slot matching relationship with the ring roller 18, and the outer diameter surface of the ring roller 18 is in a straight slot transmission with the surface of the straight slot 22.

[0030] As shown Figures 3-4 The matching relationship between the pressure plate 16, the bearing 17, the connecting shaft 9, the arc plate 14, the ring roller 18 and the straight slot 22 is that the outer diameter surface of the bearing 17 is tangent to the upper surface of the pressure plate 16, one bearing is installed at each end of the connecting shaft 9 to be symmetrically installed with the mirror image 10.1 reference, the connecting shaft 9 is sleeved with a ring roller 18 at the middle segment, the matching between them is gap matching, the ring roller 18 can freely rotate on the connecting shaft 9, the outer diameter surface of the ring roller 18 is in transmission with the surface of the straight slot 22, and the ring roller 18 mainly plays a role in reducing friction and wear during transmission to improve the operation efficiency and service life of the equipment.

[0031] As shown Figures 4-5 The arc plate 14 described in the patent has an overall shape of an arc, one pin hole is opened at each end of the arc plate 14 for passing through a bolt to fix the circular chain 6 for use, and the arc plate 14 is in pairs to be symmetrically installed with the mirror image 10.1 reference as shown Figures 4-5 The two arc plates 14 and the 7-shaped drive rod maintain a proper gap to ensure that the arc plate 14 will not collide with them during operation.

[0032] The transmission process of the chain type arc track parking equipment is as follows:

[0033] After the vehicle is parked on the second layer of the vehicle loading plate, the motor 1 rotates → the reduction box 2 (reduces and amplifies the torque) → the synchronous transmission shaft 3 (ensures that the two driving wheels are synchronous) → the driving wheel 5 (ensures that there is no slip when meshing and transmitting with the chain) → the circular chain 6 → the arc plate 14 → the connecting shaft 9 → the ring roller 18 → the straight slot 22 (on the 7-shaped drive rod) → the groove beam 13 → the corner support rod 12 → the second layer of the vehicle loading plate rises.

[0034] The descending process of the second layer of the vehicle loading plate is: the motor 1 (opposite to the rising direction) → the synchronous transmission shaft 3 (ensures that the two driving wheels are synchronous) → the driving wheel 5 (ensures that there is no slip when meshing and transmitting with the chain) → the circular chain 6 → the tension wheel 7 → the guide wheel 8 → the arc plate 14 → the connecting shaft 9 → the 7-shaped drive rod (transmitted by the straight slot) → the groove beam 13 (the second layer of the vehicle loading plate rises) → the corner support rod 12 rises.

[0035] In order to improve the safety of the patent equipment, the motor 1 has a power-off brake mechanism; the reduction box 2 belongs to a worm and gear reduction box, and since the reduction is relatively high, the pressure angle of the worm and gear is also relatively small (the pressure angle is <3.5°-4.5°, the worm has a self-locking function), and when the power is suddenly cut off and the emergency stop is performed, the two-layer load plate is easily driven by the 7-shaped driving rod 11, the ring-shaped roller 18, the stringed shaft 9, the arc-shaped plate 14, the circular chain 6, the driving wheel 5, the same driving shaft 3, the reduction box 2, and the rotation is performed, when the worm of the reduction box 2 transmits the power to the worm rod, since the pressure angle is too small, it is difficult to drive the worm rod to rotate, and the reverse braking effect is achieved (the internal mechanism of the reduction box 2 is not shown in the figure).

[0036] The slot-shaped base 10, the 7-shaped driving rod 11, the slot-shaped beam 13, and the corner support rod 12 of the patent have a connection relationship between the joints, which is similar to the disclosed arc track lifting parking equipment and is still a parallelogram relationship.

[0037] The above-mentioned embodiments of the patent are not a limitation on the protection scope of the patent, and any other modifications, replacements, or changes to the above-mentioned structure of the patent according to the ordinary technical knowledge and common methods in the field, without departing from the above-mentioned basic technical idea of the patent, should fall within the protection scope of the patent.

Claims

1. A chain type arc lift parking equipment parts and combination features in: including motor, gearbox, synchronous transmission shaft, bearing seat, drive wheel, round chain, tension wheel, guide wheel, string pressure shaft, groove base, 7-shaped drive rod, corner support rod, groove beam, arch plate, limit block, pressure plate, pressure bearing, ring roller, tension shaft, tension screw, tension nut, straight slot, guide wheel base, chain fixed shaft pin, drive rod link bolt, guide wheel link bolt, two-layer load plate, etc. Composition, wherein the tension support, tension wheel, tension shaft, tension screw and tension nut are tension adjusting mechanism, the combination relationship of the whole transmission part is: the motor is connected with the gearbox, the synchronous transmission shaft is driven to rotate after the reduction and torque amplification of the gearbox, the both ends of the synchronous transmission shaft are provided with drive wheels, the inner hole diameter of the drive wheel is concentrically matched with the synchronous transmission shaft, the bearing seat is concentrically matched with the synchronous transmission shaft, the bearing seat is installed on a step at the tail end of the groove base, the drive wheel is hung with the round chain, one end of the round chain is fixed on the two arch plates by positioning bolts, the chain is wound on the drive wheel after being pulled out from the two arch plates, then the chain is wound on the tension wheel after being pulled out again, then the chain is wound on the guide wheel after being pulled out again, and the other end of the round chain is fixed on the other end of the two arch plates through bolts, the arch plate is provided with a hole in the middle, a string pressure shaft pin is penetrated in the middle of the hole, and a ring roller is penetrated in the hole, the ring roller can freely move in the straight slot of the 7-shaped drive rod, the both ends of the string pressure shaft are provided with two pressure bearings, the outer surface of the pressure bearing is pressed on the upper surface of the pressure plate, one end of the pressure plate is installed on the groove base near the drive wheel, the other end is installed on the left upper end of the guide wheel base, the upper surface of the pressure plate is parallel to the center line of the drive wheel and the guide wheel, and is tangent to the outer diameter surface of the pressure bearing; The feature is that the movement track of the chain runs around a triangular track.

2. The synchronization principle of the two-slot beams according to feature 1 lies in that the chain-type arc parking equipment will not produce slip when the chain and the driving wheel engage in transmission, and the lengths of the two chains will not change no matter how large the load difference of the chain is, as long as the rotating speeds of the two driving wheels are the same, thus ensuring the consistency of the stroke of the pushing and pulling device. The invention adds chain driving wheels, tension adjusting devices, guide wheels, annular chains and pressure plates on the left and right two sets of arc parking equipment respectively on the groove-shaped base, and a straight slot corresponding to the movement of the annular roller is opened on the 7-shaped driving rod. The synchronization principle of the two sets of lifting devices is that when the motor rotates, the torque is amplified after being reduced by the reduction box, thus driving the synchronous transmission shaft to rotate, which in turn drives the driving wheels at both ends to rotate. When rising, the transmission sequence is: motor rotation → reduction box → synchronous transmission shaft → driving wheel → circular chain → bow plate → string pressure shaft → annular roller → 7-shaped driving rod → slot beam → corner support rod → second layer of vehicle plate. When the second layer of vehicle plate is descending, the transmission sequence is: motor rotation in the opposite direction of the rising direction → reduction box → synchronous transmission shaft → driving shaft → tension wheel → guide wheel → bow plate → string pressure shaft → annular roller → 7-shaped driving rod → slot beam → corner support rod → second layer of vehicle plate. The mechanism is characterized in that: The same name components of the left lifting device and the right lifting device of the two sets of lifting devices of the parking equipment are the same, the two drive wheels are driven by the same speed transmission shaft, so that the two groove beams can be parallel and synchronous regardless of the load difference of the two 7-shaped drive rods.

3. According to feature 1, the 7-shaped drive rod is characterized in that: the groove base is connected with a straight slot at one end for matching, the ring roller, the string pressure shaft, the arch plate and the round chain move linearly, so that the chain can not be too loose or too tight when moving to any position.

4. According to feature 1, the groove base is characterized in that: it is designed to be symmetrical with respect to a mirror surface, the left end is provided with a step for installing the drive wheel base, the right end is provided with a triangular boss which can clamp the limit block to limit the upper limit position of the 7-shaped drive rod, and the boss can also clamp the 7-shaped drive rod to prevent it from tilting, the middle section is provided with a support for installing the tension wheel, the tension screw and the tension shaft for adjusting the tension of the chain, the right side of the tension adjusting support is provided with a high guide wheel support for installing the guide wheel, the center line of the guide wheel and the drive wheel is parallel to the movement track, and the right end of the groove base is provided with a mounting hole for installing the corner support rod.

5. According to the feature 1, the circular chain can also be a roller chain, a toothed chain, a plate chain, a synchronous belt, etc. The driving wheel, the tension wheel and the guide wheel are transformed according to the type of chain.

6. According to the feature 1, the motor has a brake mechanism when power is off. The reduction box is a worm gear reduction box, which has the characteristics of good brake effect. When the power is suddenly cut off, it is difficult for the worm to drive the worm gear to rotate due to gravity (because the pressure angle of the worm and the worm gear is small).

7. According to the feature 1, the overall shape is a triangle. One of the longer straight lines of the trajectory is the same as the line connecting the tangent point on the driving wheel's division circle and the tangent point on the guide wheel's division circle. The string compression shaft will move along this straight line during the movement. In this way, no matter where the string compression shaft moves, it will not cause the length of the chain to change. The trajectory of the circular chain is also connected by the lower tangent point of the driving wheel's division circle and the lower tangent point of the tension wheel's division circle. The other trajectory straight line is also connected by the right tangent point of the tension wheel's division circle and the lower tangent point of the guide wheel's division circle.

8. According to the feature 1, one end of the circular chain is installed on the lower end of the arc-shaped plate through a shaft pin. After being drawn downward, part of the chain is wound around the driving wheel's groove, then drawn upward and wound around the tension wheel. After passing through the tension wheel, the chain is drawn downward and left to the other end of the arc-shaped plate, which is fixed by a bolt. In this way, a closed-loop trajectory is formed.

9. According to the feature 1, the tension adjusting mechanism is characterized in that the tension shaft has inner threaded holes corresponding to the tension screw at both ends. The holes are matched with the outer teeth of the tension screw. The screw head of the tension screw is installed on one side of the horizontal plate and is matched with the two through holes of the horizontal plate. Rotating the screw can change the length of the trajectory and thus change the tightness of the chain. The locking nut can lock the tension screw to prevent it from loosening.

10. According to the feature 1, the transmission shaft can also be indirectly connected between the output shaft of the reduction box and the driving wheel. That is, after the output of the reduction box, two shafts can be connected, each connected to a driving wheel. The intermediate part can also be connected by a universal joint, which can reduce the difficulty of installation.

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