Central control electric dolly with buffering and damping functions

Abstract

The application discloses a central control electric trolley with a buffering and damping function, which comprises a central control trolley main body, wherein the central control trolley main body comprises an electric wheel part and a buffering and damping part, and the buffering and damping part is installed at the rear side of the electric wheel part. The electric wheel part can identify the slope on the road in front, and when a slope with a certain angle is encountered, the electric wheel part identifies the slope, so that the electric wheel part can automatically rotate to provide power assistance for the operator, so that the operator pushing the trolley can easily push the trolley onto the slope, save the operating force of the operator, improve the operability, and be very convenient and labor-saving. The buffering and damping part is installed at the rear side of the electric wheel part, has the buffering and damping function, avoids the phenomenon that the equipment shakes and bounces after over-buffering, and improves the experience and comfort of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of central control wheels, and more particularly to a central control electric caster with a buffering and damping function. BACKGROUND

[0002] Traditional caster types can be divided into universal casters, directional casters, universal casters with brakes, and central control casters. The universal caster allows 360-degree rotation; the directional caster does not have a rotating structure and cannot rotate; and the two types of casters are usually used together, such as the structure of a handcart, which has two directional casters in front and two universal casters near the pushing handle. The universal caster with brake allows 360-degree rotation and can be controlled to start and stop by the brake. The central control caster is braked by rotating the hexagonal hole on the central control lever. However, the traditional central control caster design does not have a buffering and damping function, which causes the device to shake and vibrate when it passes through a buffer, reducing the experience and comfort of the device. Therefore, it is necessary to propose a central control electric caster with a buffering and damping function to at least partially solve the problems existing in the prior art. SUMMARY

[0003] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0004] To at least partially solve the above problems, the present application provides a central control electric caster with a buffering and damping function, comprising: a central control caster body, the central control caster body comprising an electric wheel part and a buffering and damping part, the buffering and damping part being arranged at the rear side of the electric wheel part.

[0005] According to the central control electric caster with a buffering and damping function of the present application, the electric wheel part comprises a drive wheel, a drive control part, and a slope recognition module, the drive control part and the slope recognition module are arranged in the drive wheel, and the buffering and damping part is arranged at the rear side of the drive wheel.

[0006] According to the central control electric caster with a buffering and damping function of the present application, the drive wheel comprises two wheel bodies and a bracket, the bracket comprises a caster support, the wheel bodies are arranged in two and located on both sides of the caster support; the drive control part comprises a drive part and a control module, the drive part comprises a motor and two couplings, the motor is arranged horizontally in the caster support, and the motor is connected with the wheel bodies through the couplings; the slope recognition module and the motor are electrically connected with the control module, respectively.

[0007] The drive part of the central control electric caster with buffering and damping functions further comprises a transverse bearing arranged in the caster support, and the coupling is arranged in the transverse bearing.

[0008] The inner side of the wheel body is provided with a connecting shaft, the connecting shaft is connected with the output shaft through the coupling, and the outer side of the wheel body is provided with a dustproof cover.

[0009] The two slope identification modules are arranged in the first identification hole and the second identification hole respectively, and the slope identification module is one of a laser radar and a camera.

[0010] The rear end of the support is provided with a supporting cylinder, the buffering and damping part is arranged in the supporting cylinder, the buffering and damping part comprises a directional brake part, a vertical stop shaft and a cam, the directional brake part is arranged in a directional groove in the support, the vertical stop shaft is provided with a stop shaft spring and is arranged in the supporting cylinder through a fixing piece, the fixing piece is arranged at the upper end of the supporting cylinder, the lower end of the vertical stop shaft extends into the directional brake part and is connected with the directional brake part, and the cam is arranged in the upper end of the fixing piece and is used for driving the vertical stop shaft.

[0011] The buffering and damping part further comprises a longitudinal connecting shaft, a first bearing and a second bearing, the supporting cylinder is provided with a stepped hole, the longitudinal connecting shaft is arranged in the stepped hole, the vertical stop shaft is arranged in the longitudinal connecting shaft, the longitudinal connecting shaft is provided with a stepped ring, the stepped ring is arranged in the stepped hole through the first bearing, and the second bearing is arranged on the longitudinal connecting shaft and below the stepped ring.

[0012] The supporting cylinder is provided with a buffering outer circumferential groove, the buffering outer circumferential groove is located at the outer circumferences of the stepped hole, the buffering outer circumferential groove is provided with a buffering spring, the fixing piece is inserted into the buffering outer circumferential groove and abuts against the buffering spring, the fixing piece is provided with a screw sleeve, and the screw sleeve is screwed with the upper end of the supporting cylinder.

[0013] The fixed part comprises a bearing gland, a top shaft plate, a left shaft sleeve, a clasp spring and a right shaft sleeve, the bearing gland is sleeved on the vertical shaft and corresponds to the buffer outer circumferential groove, the left shaft sleeve and the right shaft sleeve are arranged at the upper end of the bearing gland, the top shaft plate is arranged between the left shaft sleeve and the right shaft sleeve through the clasp spring, and the cam is arranged in the left shaft sleeve and the right shaft sleeve.

[0014] Compared with the prior art, the present application has at least the following beneficial effects:

[0015] The present application provides a central control electric trolley with a buffer damping function, which comprises a central control trolley body, the central control trolley body comprises an electric wheel part and a buffer damping part, the buffer damping part is installed at the rear side of the electric wheel part, here the electric wheel part can identify the slope on the road in front, when a slope with a certain angle is encountered, the electric wheel part identifies the slope, so that the electric wheel part can rotate by itself to provide power for the operator, so that the operator pushing the trolley can easily push the trolley to the slope, saving the operating force of the operator, improving the operability, and being very convenient and labor-saving. The buffer damping part is installed at the rear side of the electric wheel part, which plays a buffer damping function, avoids the phenomenon of shaking and bumping of the equipment after over-buffering, and improves the experience and comfort of the equipment.

[0016] The central control electric trolley with a buffer damping function of the present application, other advantages, objects and features of the present application will be embodied in part through the following description, and part will be understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with embodiments of the present application, for explaining the present application, and do not constitute a limitation on the present application. In the drawings:

[0018] Figure 1 The present application is a structural schematic diagram.

[0019] Figure 2 The present application is a structural schematic diagram of the control module.

[0020] Figure 3 The present application is a structural schematic diagram of the internal structure.

[0021] Figure 4 The present application is a structural schematic diagram of the support adjusting part.

[0022] Figure 5 The present application is a partial structural schematic diagram of the driving part.

[0023] Figure 6 It is a structural schematic diagram of the support in the application.

[0024] Figure 7 It is a structural schematic diagram of the bearing gland in the application. DETAILED DESCRIPTION

[0025] The application will be further described in conjunction with the accompanying drawings and examples, so that those skilled in the art can implement the application according to the description.

[0026] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0027] As Figures 1-7 shown, the application provides a central control electric trolley with buffering and damping functions, comprising: a central control trolley body 100, the central control trolley body 100 comprising an electric wheel part and a buffering and damping part, the buffering and damping part being arranged at the rear side of the electric wheel part.

[0028] The working principle and beneficial effects of the above technical solution are as follows: the application provides a central control electric trolley with buffering and damping functions, which comprises a central control trolley body 100, wherein the central control trolley body 100 comprises an electric wheel part and a buffering and damping part, and the buffering and damping part is installed at the rear side of the electric wheel part. Here, the electric wheel part can identify the slope in front of the road, and when a slope with a certain angle is encountered, the electric wheel part identifies the slope, so that the electric wheel part can rotate by itself to provide assistance to the operator, so that the operator pushing the trolley can easily push the trolley onto the slope, saving the operator's operating force and improving the operability, and it is very convenient and labor-saving. The buffering and damping part is installed at the rear side of the electric wheel part, which plays a buffering and damping function, avoids the phenomenon of shaking and jolting of the equipment after over-buffering, and improves the experience and comfort of the equipment.

[0029] In one embodiment, the electric wheel part comprises a driving wheel, a driving control part and a slope identification module 5, the driving control part and the slope identification module 5 being arranged in the driving wheel, and the buffering and damping part being arranged at the rear side of the driving wheel.

[0030] The working principle and beneficial effects of the above technical solution are as follows: the structure of the electric wheel in the embodiment includes a driving wheel, a driving control part and a slope identification module 5, the driving control part and the slope identification module 5 are installed in the driving wheel, and the buffer damping part is installed at the rear side of the driving wheel; when the trolley with the central control electric trolley is running, the slope in front of the road can be identified by the slope identification module 5, when a slope with a certain angle is encountered, the slope identification module 5 identifies the slope, so that the driving control part provides power to the driving wheel, so that the operator pushing the trolley can easily push the trolley onto the slope, saving the operating force of the operator, improving the operability, and being very convenient and labor-saving. The buffer damping part is installed at the rear side of the driving wheel, which plays a buffer damping function, avoids the phenomenon of shaking and bumping of the equipment after over-buffering, and improves the experience and comfort of the equipment.

[0031] In one embodiment, the driving wheel includes two wheel bodies 1, a support 2, the support 2 includes a trolley support 21, the wheel body 1 is provided with two and is located on both sides of the trolley support 21; the driving control part includes a driving part 3, a control module 4, the driving part 3 includes a motor 31, two couplings 32, the motor 31 is transversely arranged in the trolley support 21, and the motor 31 is connected with the wheel body 1 through the coupling 32. The slope identification module 5 and the motor 31 are electrically connected with the control module 4 respectively.

[0032] The working principle and beneficial effects of the above technical solution are as follows: the structure of the driving wheel and the driving control part in the embodiment, the driving wheel includes two wheel bodies 1 and a support 2, and the driving control part includes a driving part 3 and a control module 4. The support 2 includes a trolley support 21, which serves as a support component of the entire central control electric trolley. The driving part 3 is installed in the trolley support 21, which provides a support space for the driving part 3. The driving part 3 includes a motor 31 and two couplings 32. Since the wheel body 1 is designed with two, the motor 31 is transversely installed in the trolley support 21. The motor 31 has two output shafts 311. The output shaft 311 is connected with the wheel body 1 through the coupling 32. Therefore, when the slope identification module 5 identifies a slope, it sends a signal to the control module 4. The control module 4 starts the motor 31. The output shaft 311 of the motor 31 drives the wheel body 1 to rotate, providing power to the wheel body 1, so that the operator can easily push the trolley over the slope. The control module 4 has a speed regulation module, which can adjust the speed of the motor 31, so that the central control trolley main body 100 can provide different speeds for different angles of slope. It should be noted that the control module 4 and the speed regulation module are existing components known to those skilled in the art, and the specific structure will not be described here.

[0033] In one embodiment, the driving part 3 further comprises a transverse bearing 33, the transverse bearing 33 is arranged in the caster support 21, and the shaft coupling 32 is arranged in the transverse bearing 33.

[0034] The working principle and beneficial effects of the above technical solution: In this embodiment, the driving part 3 further comprises a transverse bearing 33, which is installed in the caster support 21, and the shaft coupling 32 is arranged in the transverse bearing 33, so when the output shaft 311 of the motor 31 drives the wheel body 1 to rotate through the shaft coupling 32, the shaft coupling 32 rotates in the transverse bearing 33, which makes the rotation of the shaft coupling 32 more stable, and avoids the friction between the shaft coupling 32 and the caster support 21 to hinder the output of the motor 31, and improves the working efficiency of the motor 31.

[0035] In one embodiment, the inner side of the wheel body 1 is provided with a connecting shaft 11, the connecting shaft 11 is connected with the output shaft 311 through the shaft coupling 32, and the outer side of the wheel body 1 is provided with a dust cover 12.

[0036] The working principle and beneficial effects of the above technical solution: In this embodiment, the specific structure of the wheel body 1 is provided, and the connecting shaft 11 is installed on the inner side of the wheel body 1 of the structure, and the connecting shaft 11 is connected with the output shaft 311 through the shaft coupling 32, and the connection between the shaft coupling 32 and the wheel body 1 is realized through the connecting shaft 11; At the same time, the dust cover 12 is installed on the outer side of the wheel body 1, which not only plays a dustproof role, but also can increase the beauty.

[0037] In one embodiment, the slope recognition module 5 is provided with two, the caster support 21 is respectively provided with a first recognition hole 211 and a second recognition hole 212, and the two slope recognition modules 5 are respectively arranged in the first recognition hole 211 and the second recognition hole 212, and the slope recognition module 5 is designed as one of laser radar and camera.

[0038] The working principle and beneficial effects of the above technical solution: In this embodiment, the slope recognition module 5 is provided with two, and the first recognition hole 211 and the second recognition hole 212 are respectively provided on the caster support 21, and the first recognition hole 211 and the second recognition hole 212 are respectively arranged in the first recognition hole 211 and the second recognition hole 212, and the slope recognition module 5 can be designed as one of laser radar and camera. In this way, the two slope recognition modules 5 can recognize the slope before and after pushing, and also reduce the difficulty of the operator to change the direction of pushing.

[0039] In one embodiment, the rear end of the support 2 is provided with a support cylinder 22, the buffer damping part 6 is arranged in the support cylinder 22, the buffer damping part 6 comprises a directional brake part 601, a vertical stop shaft 602 and a cam 603, the directional brake part 601 is arranged in a directional groove 604 inside the support 2, the vertical stop shaft 602 is provided with a stop shaft spring 605 and is arranged in the support cylinder 22 through a fixing part 7, the fixing part 7 is arranged at the upper end of the support cylinder 22, the lower end of the vertical stop shaft 602 extends into the directional brake part 601 and is connected with the directional brake part 601, and the cam 603 is arranged in the upper end of the fixing part 7 and is used to drive the vertical stop shaft 602.

[0040] The working principle and beneficial effects of the above technical solution are as follows: In the embodiment, the rear end of the support 2 has the support cylinder 22, and the support adjusting part 6 is arranged in the support cylinder 22. The support adjusting part 6 comprises the directional brake part 601, the vertical stop shaft 602 and the cam 603. Specifically, the directional brake part 601 is arranged in the directional groove 604 inside the support 2, the vertical stop shaft 602 is provided with the stop shaft spring 605 and is arranged in the support cylinder 22 through the fixing part 7, the fixing part 7 is arranged at the upper end of the support cylinder 22, the lower end of the vertical stop shaft 602 extends into the directional brake part 601 and is connected with the directional brake part 601, and the cam 603 is arranged in the upper end of the fixing part 7. Therefore, when the operator adjusts the cam 603 through the foot pedal (not shown) of the trolley, the cam 603 drives the vertical stop shaft 602, the vertical stop shaft 602 adjusts the directional brake part 601, the directional brake part 601 fixes the vertical stop shaft 602, the rotation of the vertical stop shaft 602 is prevented, and the central control wheel body 100 is positioned and can only move along a straight line. The stop shaft spring 605 can provide support for the vertical stop shaft 602 and facilitate the movement of the vertical stop shaft 602.

[0041] In one embodiment, the buffer damping part 6 further comprises a longitudinal connecting shaft 606, a first bearing 607 and a second bearing 608. The support cylinder 22 is provided with a stepped hole 221, the longitudinal connecting shaft 606 is arranged in the stepped hole 221, the vertical stop shaft 602 is arranged in the longitudinal connecting shaft 606, the longitudinal connecting shaft 606 has a stepped ring 609, the stepped ring 609 is arranged in the stepped hole 221 through the first bearing 607, and the second bearing 608 is arranged on the longitudinal connecting shaft 606 and below the stepped ring 609.

[0042] The working principle and beneficial effects of the above technical solution are: in the support adjusting part 6, a longitudinal connecting shaft 606, a first bearing 607, a second bearing 608 and the like are further provided, a stepped hole 221 is formed in the support cylinder 22, the longitudinal connecting shaft 606 is installed in the stepped hole 221, the vertical stop shaft 602 is arranged in the longitudinal connecting shaft 606, the longitudinal connecting shaft 606 is provided with a stepped ring 609, the stepped ring 609 is installed in the stepped hole 221 through the first bearing 607, and the second bearing 608 is sleeved on the longitudinal connecting shaft 606 and located below the stepped ring 609. The longitudinal connecting shaft 606 provides a mounting space for the vertical stop shaft 602, and the first bearing 607 and the second bearing 608 facilitate the rotation of the whole central control wheel body 100, so as to facilitate the universal rotation of the central control wheel body 100.

[0043] In one embodiment, a buffer outer circumferential groove 222 is arranged in the support cylinder 22, the buffer outer circumferential groove 222 is located at the outer periphery of the stepped hole 221, a buffer spring 223 is arranged in the buffer outer circumferential groove 222, the fixing part 7 is inserted into the buffer outer circumferential groove 222 and abuts against the buffer spring 223, and a screw sleeve 700 is arranged on the fixing part 7 and screwed with the upper end of the support cylinder 22.

[0044] The working principle and beneficial effects of the above technical solution are: in the support adjusting part 6, a buffer outer circumferential groove 222 is arranged in the support cylinder 22, the buffer outer circumferential groove 222 is located at the outer periphery of the stepped hole 221, a buffer spring 223 is arranged in the buffer outer circumferential groove 222, the fixing part 7 is inserted into the buffer outer circumferential groove 222 and abuts against the buffer spring 223, and a screw sleeve 700 is arranged on the fixing part 7 and screwed with the upper end of the support cylinder 22.

[0045] In one embodiment, the fixing part 7 includes a bearing gland 701, a top shaft plate 702, a left shaft sleeve 703, a clasp spring 704 and a right shaft sleeve 705, the bearing gland 701 is sleeved on the vertical stop shaft 602 and corresponds to the buffer outer circumferential groove 222, the left shaft sleeve 703 and the right shaft sleeve 705 are arranged at the upper end of the bearing gland 701, the top shaft plate 702 is arranged between the left shaft sleeve 703 and the right shaft sleeve 705 through the clasp spring 704, and the cam 603 is arranged in the left shaft sleeve 703 and the right shaft sleeve 705.

[0046] The working principle and beneficial effects of the above technical solution are as follows: the specific structure of the fixing member 7 is provided in the embodiment, the fixing member 7 of the structure comprises a bearing gland 701, a top shaft plate 702, a left shaft sleeve 703, a clamping spring 704, and a right shaft sleeve 705, the bearing gland 701 is sleeved on the vertical stop shaft 602 and corresponds to the buffer outer circumferential groove 222, the left shaft sleeve 703 and the right shaft sleeve 705 are installed at the upper end of the bearing gland 701, the top shaft plate 702 is installed between the left shaft sleeve 703 and the right shaft sleeve 705 through the clamping spring 704, and the cam 603 is installed inside the left shaft sleeve 703 and the right shaft sleeve 705, the vertical stop shaft 602 is installed in the support cylinder 22 through the bearing gland 701, and the top shaft plate 702, the left shaft sleeve 703, the clamping spring 704, and the right shaft sleeve 705 provide an installation space for the cam 603.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Although the embodiments of the present application have been disclosed as above, they are not limited to only the applications listed in the specification and embodiments, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A central control electrically driven caster with a buffer damping function, characterized in that, Include: The central control caster body (100) includes an electric wheel part, a buffer damping part (6), the buffer damping part (6) is arranged at the rear side of the electric wheel part, the electric wheel part includes a drive wheel, a drive control part and a slope identification module (5), the drive wheel includes two wheel bodies (1), a support (2), the rear end of the support (2) is provided with a supporting cylinder (22), the supporting cylinder (22) is provided with a buffer outer circumferential groove (222), the supporting cylinder (22) is further provided with a stepped hole (221), the buffer outer circumferential groove (222) is located at the outer circumference of the stepped hole (221), and the buffer outer circumferential groove (222) is provided with a buffer spring (223), a fixing part (7) is inserted into the buffer outer circumferential groove (222) and abuts against the buffer spring (223), and the fixing part (7) is provided with a screw sleeve (700), and the screw sleeve (700) is screwed with the upper end of the supporting cylinder (22); The buffer damping part (6) is arranged in the supporting cylinder (22), and the buffer damping part (6) includes a directional brake part (601), a vertical stop shaft (602) and a cam (603), the directional brake part (601) is arranged in a directional groove (604) inside the support (2), the vertical stop shaft (602) is provided with a stop shaft spring (605) and is arranged in the supporting cylinder (22) through a fixing part (7), the fixing part (7) is arranged at the upper end of the supporting cylinder (22), the lower end of the vertical stop shaft (602) extends into the directional brake part (601) and is connected with the directional brake part (601), and the cam (603) is arranged in the upper end of the fixing part (7) and is used for driving the vertical stop shaft (602).

2. The electrically driven central control caster with buffer and shock absorption function according to claim 1, characterized in that, The drive control part and the slope identification module (5) are arranged in the drive wheel, and the buffer damping part (6) is arranged at the rear side of the drive wheel.

3. The electrically driven central control caster with buffer and shock absorption function according to claim 2, characterized in that, The support (2) includes a caster support (21), the wheel body (1) is provided with two and is located at both sides of the caster support (21); the drive control part includes a drive part (3) and a control module (4), the drive part (3) includes a motor (31) and two couplings (32), the motor (31) is arranged horizontally in the caster support (21), the motor (31) is connected with the wheel body (1) through the coupling (32), and the slope identification module (5) and the motor (31) are electrically connected with the control module (4) respectively.

4. The electrically driven central control caster with buffer and shock absorption function according to claim 3, characterized in that, The drive part (3) further includes a horizontal bearing (33), the horizontal bearing (33) is arranged in the caster support (21), and the coupling (32) is arranged in the horizontal bearing (33).

5. The electrically driven central control caster with buffer and shock absorption function according to claim 3, characterized in that, The inner side of the wheel body (1) is provided with a connecting shaft (11), the connecting shaft (11) is connected with the output shaft (311) of the motor (31) through the coupling (32), and the outer side of the wheel body (1) is provided with a dust cover (12).

6. The electrically driven central control caster with buffer and shock absorption function according to claim 3, characterized in that, The slope identification module (5) is provided with two, the trolley support (21) is respectively provided with first identification hole (211), second identification hole (212), two the slope identification module (5) is arranged in first identification hole (211), second identification hole (212) respectively, the slope identification module (5) is arranged as one of laser radar, camera.

7. The electrically driven central control caster with buffer and shock absorption function according to claim 3, characterized in that, The buffer damping part (6) further includes a longitudinal connecting shaft (606), a first bearing (607), and a second bearing (608). The longitudinal connecting shaft (606) is arranged in the stepped hole (221). The vertical stop shaft (602) penetrates the longitudinal connecting shaft (606). The longitudinal connecting shaft (606) has a stepped ring (609). The stepped ring (609) is arranged in the stepped hole (221) through the first bearing (607). The second bearing (608) is sleeved on the longitudinal connecting shaft (606) and located below the stepped ring (609).

8. The electrically driven central control caster with buffer and shock absorption function according to claim 1, characterized in that, The fixing part (7) includes a bearing gland (701), a top shaft plate (702), a left shaft sleeve (703), a clamping spring (704), and a right shaft sleeve (705). The bearing gland (701) is sleeved on the vertical stop shaft (602) and corresponds to the buffer outer circumferential groove (222). The left shaft sleeve (703) and the right shaft sleeve (705) are arranged at the upper end of the bearing gland (701). The top shaft plate (702) is arranged between the left shaft sleeve (703) and the right shaft sleeve (705) through the clamping spring (704). The cam (603) is arranged inside the left shaft sleeve (703) and the right shaft sleeve (705).

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