Turnover plate mechanism

Abstract

The utility model discloses a turning plate mechanism which comprises a base, a telescopic assembly, a turning plate and a chain type annular supporting rod, the base is provided with an installation groove, the chain type annular supporting rod is formed by sequentially and movably connecting a plurality of chain link units, and the chain link units are all block-shaped and are sequentially embedded in the installation groove. The adjacent chain link units can vertically and upwards rotate relative to each other, the opposite side walls of the adjacent chain link units can abut against each other through rotation, the telescopic assembly is installed in the installation groove, the telescopic end of the telescopic assembly is movably connected with the tail chain link unit in the multiple chain link units, and the other end of the telescopic assembly is movably connected with the base; the turnover plate is movably connected with the base and movably connected with the head chain link unit in the chain link units, the chain link units rotate upwards section by section from head to tail and abut against the adjacent chain link units to lift the turnover plate through extension of the telescopic assembly, and the turnover plate is simple in overall structure, low in manufacturing cost and high in practicability. And the turning-up can be stopped at any time.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical structures, in particular to a flap mechanism. Background Art

[0002] Flipping a lid is an action that is often used in daily life. Most of them are manual, some are gas springs, or thorn hinges, and there are also electric opening methods, such as the electric trunk lid of a car.

[0003] Gas springs have a simple structure but can't be stopped at will. Spikes can be stopped in several fixed positions, but they still require manual operation. Other electric springs are also complex and expensive.

[0004] Therefore, providing a flap mechanism with a simple structure, low cost, the ability to stop at will and no need for manual operation is an urgent problem to be solved in this field. Utility Model Content

[0005] In view of the above-mentioned technical problems existing in the existing flip-up mechanism, the purpose of the present utility model is to provide a flip-up mechanism with a simple overall structure and low manufacturing cost. As the extension or retraction stroke of the telescopic component stops, the chain ring support rod stops moving, so that the flip-up can be stopped at any time. The telescopic component is used for driving, and there is no need for manual flipping, which solves the problems existing in the existing technology well.

[0006] In order to achieve the above purpose, the flap mechanism provided by the present invention includes a base, a telescopic assembly, a flap, and a chain-type ring support rod. The base is provided with a mounting groove.

[0007] The chain-type ring strut is composed of a plurality of chain link units that are movably connected in sequence. The plurality of chain link units are block-shaped and are sequentially embedded in the mounting grooves. Adjacent chain link units can rotate vertically upward relative to each other, and the opposite side walls of the adjacent chain link units can abut against each other by rotating.

[0008] The telescopic assembly is installed in the installation slot, the telescopic end of the telescopic assembly is movably connected to the tail link unit among the plurality of link units, and the other end is movably connected to the base;

[0009] The flap is movably connected to the base and to the head link unit among the plurality of link units. Through the extension of the telescopic assembly, the plurality of link units rotate upward one by one in sequence from the head to the tail and abut and lift up with the adjacent link units to support the flap and gradually flip it up.

[0010] Furthermore, the groove wall of the installation groove is symmetrically provided with two first connection holes for connecting with the telescopic assembly, and two second connection holes for connecting with the flap.

[0011] Furthermore, the telescopic component is a telescopic motor, and openings are respectively provided at both ends of the telescopic motor. The opening on the telescopic end of the telescopic motor is movably connected to the tail link unit among the several link units, and the opening at the other end is movably connected to the two first connection holes on the mounting slot.

[0012] Furthermore, the flap is a channel steel structure, and its groove wall is symmetrically provided with a first mounting hole and a second mounting hole. The flap is connected to the second connecting hole on the mounting groove through the first mounting hole, and the flap is movably connected to the head link unit among several link units through the second mounting hole.

[0013] Furthermore, the plurality of chain link units include a first rod section, a plurality of single-ear rod sections, a plurality of double-ear rod sections, and a tail rod section.

[0014] The first rod section is movably connected to the second mounting hole on the flap, and the tail rod section is movably connected to the opening on the telescopic end of the telescopic assembly;

[0015] The contact surfaces between the adjacent first section rod parts, single ear rod parts, double ear rod parts, and tail section rod parts are all configured as mutually matching inclined surfaces;

[0016] The multiple single-ear rod portions and the multiple double-ear rod portions are alternately arranged between the first rod portion and the tail rod portion and are movably connected to each other. The horizontal height of the movable connection point between the first rod portion and the flap is higher than the horizontal height of the movable connection point between the first rod portion and the single-ear rod portion. The horizontal height of the movable connection point between the first rod portion and the single-ear rod portion is on the same horizontal plane as the movable connection points between the multiple single-ear rod portions and the multiple double-ear rod portions and the movable connection point between the tail rod portion and the telescopic assembly.

[0017] Furthermore, a first through hole is provided at the top of one end of the first section of the rod, and the first through hole is cooperated and connected with the second mounting hole on the flap, and a first groove is provided at the bottom of the other end, and two first connecting parts are arranged opposite to each other in the first groove, and the two first connecting parts are both provided with a second through hole, and the two second through holes are located on the same axis for cooperating and movably connecting with the single-ear rod.

[0018] Furthermore, the single-ear rod portion is in an isosceles trapezoidal shape as a whole, and two bottom corners of the single-ear rod portion are symmetrically provided with second grooves, and the two second grooves are each provided with a second connecting portion, and the second connecting portion is provided with a third through hole;

[0019] The second connecting portion at one end of the first single-ear rod section of the plurality of single-ear rod sections is disposed between the two first connecting portions of the first rod section, and the third through hole is coaxial with the second through holes on the two first connecting portions and is movably connected thereto; the second connecting portion at the other end of the first single-ear rod section of the plurality of single-ear rod sections is movably connected thereto in cooperation with the double-ear rod section;

[0020] The remaining single-ear rod parts are movably connected to the adjacent double-ear rod parts through the second connecting parts at both ends.

[0021] Furthermore, the double-ear rod portion is an isosceles trapezoid as a whole, and two bottom corners of the double-ear rod portion are symmetrically provided with third grooves, and two third connecting portions are respectively provided in the two third grooves, and two third connecting portions are respectively provided with fourth through holes, and the two fourth through holes are located on the same axis;

[0022] The two third connecting parts at one end of the double-ear rod part of the tail section of the plurality of double-ear rod parts are located on both sides of the second connecting part at one end of the single-ear rod part, and the fourth through hole and the second through hole on the second connecting part are located on the same axis and are movably connected;

[0023] The two third connecting parts at the other end of the double ear rod part of the tail section of the plurality of double ear rod parts are used to cooperate with and movably connect with the tail section rod part;

[0024] The remaining double-ear rod parts are movably connected to the second connecting parts at one end of the two adjacent single-ear rod parts through the third connecting parts at both ends;

[0025] Furthermore, a fourth groove is provided at the bottom of the tail section rod portion adjacent to the double ear rod portion, a fourth connecting portion is provided in the fourth groove, and a fifth through-hole is provided in the fourth connecting portion. The fourth connecting portion of the tail section rod portion is located between the two third connecting portions at one end of the double ear rod portion, and the fifth through-hole and the fourth through-hole on the third connecting portion are located on the same axis and are movably connected.

[0026] A motor placement groove is provided on the other side of the tail section rod, and the telescopic end of the telescopic motor can be placed in the motor placement groove. The opposite groove walls of the placement groove are symmetrically provided with two sixth through holes corresponding to the openings on the telescopic end of the telescopic motor, and the two sixth through holes are movably connected to the openings on the telescopic end of the telescopic motor.

[0027] The flip mechanism provided by the utility model has a simple overall structure and low manufacturing cost. As the extension or retraction stroke of the telescopic component stops, the chain ring support rod stops moving, so that the flip plate can be stopped at any time when it is flipped up. The telescopic component is used for driving, and there is no need for manual flipping, which effectively solves the problems existing in the prior art.

[0028] The flap mechanism provided by the utility model also has the following beneficial effects:

[0029] (1) The modular chain-type ring struts are easy to produce in large quantities and reduce production costs;

[0030] (2) The chain-type ring struts can be made of environmentally friendly engineering plastics and can be recycled;

[0031] (3) The entire mechanism is light and simple in structure and can be embedded for installation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 This is a schematic diagram of the explosion structure of the flap mechanism provided by the utility model;

[0034] Figure 2 This is a side cross-sectional schematic diagram of the initial state of the flap mechanism provided by the utility model;

[0035] Figure 3 This is a side cross-sectional schematic diagram of the first section of the flip mechanism provided by the utility model in a raised state;

[0036] Figure 4 This is a side cross-sectional diagram of the first section of the single-ear rod in the flap mechanism provided by the utility model in a raised state;

[0037] Figure 5 This is a side cross-sectional schematic diagram of a plurality of single-ear rod portions and a plurality of double-ear rod portions in a flap mechanism provided by the present invention in a raised state;

[0038] Figure 6 This is a structural diagram of the first section of the rod in the flap mechanism provided by the utility model;

[0039] Figure 7 This is a structural diagram of a single-ear rod portion in the flap mechanism provided by the utility model;

[0040] Figure 8 This is a structural diagram of the double-ear rod portion of the flap mechanism provided by the utility model;

[0041] Figure 9 This is a structural schematic diagram of the tail section rod portion of the flip mechanism provided by the utility model.

[0042] Illustration:

[0043] Front axle pin 1, rear axle pin 2, first rotating shaft 3, second rotating shaft 4, axle pin 5;

[0044] Base 100, telescopic assembly 200, flap 300, chain-type ring support rod 400;

[0045] Mounting slot 110, first connecting hole 111, second connecting hole 112, first section rod 410, first through hole 411, first groove 412, first connecting part 413, second through hole 413a, single ear rod 420, second groove 421, second connecting part 422, third through hole 422a, double ear rod 430, third groove 431, third connecting part 432, fourth through hole 432a, tail section rod 440, fourth groove 441, fourth connecting part 442, fifth through hole 442a, motor placement slot 443, sixth through hole 443a. DETAILED DESCRIPTION

[0046] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0047] See also Figure 1 , which is a structural schematic diagram of the flip mechanism provided by the utility model.

[0048] As can be seen from the drawings, the flap mechanism provided by the present invention includes four components: a base 100 , a telescopic assembly 200 , a flap 300 , and a chain-type ring-shaped support rod 400 .

[0049] The base 100 is a structural main body, and is provided with a mounting groove 110 for supporting other components.

[0050] The chain-type ring strut 400 is composed of a plurality of chain link units that are movably connected in sequence. The plurality of chain link units are block-shaped and are sequentially embedded in the mounting grooves 110. Adjacent chain link units can rotate vertically upward relative to each other, and the opposite side walls of the adjacent chain link units can abut against each other by rotating.

[0051] The telescopic assembly 200 is installed in the installation groove 110. The telescopic end of the telescopic assembly 200 is movably connected to the tail link unit among the plurality of link units, and the other end is movably connected to the base 100.

[0052] The flap 300 is movably connected to the base 100 and is movably connected to the first link unit among the plurality of link units;

[0053] In actual application, through the extension of the telescopic assembly 200, several link units rotate upward one by one in sequence from the beginning to the end and abut against and lift up adjacent link units in turn to support the flap 300 and gradually flip up the flap 300.

[0054] When the telescopic assembly 200 is retracted, the chain link units rotate downward one by one in sequence from the rear to the front and contact the base 100 to rotate the flap 300 in the opposite direction and lower it.

[0055] The flip mechanism provided by the present invention has a simple overall structure and low manufacturing cost. As the extension or retraction stroke of the telescopic component 200 stops, the chain ring support rod 400 stops moving, so that the flip plate 300 can be stopped at any time when flipping up. The telescopic component 200 is used for driving, and there is no need for manual flipping, which effectively solves the problems existing in the prior art.

[0056] Specifically, such as Figure 1 The base 100 is provided with a mounting groove 110 so that the base 100 as a whole is a channel steel structure. The mounting groove 110 is used to guide and limit the chain ring support rod 400, and can limit the horizontal position of the chain ring support rod 400 to avoid shaking when several chain link units are lifted.

[0057] The groove wall of the installation groove 110 is symmetrically provided with two first connection holes 111 for connecting with the telescopic assembly 200 and two second connection holes 112 for connecting with the flap 300 .

[0058] Furthermore, the telescopic assembly 200 is mounted in the mounting groove 110 on the base 100, as shown in FIG. Figure 1 , the telescopic assembly 200 is preferably located at one end of the mounting slot 110;

[0059] The telescopic component 200 in this embodiment adopts a telescopic motor, and openings are provided at both ends of the telescopic motor. The opening on the telescopic end of the telescopic motor and the tail link unit among the several link units are preferably connected by a front axle pin 1 for movability, and the opening at the other end and the two first connecting holes 111 on the installation slot 110 are preferably connected by a rear axle pin 2 for movability.

[0060] In this example, the flap 300 is a channel steel structure, and its groove wall is symmetrically provided with a first mounting hole and a second mounting hole. The flap 300 is connected to the second connecting hole 112 on the mounting groove 110 through the first mounting hole and preferably uses the first rotating shaft 3. The flap 300 is movably connected to the head link unit among several link units through the second mounting hole and preferably uses the second rotating shaft 4.

[0061] Furthermore, the plurality of link units include a first rod section 410, a plurality of single-ear rod sections 420, a plurality of double-ear rod sections 430, and a tail rod section 440.

[0062] The first rod section 410 is movably connected to the second mounting hole on the flap 300, and the tail rod section 440 is movably connected to the opening on the telescopic end of the telescopic assembly 200;

[0063] A plurality of single-ear rod portions 420 and a plurality of double-ear rod portions 430 are alternately arranged between the first rod portion 410 and the tail rod portion 440 and are movably connected to each other;

[0064] The contact surfaces between the adjacent first section rod portion 410, the single ear rod portion 420, the double ear rod portion 430, and the tail section rod portion 440 are all configured as mutually matching inclined surfaces;

[0065] like Figure 2 The horizontal height of the movable connection point between the first rod section 410 and the flap 300 is higher than the horizontal height of the movable connection point between the first rod section 410 and the single-ear rod section 420. The horizontal height of the movable connection point between the first rod section 410 and the single-ear rod section 420 is also on the same level as the movable connection points between the multiple single-ear rod sections 420 and the multiple double-ear rod sections 430, as well as the movable connection point between the tail rod section 440 and the telescopic assembly 200. Since the force points of the first rod section 410 at the front end are one above and one below, the force angle formed is the largest and the torque is the largest. Therefore, due to the extension of the telescopic assembly 200, the first rod section 410 is the first to begin to tilt and rotate. Since the force points of the multiple single-ear rod sections 420, the multiple double-ear rod sections 430, and the tail rod section 440 behind it are at the same level, the force points of these rods are balanced and thus do not tilt and rotate randomly. Until the side wall of the first rod section 410 collides with the side wall of the next single-ear rod section 420;

[0066] like Figure 3 At this time, the first rod section 410 and the subsequent single-ear rod section 420 form a relatively immovable integral part, which will drive the first single-ear rod section 420 to rotate and fold up;

[0067] like Figure 4 , Figure 5 According to this principle, as more rods are rotated and folded, the support point of the flap 300 begins to become higher, and the flap 300 begins to rotate and flip up.

[0068] When the telescopic assembly 200 is retracted, the movement sequence of the plurality of rods is exactly opposite to that when the telescopic assembly is extended.

[0069] Furthermore, the structures of the first rod section 410 , the single-ear rod section 420 , the double-ear rod section 430 , and the tail rod section 440 are described in detail below with reference to the accompanying drawings.

[0070] like Figure 6 A first through hole 411 is provided at the top of one end of the first section of the rod 410, and the first through hole 411 is cooperated with the second mounting hole on the flap 300. A first groove 412 is provided at the bottom of the other end, and two first connecting parts 413 are arranged opposite to each other in the first groove 412. The two first connecting parts 413 are both provided with a second through hole 413a. The two second through holes 413a are located on the same axis and are used to cooperate with the single-ear rod 420 for active connection.

[0071] like Figure 7The single-ear rod portion 420 is an isosceles trapezoid as a whole, and the two bottom corners of the single-ear rod portion 420 are symmetrically provided with second grooves 421, and the two second grooves 421 are each provided with a second connecting portion 422, and the second connecting portion 422 is provided with a third through hole 422a;

[0072] The second connecting portion 422 at one end of the first single-ear rod portion 420 among the plurality of single-ear rod portions 420 is disposed between the two first connecting portions 413 of the first rod portion 410, and the third through-hole 422a is coaxial with the second through-holes 413a on the two first connecting portions 413. An axle pin 5 is preferably used to connect the two first connecting portions 413 and the second connecting portion 422. The second connecting portion 422 at the other end of the first single-ear rod portion 420 among the plurality of single-ear rod portions 420 is movably connected to the double-ear rod portion 430.

[0073] The remaining single-ear rod portions 420 are movably connected to the adjacent double-ear rod portions 430 through the second connecting portions 422 at both ends.

[0074] like Figure 8 The double-ear rod portion 430 is an isosceles trapezoid as a whole. The two bottom corners of the double-ear rod portion 430 are symmetrically provided with third grooves 431, and two third connecting portions 432 are respectively provided in the two third grooves 431. The two third connecting portions 432 are each provided with a fourth through-hole 432a, and the two fourth through-holes 432a are located on the same axis.

[0075] The two third connecting portions 432 at one end of the double-ear rod portion 430 of the tail section of the multiple double-ear rod portions 430 are located on both sides of the second connecting portion 422 at one end of the single-ear rod portion 420, and the fourth through hole 432a and the second through hole 413a on the second connecting portion 422 are located on the same axis, and are preferably connected by an axle pin 5;

[0076] The two third connecting parts 432 at the other end of the tail section of the double ear rod part 430 of the plurality of double ear rod parts 430 are used to cooperate with the tail section rod part 440 for movably connecting;

[0077] The remaining two-ear rod portions 430 are movably connected to the second connection portions 422 at one end of two adjacent single-ear rod portions 420 through the third connection portions 432 at both ends.

[0078] like Figure 9 A fourth groove 441 is provided at the bottom of the tail section rod portion 440 adjacent to the double ear rod portion 430. A fourth connecting portion 442 is provided in the fourth groove 441. The fourth connecting portion 442 is provided with a fifth through-hole 442a. The fourth connecting portion 442 of the tail section rod portion 440 is located between the two third connecting portions 432 at one end of the double ear rod portion 430. The fifth through-hole 442a and the fourth through-hole 432a on the third connecting portion 432 are located on the same axis, and are preferably connected using an axle pin 5.

[0079] A motor placement groove 443 is provided on the other side of the tail section rod 440, and the motor placement groove 443 can be used for the telescopic end of the telescopic motor 200 to be placed therein. The opposite groove walls of the placement groove 443 are symmetrically provided with two sixth through holes 443a corresponding to the openings on the telescopic end of the telescopic motor 200. The two sixth through holes 443a are preferably connected to the openings on the telescopic end of the telescopic motor 200 through the rear axle pin 2.

[0080] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A flap mechanism, characterized in that: It includes a base, a telescopic component, a flap, and a chain-type ring support rod. The base is provided with a mounting groove. The chain-type ring strut is composed of a plurality of chain link units that are movably connected in sequence. The plurality of chain link units are block-shaped and are sequentially embedded in the mounting grooves. Adjacent chain link units can rotate vertically upward relative to each other, and the opposite side walls of the adjacent chain link units can abut against each other by rotating. The telescopic assembly is installed in the installation slot, the telescopic end of the telescopic assembly is movably connected to the tail link unit among the plurality of link units, and the other end is movably connected to the base; The flap is movably connected to the base and to the head link unit among the plurality of link units. Through the extension of the telescopic assembly, the plurality of link units rotate upward one by one in sequence from the head to the tail and abut and lift up with the adjacent link units to support the flap and gradually flip it up.

2. The flap mechanism according to claim 1, characterized in that: The groove wall of the installation groove is symmetrically provided with two first connection holes for connecting with the telescopic assembly, and two second connection holes for connecting with the flap.

3. The flap mechanism according to claim 2, characterized in that: The telescopic component is a telescopic motor, and openings are respectively provided at both ends of the telescopic motor. The opening on the telescopic end of the telescopic motor is movably connected to the tail link unit among the plurality of chain link units, and the opening at the other end is movably connected to the two first connection holes on the mounting slot.

4. The flap mechanism according to claim 2, characterized in that: The flap is a channel steel structure, and its groove wall is symmetrically provided with a first mounting hole and a second mounting hole. The flap is connected to the second connecting hole on the mounting groove through the first mounting hole, and the flap is movably connected to the head link unit among several link units through the second mounting hole.

5. The flap mechanism according to claim 1, characterized in that: The chain link units include a first rod section, a plurality of single-ear rod sections, a plurality of double-ear rod sections, and a tail rod section. The first rod section is movably connected to the second mounting hole on the flap, and the tail rod section is movably connected to the opening on the telescopic end of the telescopic assembly; The contact surfaces between the adjacent first section rod parts, single ear rod parts, double ear rod parts, and tail section rod parts are all configured as mutually matching inclined surfaces; The multiple single-ear rod portions and the multiple double-ear rod portions are alternately arranged between the first rod portion and the tail rod portion and are movably connected to each other. The horizontal height of the movable connection point between the first rod portion and the flap is higher than the horizontal height of the movable connection point between the first rod portion and the single-ear rod portion. The horizontal height of the movable connection point between the first rod portion and the single-ear rod portion is on the same horizontal plane as the movable connection points between the multiple single-ear rod portions and the multiple double-ear rod portions and the movable connection point between the tail rod portion and the telescopic assembly.

6. The flap mechanism according to claim 5, characterized in that: A first through hole is provided at the top of one end of the first section of the rod, and the first through hole is cooperated and connected with the second mounting hole on the flap. A first groove is provided at the bottom of the other end, and two first connecting parts are arranged opposite to each other in the first groove. Both first connecting parts are provided with a second through hole, and the two second through holes are located on the same axis for cooperating and movably connecting with the single-ear rod.

7. The flap mechanism according to claim 6, characterized in that: The single-ear rod portion is in an isosceles trapezoidal shape as a whole, and two bottom corners of the single-ear rod portion are symmetrically provided with second grooves, and the two second grooves are each provided with a second connecting portion, and the second connecting portion is provided with a third through hole; The second connecting portion at one end of the first single-ear rod section of the plurality of single-ear rod sections is disposed between the two first connecting portions of the first rod section, and the third through hole is coaxial with the second through holes on the two first connecting portions and is movably connected thereto; the second connecting portion at the other end of the first single-ear rod section of the plurality of single-ear rod sections is movably connected thereto in cooperation with the double-ear rod section; The remaining single-ear rod parts are movably connected to the adjacent double-ear rod parts through the second connecting parts at both ends.

8. The flap mechanism according to claim 7, characterized in that: The double-ear rod portion is an isosceles trapezoid as a whole, and the two bottom corners of the double-ear rod portion are symmetrically provided with third grooves, and two third connecting parts are respectively provided in the two third grooves, and the two third connecting parts are each provided with a fourth through hole, and the two fourth through holes are located on the same axis; The two third connecting parts at one end of the double-ear rod part of the tail section of the plurality of double-ear rod parts are located on both sides of the second connecting part at one end of the single-ear rod part, and the fourth through hole and the second through hole on the second connecting part are located on the same axis and are movably connected; The two third connecting parts at the other end of the double ear rod part of the tail section of the plurality of double ear rod parts are used to cooperate with and movably connect with the tail section rod part; The remaining double-ear rod parts are movably connected to the second connecting parts at one end of two adjacent single-ear rod parts through the third connecting parts at both ends.

9. The flap mechanism according to claim 8, characterized in that: A fourth groove is provided at the bottom of the tail section rod portion adjacent to the double ear rod portion, a fourth connecting portion is provided in the fourth groove, and a fifth through-hole is provided in the fourth connecting portion. The fourth connecting portion of the tail section rod portion is located between the two third connecting portions at one end of the double ear rod portion, and the fifth through-hole and the fourth through-hole on the third connecting portion are located on the same axis and are movably connected. A motor placement groove is provided on the other side of the tail section rod, and the telescopic end of the telescopic motor can be placed in the motor placement groove. The opposite groove walls of the placement groove are symmetrically provided with two sixth through holes corresponding to the openings on the telescopic end of the telescopic motor, and the two sixth through holes are movably connected to the openings on the telescopic end of the telescopic motor.

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