Pressure testing device

Abstract

The utility model belongs to the technical field of pressure testing, and discloses a pressure testing device, which comprises a support, a carrier, a pressurizing assembly and a push-pull assembly, and is characterized in that the support is provided with the carrier, and the carrier is provided with a positioning groove for placing a piece to be tested; the pressurizing assembly comprises a tool rest slidably arranged on the support in the vertical direction and a tool arranged on the tool rest, and the tool is located above the positioning groove; the push-pull assembly is slidably arranged on the support in the first horizontal direction, the push-pull assembly comprises an inclined column, the inclined column and the vertical direction form an included angle, and the push-pull assembly slides and has a first position and a second position; at the first position, the periphery of the inclined column abuts against the tool rest, and a first receding gap is formed between the tool and the top of the carrier in the vertical direction; at the second position, a second receding gap is formed between the periphery of the inclined column and the tool rest in the vertical direction, and the tool abuts against the to-be-tested piece under the gravity effect of the pressurizing assembly. The pressure testing device provided by the utility model is convenient to control the falling speed of the cutter.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure test technical field especially relates to a pressure testing device. BACKGROUND

[0002] Cable sheath high temperature pressure test is a kind of test method for evaluating the performance of cable sheath material under the joint action of high temperature and pressure, this test is usually used to verify whether cable sheath material can withstand specific working environment to prevent damage under extreme conditions, cable sheath high temperature pressure test is crucial to ensure the safety and reliability of cable product, through this test, it can be ensured that the product produced can normally operate in the expected working environment, and will not be damaged due to excessive temperature or pressure, so as to ensure the stable operation of power system and the safety of user.

[0003] In the related art, before testing the cable sheath, the cutter needs to be lifted away from the carrier, and the cable sheath is placed on the carrier, and then the cutter is pressed on the cable sheath, and the direct lifting or lowering of the cutter may cause operation errors, such as rapid downward movement of the cutter, sudden release of the cutter by the tester, resulting in accelerated falling of the cutter, which impacts the cable sheath or the carrier, affecting the test result. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of pressure testing device, it is convenient to control the falling speed of cutter.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Provide a kind of pressure testing device, comprising:

[0007] Support, the support is equipped with carrier, the top of the carrier is equipped with the positioning slot for placing the measured piece;

[0008] Pressurizing component, including the cutter rest being slid along vertical direction and being arranged on the support, and the cutter being arranged on the cutter rest, the cutter is located above the positioning slot;

[0009] Push-pull component, it is slid along first horizontal direction and is arranged on the support, the push-pull component includes inclined column, the inclined column is arranged at the angle with vertical direction, the push-pull component has first position and second position along first horizontal direction sliding;

[0010] In the first position, the periphery of the inclined column is in abutment with the cutter rest, and the first gap is formed between the cutter and the top of the carrier along the vertical direction;

[0011] At the second position, a second clearance gap is formed between the periphery of the inclined column and the tool holder in the vertical direction, and the tool is in contact with the test piece under the gravity of the pressing assembly.

[0012] Optionally, the tool holder comprises a top beam and guide bars arranged at both ends of the top beam, the top beam is arranged to extend in a second horizontal direction, the tool is arranged on the top beam, and the guide bars are arranged to extend in a vertical direction.

[0013] The support is provided with a guide channel corresponding to the guide bar, and the guide bar is slidably arranged in the guide channel.

[0014] Optionally, the support comprises a support member, the support member is provided with an open slot on both sides in the second horizontal direction, a first roller is arranged between two opposite side walls of the open slot, a guide channel is formed between the first roller and the open slot, and the guide bar is in contact with the periphery of the corresponding first roller.

[0015] Optionally, the support member is provided with a guide block on both sides in the second horizontal direction, and the open slot is arranged on the guide block.

[0016] Optionally, the tool holder further comprises a bottom beam, the bottom beam and the top beam are spaced apart in the vertical direction, and a clearance channel is formed between the bottom beam, the top beam and the guide bar, and the tool is arranged in the clearance channel.

[0017] At the first position, the bottom beam is in contact with the periphery of the inclined column.

[0018] At the second position, the second clearance gap is formed between the bottom beam and the periphery of the inclined column.

[0019] Optionally, the tool holder further comprises a bottom beam, the bottom beam and the top beam are spaced apart in the vertical direction, and a clearance channel is formed between the bottom beam, the top beam and the guide bar, and the tool is arranged in the clearance channel, and a second roller is rotatably connected to the bottom beam.

[0020] At the first position, the second roller is in contact with the periphery of the inclined column.

[0021] At the second position, the second clearance gap is formed between the second roller and the periphery of the inclined column.

[0022] Optionally, the support comprises a guide sleeve, and the push-pull assembly further comprises a guide rod, a first end of the guide rod being provided with a stop block, and a second end of the guide rod being slidably arranged in the guide sleeve along the first horizontal direction and connected with the inclined column.

[0023] Optionally, the pressing assembly further comprises a counterweight, and the counterweight is detachably connected with the tool holder.

[0024] Optionally, the push-pull assembly is connected with a driving member, and the driving member is used for driving the push-pull assembly to move between the first position and the second position.

[0025] Optionally, a plurality of the carriers are arranged on the support along the second horizontal direction, the pressing assembly comprises a plurality of pressing assemblies and is arranged in one-to-one correspondence with the carriers, the push-pull assembly comprises a plurality of inclined columns corresponding to the carriers in one-to-one correspondence, and the push-pull assembly further comprises a push-pull handle connected with all the inclined columns.

[0026] Beneficial effects: When the pressure testing device provided by the utility model is used to load a to-be-tested piece, first, the push-pull assembly is moved from the second position to the first position along the first horizontal direction, the tool holder is pressed by the peripheral part of the inclined column to lift the tool, the tool and the carrier form a first gap suitable for placing the to-be-tested piece, and the to-be-tested piece is placed in the positioning groove of the carrier. Compared with lifting the tool by applying a force in the vertical direction, the tool is lifted by applying a force in the horizontal direction to the push-pull assembly, which is more suitable for operation of an operator. Then, the push-pull assembly is moved from the first position to the second position along the first horizontal direction, under the action of gravity, the support abuts against the peripheral part of the inclined column and gradually moves downward until the tool abuts against the to-be-tested piece, the falling speed of the tool is conveniently controlled, and the testing accuracy is effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a first perspective structural schematic view of the pressure testing device provided by the utility model;

[0028] Figure 2 is a second perspective structural schematic view of the pressure testing device provided by the utility model;

[0029] Figure 3 is a third perspective structural schematic view of the pressure testing device provided by the utility model;

[0030] Figure 4 is a fourth perspective structural schematic view of the pressure testing device provided by the utility model; Figure 3 is an enlarged schematic view of the structure at A in the fourth perspective structural schematic view of the pressure testing device provided by the utility model;

[0031] Figure 5 is a fourth perspective structural schematic view of the pressure testing device provided by the utility model;

[0032] Figure 6 is a structural schematic view of the test box provided by the utility model.

[0033] In the figure:

[0034] 100, support; 101, guide channel; 110, support piece; 111, guide block; 112, vertical support part; 113, horizontal support part; 120, first roller; 130, support table; 140, support leg; 150, guide sleeve; 160, support rod;

[0035] 200, pressurizing assembly; 210, tool holder; 211, top crossbeam; 212, guide strip; 213, bottom crossbeam; 220, cutter; 230, second roller; 240, counterweight; 250, weight; 260, hanging rod;

[0036] 300, push-pull assembly; 310, inclined column; 320, guide rod; 330, stop block; 340, push-pull handle;

[0037] 400, carrier; 410, positioning groove;

[0038] 500, test box. DETAILED DESCRIPTION

[0039] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used for explaining the utility model and are not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all the structures.

[0040] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] Reference Figures 1 to 5 As shown, this embodiment provides a pressure testing device, which includes a support 100, a carrier 400, a pressurizing component 200, and a push-pull component 300.

[0044] Specifically, the support 100 is provided with a carrier 400, and the top of the carrier 400 is provided with a positioning groove 410 for placing a test piece (not shown); the pressure assembly 200 includes a tool holder 210 slidably disposed on the support 100 in the vertical direction and a tool 220 disposed on the tool holder 210, the tool 220 being located above the positioning groove 410; the push-pull assembly 300 is slidably disposed on the support 100 in the first horizontal direction, the push-pull assembly 300 includes an inclined column 310, the inclined column 310 being disposed at an angle to the vertical direction, and the push-pull assembly 300 having a first position and a second position by sliding in the first horizontal direction.

[0045] Specifically, in the first position, the periphery of the inclined column 310 abuts against the tool holder 210, and a first clearance gap is formed between the tool 220 and the top of the carrier 400 in the vertical direction.

[0046] Specifically, in the second position, a second clearance gap is formed between the periphery of the inclined column 310 and the tool holder 210 in the vertical direction, and the tool 220 abuts against the workpiece under the gravity of the pressure assembly 200.

[0047] For example, the test piece (UTP) includes, but is not limited to, cable sheaths. The pressure testing apparatus can be adapted to pressure testing of different sizes and models of UTPs by changing the carrier 400.

[0048] In the embodiment, the first horizontal direction and the second horizontal direction can be perpendicular, the first horizontal direction can be the front-rear direction of the pressure testing device, and the second horizontal direction can be the left-right direction of the pressure testing device.

[0049] When loading the to-be-tested member, first, the push-pull assembly 300 is moved from the second position to the first position along the first horizontal direction, the knife holder 210 is pressed by the peripheral part of the inclined column 310 to lift the cutter 220, the cutter 220 and the carrier 400 form a first gap suitable for placing the to-be-tested member, and the to-be-tested member is placed in the positioning groove 410 of the carrier 400. Compared with lifting the cutter 220 by applying a force in the vertical direction, applying a force in the horizontal direction to the push-pull assembly 300 to lift the cutter 220 is more suitable for the operator to operate. Then, the push-pull assembly 300 is moved from the first position to the second position along the first horizontal direction, the bracket 100 abuts against the peripheral part of the inclined column 310 and gradually moves downward under the action of gravity until the cutter 220 abuts against the to-be-tested member, which facilitates controlling the falling speed of the cutter 220 and effectively ensures the testing accuracy.

[0050] When unloading the to-be-tested member, first, the push-pull assembly 300 is moved from the second position to the first position along the first horizontal direction, the cutter 220 and the carrier 400 form a first gap, and the to-be-tested member is taken away from the positioning groove 410 of the carrier 400; then, the push-pull assembly 300 is moved from the first position to the second position along the first horizontal direction, which facilitates operation and effectively prevents the cutter 220 from being damaged by the carrier 400.

[0051] In the embodiment, continuing to refer to Figures 1 to 5 As shown in the figure, the knife holder 210 includes a top beam 211 and guide strips 212 arranged at both ends of the top beam 211, the top beam 211 is arranged to extend along the second horizontal direction, the cutter 220 is arranged on the top beam 211, and the guide strips 212 are arranged to extend along the vertical direction.

[0052] Specifically, the bracket 100 is provided with guide channels 101 corresponding to the guide strips 212 one by one, and the guide strips 212 slide through the guide channels 101.

[0053] It can be understood that the cutter 220 is located between the two guide strips 212, and through the sliding guidance of the two guide strips 212, the knife holder 210 can be stably moved along the vertical direction, and under the action of gravity, the force value applied to the to-be-tested member by the knife holder 210 through the cutter 220 is stable, which effectively ensures the accuracy of the test results.

[0054] Exemplarily, the cutter 220 can be located in the middle region of the top beam 211 to ensure that the force value applied to the to-be-tested member by the knife holder 210 through the cutter 220 is stable.

[0055] In an embodiment, the support 110 is provided with an open groove on each side along the second horizontal direction, and a first roller 120 is arranged between two opposite side walls of the open groove, and a guide channel 101 is formed between the first roller 120 and the open groove, and the guide strip 212 abuts against the peripheral portion of the corresponding first roller 120, effectively preventing movement from being stuck, and the force value applied by the tool holder 210 to the workpiece through the tool 220 is more stable.

[0056] In an embodiment, the two opposite side walls of the open groove are also provided with the first roller 120, so that the force value applied by the tool holder 210 to the workpiece through the tool 220 is more stable.

[0057] In an embodiment, the support 110 is provided with a guide block 111 on each side along the second horizontal direction, and the guide block 111 is provided with an open groove, facilitating installation of the first roller 120, and reducing the material for manufacturing the support 110. It can be understood that the guide block 111 has a U-shaped structure.

[0058] In an embodiment, the guide block 111 can be connected to the support 110 by welding or threaded connection.

[0059] In some embodiments, the tool holder 210 further comprises a bottom crossbeam 213, and the bottom crossbeam 213 and the top crossbeam 211 are spaced apart along the vertical direction, and a clearance is formed between the bottom crossbeam 213, the top crossbeam 211 and the guide strip 212, and the carrier 400 is arranged in the clearance; wherein, at the first position, the bottom crossbeam 213 abuts against the peripheral portion of the inclined column 310; at the second position, a second clearance is formed between the bottom crossbeam 213 and the peripheral portion of the inclined column 310. It can be understood that the tool holder 210 can have a U-shaped structure. In this embodiment, the bottom crossbeam 213 abuts against the peripheral portion of the inclined column 310, which can stably drive the pressing assembly 200 to slide along the vertical direction by the push-pull assembly 300, and the structure of the pressure testing device is compact.

[0060] In an embodiment, the peripheral portion of the inclined column 310 can abut against the middle region of the bottom crossbeam 213.

[0061] In other embodiments, a second roller 230 is rotatably connected to the bottom crossbeam 213; wherein, at the first position, the second roller 230 abuts against the peripheral portion of the inclined column 310; at the second position, a second clearance is formed between the second roller 230 and the peripheral portion of the inclined column 310. In this embodiment, the second roller 230 abuts against the peripheral portion of the inclined column 310, which can more stably drive the pressing assembly 200 to slide along the vertical direction by the push-pull assembly 300, effectively preventing movement from being stuck.

[0062] Exemplarily, the circumferential part of the inclined column 310 abutting against the tool rest 210 can be in a planar shape or an arc shape, and is in surface contact with the tool rest 210, effectively reducing the wear.

[0063] In the embodiment, continuing to refer to Figures 1 to 5 As shown in the figure, the support 100 further comprises a support table 130, and the support 110 is arranged on the top of the support table 130.

[0064] Exemplarily, the bottom of the support table 130 can be provided with support feet 140, and the pressure testing device is placed in a desired position by the support feet 140.

[0065] Exemplarily, the support table 130 can be in a cuboid shape, and the support feet 140 are arranged at the four corners of the support table 130, so as to ensure that the support table 130 is stably and reliably supported.

[0066] In a feasible implementation, the support 110 can comprise a vertical support part 112 and a horizontal support part 113, the bottom of the vertical support part 112 is connected with the support table 130, the top of the vertical support part 112 is connected with the horizontal support part 113, and the carrier 400 is arranged on the horizontal support part 113. By arranging the vertical support part 112 and the horizontal support part 113, the sliding of the support table 130 along the vertical direction is allowed, and the motion interference is avoided.

[0067] Specifically, the horizontal support part 113 is provided with a guide block 111 on both sides along the second horizontal direction.

[0068] Exemplarily, the shape of the support 110 can be L-shaped.

[0069] In the embodiment, referring to Figure 1 , Figure 3 and Figure 4 As shown in the figure, the support 100 further comprises a guide sleeve 150, and the push-pull assembly 300 further comprises a guide rod 320, the first end of the guide rod 320 is provided with a stop block 330, and the second end of the guide rod 320 is slidably arranged in the guide sleeve 150 along the first horizontal direction and is connected with the inclined column 310. In the embodiment, the guide sleeve 150 and the guide rod 320 are slidably matched, so that the push-pull assembly 300 can stably move along the first horizontal direction, and the stop block 330 can prevent the guide rod 320 from being separated from the guide sleeve 150.

[0070] Specifically, the support 100 further comprises a support rod 160, the support rod 160 and the horizontal support part 113 are located on the same side of the vertical support part 112 along the first horizontal direction, the support rod 160 is arranged in extension along the first horizontal direction, and a first end of the support rod 160 is connected with the vertical support part 112, and a second end of the support rod 160 is connected with the guide sleeve 150, so that the length of the guide rod 320 can be effectively reduced, and the position interference between the guide rod 320 and the vertical support part can be prevented.

[0071] Exemplarily, the support rod 160 is provided with at least one, for example, two support rods 160 are arranged at intervals around the guide sleeve 150.

[0072] In the embodiment, referring to Figure 1 The pressing assembly 200 can further comprise a counterweight 240, the counterweight 240 is detachably connected with the tool holder 210, and the force applied by the pressing assembly 200 to the measured object through the tool 220 can be increased by the counterweight 240, so that the applicability of the pressure testing device is improved.

[0073] Exemplarily, the counterweight 240 can be provided as a tray, and the weights 250 can be placed on the tray to adjust the force applied by the pressing assembly 200 to the measured object through the tool 220, so that the applicability of the pressure testing device is further improved.

[0074] Specifically, the tray is connected with two hanging rods 260, and the hanging rods 260 are correspondingly hung on the two sides of the tool holder 210 along the second horizontal direction.

[0075] In the embodiment, referring to Figures 3 to 5 The support 100 is provided with a plurality of carriers 400 arranged at intervals along the second horizontal direction, the pressing assembly 200 is provided with a plurality of and is correspondingly arranged with the carriers 400, the push-pull assembly 300 comprises a plurality of inclined columns 310 corresponding to the carriers 400, and the push-pull assembly 300 further comprises a push-pull handle 340 connected with all the inclined columns 310. In the embodiment, the push-pull assembly 300 can drive all the pressing assemblies 200 to move along the vertical direction at the same time through the push-pull handle 340, so that the feeding and discharging of a plurality of measured objects can be completed at one time, and the operation is facilitated.

[0076] Exemplarily, the guide sleeve 150, the guide rod 320 and the stop block 330 are correspondingly arranged with the inclined columns 310.

[0077] In the embodiment, the pressure testing device can further comprise a driving member (not shown) connected with the push-pull assembly 300, the driving member is used to drive the push-pull assembly 300 to move and switch between the first position and the second position, so that the falling speed of the tool 220 is more convenient to control, and the feeding and discharging of the measured object is more convenient.

[0078] Exemplarily, the driving member includes, but is not limited to, an electric push rod and a motor-driven screw slide.

[0079] In the embodiment, the pressure testing device further comprises a test box 500, and the support 100, the pressurizing assembly 200 and the push-pull assembly 300 are arranged in the test box 500. Figure 1 、 Figure 2 、 Figure 3 and Figure 6 As shown in the embodiment, the temperature and humidity in the test box can be adjusted to simulate different use environments of the to-be-tested member.

[0080] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent substitution and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A pressure testing device, characterized by, The utility model provides a kind of test device for testing the performance of the test piece, including: Support (100), the carrier (400) is equipped on the support (100), the top of the carrier (400) is equipped with the positioning slot (410) for placing the test piece; Pressurizing assembly (200), including the knife rest (210) being slid along vertical direction and being arranged on the support (100) and the cutter (220) being arranged on the knife rest (210), the cutter (220) is located above the positioning slot (410); Push-pull assembly (300), it is slid along first horizontal direction and is arranged on the support (100), the push-pull assembly (300) includes inclined column (310), the inclined column (310) is arranged at the angle with vertical direction, the push-pull assembly (300) has first position and second position along first horizontal direction sliding; In the first position, the periphery of the inclined column (310) is abutted with the knife rest (210), and the cutter (220) and the top of the carrier (400) form first clearance gap along vertical direction; In the second position, the periphery of the inclined column (310) and the knife rest (210) form second clearance gap along vertical direction, and the cutter (220) is abutted with the test piece under the gravity of the pressurizing assembly (200).

2. The pressure testing device of claim 1, wherein, The knife rest (210) includes top beam (211) and guide strip (212) being arranged at both ends of the top beam (211), the top beam (211) is arranged along second horizontal direction, the cutter (220) is arranged on the top beam (211), and the guide strip (212) is arranged along vertical direction; The support (100) is equipped with guide channel (101) corresponding to the guide strip (212), and the guide strip (212) is slid through the guide channel (101).

3. The pressure testing device of claim 2, wherein, The support (100) includes support member (110), the support member (110) is equipped with open slot on both sides along second horizontal direction, first roller (120) is arranged between two opposite side walls of the open slot, guide channel (101) is formed between the first roller (120) and the open slot, and the periphery of the guide strip (212) is abutted with corresponding first roller (120).

4. The pressure testing device of claim 3, wherein, The support member (110) is equipped with guide block (111) on both sides along second horizontal direction, and the guide block (111) is equipped with the open slot.

5. The pressure testing device of claim 2, wherein, The knife rest (210) further includes bottom beam (213), the bottom beam (213) and the top beam (211) are spaced apart along vertical direction, and clearance channel is formed between the bottom beam (213), the top beam (211) and the guide strip (212), and the carrier (400) is arranged through the clearance channel; Wherein, in the first position, the periphery of the bottom beam (213) is abutted with the inclined column (310); In the second position, the periphery of the bottom beam (213) and the inclined column (310) form the second clearance gap.

6. The pressure testing device of claim 2, wherein, The tool holder (210) further comprises a bottom crossbeam (213) which is spaced apart from the top crossbeam (211) in a vertical direction, and a clearance channel is enclosed among the bottom crossbeam (213), the top crossbeam (211) and the guide bar (212), the carrier (400) is arranged in the clearance channel, and a second roller (230) is rotatably connected to the bottom crossbeam (213); In the first position, the second roller (230) abuts against the periphery of the inclined column (310); In the second position, the second roller (230) and the periphery of the inclined column (310) form the second clearance gap.

7. The pressure testing device of claim 1, wherein, The bracket (100) comprises a guide sleeve (150), the push-pull assembly (300) further comprises a guide rod (320), a first end of the guide rod (320) is provided with a stop block (330), and a second end of the guide rod (320) is slidably arranged in the guide sleeve (150) in a first horizontal direction and connected with the inclined column (310).

8. The pressure testing device of claim 1, wherein, The pressurizing assembly (200) further comprises a counterweight (240), and the counterweight (240) is detachably connected with the tool holder (210).

9. The pressure testing device of claim 1, wherein, Further comprising a driving member connected with the push-pull assembly (300), and the driving member is used to drive the push-pull assembly (300) to move and switch between the first position and the second position.

10. The pressure testing device of any one of claims 1-9, wherein, A plurality of carriers (400) are arranged in a second horizontal direction on the bracket (100), the pressurizing assembly (200) is provided with a plurality of pressurizing assemblies (200) and is arranged in one-to-one correspondence with the carriers (400), the push-pull assembly (300) comprises a plurality of inclined columns (310) corresponding to the carriers (400) in one-to-one correspondence, and the push-pull assembly (300) further comprises a push-pull handle (340) connected with all the inclined columns (310).

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