Combined type pressure maintaining and releasing structure for negative pressure type climbing suction cup

Abstract

The invention belongs to the technical field of negative pressure suction cups, and particularly relates to a combined type pressure maintaining and pressure relief structure for a negative pressure type climbing suction cup, the pressure maintaining and pressure relief structure has two states during use, during pressure maintaining, a trigger component drives a control component to be disconnected, at the moment, the control component is disconnected with a power component, and the power component is connected with the power component; the first pressure relief hole is sealed through the pressure relief and pressure maintaining component, meanwhile, the pressure relief and pressure maintaining component is prevented from moving through the arrangement of the limiting component, the first pressure relief hole is always in a sealed state, pressure relief of the negative pressure suction cup caused by mistaken touch of workers is avoided, and the safety of the workers is guaranteed. During pressure relief, the triggering component drives the control component to be closed, the control component is connected with the power component, meanwhile, the limiting component does not stop the pressure relief and pressure maintaining component from moving any more, the control component controls the power component to move so that the first pressure relief holes can be opened, pressure relief is completed, the multiple first pressure relief holes are formed, the pressure relief speed is high, and the climbing operation time is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of negative pressure suction cups, and in particular relates to a composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup. Background Art

[0002] Negative pressure climbing suction cups have the characteristics of strong adsorption force and wide environmental applicability. They are less restricted by the wall surface material and are suitable for materials such as glass, metal, and wood.

[0003] The negative pressure of the negative pressure climbing suction cup mainly uses a vacuum pump or fan to generate negative pressure, which is adsorbed on the surface of the object through the low-pressure area inside the suction cup, thereby achieving a firm attachment. When the climbing suction cup needs to be released, the operator controls the vacuum pump and the pressure relief valve to quickly release the negative pressure inside the suction cup, thereby separating the climbing suction cup from the object.

[0004] In order to ensure the safety of climbing operations and shorten the time of climbing operations, a composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup is proposed. Summary of the invention

[0005] The object of the present invention is to provide a composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup to solve the above-mentioned problem.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup, comprising: a valve body, fixedly mounted on the negative pressure suction cup, a plurality of first pressure-relieving holes being opened on the valve body, a pressure-relieving and pressure-maintaining component being arranged on the valve body, the pressure-relieving and pressure-maintaining component being arranged corresponding to the first pressure-relieving holes, the pressure-relieving and pressure-maintaining component being transmission-connected with a power component, the pressure-relieving and pressure-maintaining component being used to close / open the first pressure-relieving holes, the power component being electrically connected with a control component, a trigger component being arranged on the valve body, the trigger component being transmission-connected with the control component, and a limiting component being arranged between the pressure-relieving and pressure-maintaining component and the trigger component;

[0008] During pressure relief, the trigger component drives the control component to close, and the power component drives the pressure relief and pressure maintaining component to relieve pressure;

[0009] When maintaining pressure, the trigger component drives the control component to disconnect, the limiting component limits the movement of the pressure relief and pressure maintenance component, and the pressure relief and pressure maintenance component maintains pressure.

[0010] In the composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup of the present invention, an installation cavity is opened on the valve body, and a plurality of the first pressure-relief holes are opened at the bottom of the installation cavity. The plurality of the first pressure-relief holes are arranged at equal intervals in the circumferential direction, and a plurality of annular grooves are opened at the bottom of the installation cavity. The plurality of annular grooves are arranged one-to-one with the plurality of the first pressure-relief holes, and a sealing ring is arranged in the annular groove.

[0011] In the composite pressure maintaining and relief structure for a negative pressure climbing suction cup of the present invention, the pressure relief and pressure maintaining component includes a valve, which is arranged in the installation cavity, and a plurality of second pressure relief holes are circumferentially evenly spaced on the valve, and the plurality of second pressure relief holes are arranged one-to-one and matched with the plurality of first pressure relief holes, and the distance between two adjacent first pressure relief holes is greater than the diameter of the second pressure relief hole, and the valve abuts against the sealing ring, and the side of the valve extending out of the installation cavity abuts against an end cover, and the end cover is fixedly connected to the valve body.

[0012] In the composite pressure-maintaining and pressure-relieving structure for the negative pressure climbing suction cup of the present invention, the triggering member includes a track fixedly connected to one side of the valve body, one end of the track is fixedly connected to two third protrusions, the two third protrusions are symmetrically arranged, a hinge block is slidably connected between the two third protrusions, the hinge block is detachably connected to the control member, a penetrating hinge groove is provided on the hinge block, and the two third protrusions extend into the hinge groove respectively;

[0013] A safety rod is fixedly connected to one end of the hinge block, the safety rod is arranged on the track, one end of the safety rod away from the hinge block is slidably connected in a limit block, the limit block is fixed to the track, and one end of the safety rod passing through the limit block is connected to a traction member;

[0014] A spring is sleeved on the outer side of the safety pull rod, and two ends of the spring are respectively in contact with the hinge block and the limit block.

[0015] In the composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup of the present invention, the limiting member includes a second connecting rod, one end of the second connecting rod is hinged in the hinge groove, the other end of the second connecting rod is hinged to one end of the first connecting rod, the other end of the first connecting rod is rotatably connected to the valve body and fixedly connected to a second protrusion, the valve is fixedly connected to a first protrusion, and the first protrusion is correspondingly arranged to the second protrusion.

[0016] In the composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup of the present invention, the power component includes a mounting frame fixedly connected to the end cover, a servo motor is fixedly connected to the mounting frame, an output shaft of the servo motor is coaxially fixedly connected to a connecting seat, and the connecting seat is coaxially fixedly connected to the valve.

[0017] In the composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup of the present invention, the control component includes a control switch fixedly connected to the valve body, the control end of the control switch is arranged corresponding to the hinge block, and the control switch is electrically connected to the servo and the pressure relief button.

[0018] In the composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup of the present invention, one end of the safety pull rod extending out of the limit block is provided with a threaded section, the threaded section is threadedly connected with a traction joint, and the traction joint is connected to the traction member.

[0019] In the composite pressure-maintaining and pressure-relieving structure for the negative pressure climbing suction cup of the present invention, a step is provided on the safety pull rod, the diameter of the step is larger than the diameter of the safety pull rod, and the step and the limit block work together to limit the maximum stroke of the safety pull rod.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The pressure-maintaining and pressure-relieving structure of the present invention is divided into two states when in use. When maintaining pressure, the trigger component drives the control component to disconnect, at which time the control component is disconnected from the power component, and the pressure-relieving and pressure-maintaining component closes the first pressure-relieving hole. At the same time, the setting of the limiting component prevents the pressure-relieving and pressure-maintaining component from moving, so that the first pressure-relieving hole is always in a closed state, avoiding accidental touch by the staff causing the negative pressure suction cup to release pressure, thereby ensuring the safety of the staff;

[0022] When the pressure is released, the trigger component drives the control component to close, and the control component is connected to the power component. At the same time, the limiting component no longer prevents the movement of the pressure relief and pressure maintaining component. The control component controls the movement of the power component to open the first pressure relief hole to complete the pressure relief. In addition, there are multiple first pressure relief holes, and the pressure relief speed is fast, which shortens the time of climbing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0024] Figure 1 It is the installation schematic diagram of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the present invention;

[0026] Figure 3 It is a state diagram of the present invention during pressure relief;

[0027] Figure 4This is a state diagram of the present invention when maintaining pressure;

[0028] Among them, 1. negative pressure suction cup; 2. valve body; 3. first pressure relief hole; 4. third protrusion; 5. annular groove; 6. installation cavity; 7. track; 8. limit block; 9. traction joint; 10. valve; 11. second pressure relief hole; 12. first protrusion; 13. connecting seat; 14. end cover; 15. mounting frame; 16. servo; 17. control switch; 18. first connecting rod; 19. safety pull rod; 20. threaded section; 21. spring; 22. step; 23. second connecting rod; 24. hinge block; 25. hinge groove; 26. second protrusion; 27. sealing ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 4 The present invention discloses a composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup, comprising: a valve body 2, fixedly mounted on a negative pressure suction cup 1, a plurality of first pressure-relieving holes 3 are provided on the valve body 2, a pressure-relieving and pressure-maintaining component is provided on the valve body 2, the pressure-relieving and pressure-maintaining component is provided corresponding to the first pressure-relieving holes 3, the pressure-relieving and pressure-maintaining component is transmission-connected with a power component, the pressure-relieving and pressure-maintaining component is used to close / open the first pressure-relieving holes 3, the power component is electrically connected with a control component, a trigger component is provided on the valve body 2, the trigger component is transmission-connected with the control component, and a limiting component is provided between the pressure-relieving and pressure-maintaining component and the trigger component;

[0032] When releasing pressure, the trigger component drives the control component to close, and the power component drives the pressure relief and pressure maintaining component to release pressure;

[0033] When maintaining pressure, the trigger component drives the control component to disconnect, the limiting component limits the movement of the pressure relief and pressure maintaining component, and the pressure relief and pressure maintaining component maintains pressure.

[0034] The pressure-maintaining and pressure-relieving structure of the present invention is divided into two states when in use. When maintaining pressure, the trigger component drives the control component to disconnect, at which time the control component is disconnected from the power component, and the pressure-relieving and pressure-maintaining component closes the first pressure-relieving hole 3. At the same time, the setting of the limiting component prevents the pressure-relieving and pressure-maintaining component from moving, so that the first pressure-relieving hole 3 is always in a closed state, avoiding accidental touch by the staff causing the negative pressure suction cup 1 to release pressure, thereby ensuring the safety of the staff;

[0035] When the pressure is released, the trigger component drives the control component to close, and the control component is connected to the power component. At the same time, the limiting component no longer prevents the movement of the pressure relief and pressure maintaining component. The control component controls the movement of the power component to open the first pressure relief hole 3 to complete the pressure relief. There are multiple first pressure relief holes 3, and the pressure relief speed is fast, which shortens the time of the climbing operation.

[0036] In an optional scheme, an installation cavity 6 is opened on the valve body 2, and multiple first pressure relief holes 3 are opened at the bottom of the installation cavity 6. The multiple first pressure relief holes 3 are arranged at equal intervals in the circumferential direction. A plurality of annular grooves 5 are opened at the bottom of the installation cavity 6. The multiple annular grooves 5 are arranged one-to-one corresponding to the multiple first pressure relief holes 3, and a sealing ring 27 is arranged in the annular groove 5.

[0037] In an optional solution, the pressure relief and pressure maintaining component includes a valve 10, which is arranged in the installation cavity 6. A plurality of second pressure relief holes 11 are circumferentially evenly spaced on the valve 10. The plurality of second pressure relief holes 11 are arranged one-to-one in correspondence with and adapted to the plurality of first pressure relief holes 3. The distance between two adjacent first pressure relief holes 3 is greater than the diameter of the second pressure relief holes 11. The valve 10 abuts against the sealing ring 27. The side of the valve 10 extending out of the installation cavity 6 abuts against the end cover 14, and the end cover 14 is fixedly connected to the valve body 2.

[0038] The valve 10 abuts against the sealing ring 27 under the pressure of the end cover 14, thereby ensuring the sealing effect during pressure maintenance;

[0039] The second pressure relief hole 11 has the same inner diameter as the first pressure relief hole 3;

[0040] In an optional solution, the trigger member includes a track 7 fixed to one side of the valve body 2, one end of the track 7 is fixed with two third protrusions 4, the two third protrusions 4 are symmetrically arranged along the axis of the track 7, a hinge block 24 is slidably connected between the two third protrusions 4, the hinge block 24 is detachably connected to the control member, a penetrating hinge groove 25 is opened on the hinge block 24, and the two third protrusions 4 extend into the hinge groove 25 respectively;

[0041] The two third protrusions 4 extend into the hinge grooves 25 respectively, so that the hinge block 24 can only move along the length direction of the track 7, ensuring the stability of the movement;

[0042] One end of the hinge block 24 is fixedly connected with a safety rod 19, which is arranged on the track 7. One end of the safety rod 19 away from the hinge block 24 is slidably connected in the limit block 8, which is fixedly connected to the track 7. One end of the safety rod 19 passing through the limit block 8 is connected with a traction member.

[0043] The traction member is used to apply a pulling force to the safety rod 19 so that the safety rod 19 cannot move in the pressure-maintaining state, and the negative pressure suction cup 1 always maintains a negative pressure state. The traction member can be selected by technicians in this field according to their own needs.

[0044] A spring 21 is sleeved on the outer side of the safety pull rod 19 , and two ends of the spring 21 are respectively in contact with the hinge block 24 and the limit block 8 .

[0045] The function of the spring 21 is to automatically reset the safety rod 19 when the safety rod 19 is disconnected from the traction member.

[0046] In an optional solution, the limiting member includes a second connecting rod 23, one end of the second connecting rod 23 is hinged in the hinge groove 25, the other end of the second connecting rod 23 is hinged to one end of the first connecting rod 18, the other end of the first connecting rod 18 is rotatably connected to the valve body 2 and fixedly connected to the second protrusion 26, the first protrusion 12 is fixedly connected to the valve 10, and the first protrusion 12 and the second protrusion 26 are arranged correspondingly.

[0047] The safety pull rod 19 is connected to the traction member. At this time, the hinge block 24 is separated from the control end of the control switch 17, and the control switch 17 is disconnected. At the same time, the safety pull rod 19 drives the first connecting rod 18 to rotate through the second connecting rod 23. The movement of the first connecting rod 18 connects the second protrusion 26 with the first protrusion 12, and the valve 10 is limited to prevent the valve 10 from rotating and releasing pressure due to the failure of the steering gear 16, which may cause danger.

[0048] The safety pull rod 19 is disconnected from the traction member, and the spring 21 automatically resets the safety pull rod 19. At this time, the hinge block 24 contacts the control end of the control switch 17, so that the control switch 17 is closed, and the pressure relief button is connected to the steering gear 16. At the same time, the safety pull rod 19 drives the first connecting rod 18 to rotate through the second connecting rod 23. The movement of the first connecting rod 18 separates the second protrusion 26 from the first protrusion 12, and the limit on the valve 10 is released. The pressure relief button controls the movement of the steering gear 16 to open the first pressure relief hole 3;

[0049] In an optional solution, the power component includes a mounting frame 15 fixedly connected to the end cover 14 , a servo 16 is fixedly connected to the mounting frame 15 , an output shaft of the servo 16 is coaxially fixedly connected to a connecting seat 13 , and the connecting seat 13 is coaxially fixedly connected to the valve 10 .

[0050] The valve 10 is driven to rotate by the steering gear 16 to close / open the first pressure relief hole 3 .

[0051] In an optional solution, the control component includes a control switch 17 fixed to the valve body 2, a control end of the control switch 17 is arranged corresponding to the hinge block 24, and the control switch 17 is electrically connected to the steering gear 16 and the pressure relief button.

[0052] When the control switch 17 is closed, the pressure relief button is connected to the steering gear 16, and the pressure relief button controls the movement of the steering gear 16. When the control switch 17 is opened, the pressure relief button is disconnected from the steering gear 16, and the pressure relief button cannot control the movement of the steering gear 16.

[0053] In an optional solution, a threaded section 20 is provided at one end of the safety pull rod 19 extending out of the limit block 8, and the threaded section 20 is threadedly connected with a traction joint 9, and the traction joint 9 is connected to the traction member.

[0054] The traction joint 9 is used to connect the safety pull rod 19 and the traction member.

[0055] In an optional solution, a step 22 is provided on the safety rod 19 , the diameter of the step 22 is larger than the diameter of the safety rod 19 , and the step 22 and the limit block 8 work together to limit the maximum stroke of the safety rod 19 .

[0056] A step 22 is provided on the safety rod 19, and the diameter of the step 22 is larger than the diameter of the safety rod 19. The setting of the step 22 forms a limit for the safety rod 19, and the traction joint 9 forms another limit. The step 22 works together with the traction joint 9 and the limit block 8 to ensure that the safety rod 19 always moves within the set range, avoiding the structural failure of the present invention caused by excessive movement range.

[0057] At the same time, by adjusting the length of the safety pull rod 19 screwed into the limit block 8, the rebound stroke of the safety pull rod 19 can be adjusted.

[0058] Working status:

[0059] Maintaining pressure: The safety pull rod 19 is connected to the traction member through the traction joint 9. At this time, the step 22 abuts against the limit block 8, the hinge block 24 is separated from the control end of the control switch 17, and the control switch 17 is disconnected. At the same time, the safety pull rod 19 drives the first connecting rod 18 to rotate through the second connecting rod 23. The movement of the first connecting rod 18 connects the second protrusion 26 with the first protrusion 12, and the valve 10 is limited to avoid the failure of the steering gear 16 to drive the valve 10 to rotate and release pressure, which may cause danger;

[0060] Pressure relief: the traction joint 9 is disconnected from the traction member, and the spring 21 automatically resets the safety pull rod 19. At this time, the hinge block 24 contacts the control end of the control switch 17 to close the control switch 17, and the pressure relief button is connected to the steering gear 16. At the same time, the safety pull rod 19 drives the first connecting rod 18 to rotate through the second connecting rod 23. The movement of the first connecting rod 18 separates the second protrusion 26 from the first protrusion 12, releasing the limit on the valve 10. The pressure relief button controls the movement of the steering gear 16 to open the first pressure relief hole 3 for pressure relief.

[0061] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup, characterized in that: include: The valve body (2) is fixedly mounted on the negative pressure suction cup (1), the valve body (2) is provided with a plurality of first pressure relief holes (3), the valve body (2) is provided with a pressure relief and pressure maintaining component, the pressure relief and pressure maintaining component is arranged corresponding to the first pressure relief hole (3), the pressure relief and pressure maintaining component is transmission-connected with a power component, the pressure relief and pressure maintaining component is used to close / open the first pressure relief hole (3), the power component is electrically connected with a control component, the valve body (2) is provided with a trigger component, the trigger component is transmission-connected with the control component, and a limiting component is arranged between the pressure relief and pressure maintaining component and the trigger component; During pressure relief, the trigger component drives the control component to close, and the power component drives the pressure relief and pressure maintaining component to relieve pressure; When maintaining pressure, the trigger component drives the control component to disconnect, the limiting component limits the movement of the pressure relief and pressure maintenance component, and the pressure relief and pressure maintenance component maintains pressure.

2. A composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 1, characterized in that: The valve body (2) is provided with an installation cavity (6), and a plurality of the first pressure relief holes (3) are all provided at the bottom of the installation cavity (6). The plurality of the first pressure relief holes (3) are arranged at equal intervals in the circumferential direction. A plurality of annular grooves (5) are provided at the bottom of the installation cavity (6), and the plurality of annular grooves (5) are arranged in a one-to-one correspondence with the plurality of the first pressure relief holes (3). A sealing ring (27) is provided in the annular groove (5).

3. A composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 2, characterized in that: The pressure relief and pressure maintaining component comprises a valve (10), the valve (10) being arranged in the installation cavity (6), a plurality of second pressure relief holes (11) being circumferentially evenly spaced on the valve (10), the plurality of second pressure relief holes (11) being arranged one-to-one correspondingly and matching with the plurality of first pressure relief holes (3), the distance between two adjacent first pressure relief holes (3) being greater than the diameter of the second pressure relief holes (11), the valve (10) being in contact with the sealing ring (27), the side of the valve (10) extending out of the installation cavity (6) being in contact with an end cover (14), and the end cover (14) being fixedly connected to the valve body (2).

4. The composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 3, characterized in that: The trigger member comprises a track (7) fixedly connected to one side of the valve body (2), one end of the track (7) being fixedly connected to two third protrusions (4), the two third protrusions (4) being symmetrically arranged, a hinge block (24) being slidably connected between the two third protrusions (4), the hinge block (24) being detachably connected to the control member, a penetrating hinge groove (25) being provided on the hinge block (24), the two third protrusions (4) respectively extending into the hinge groove (25); One end of the hinge block (24) is fixedly connected to a safety pull rod (19), the safety pull rod (19) is arranged on the track (7), one end of the safety pull rod (19) away from the hinge block (24) is slidably connected in a limit block (8), the limit block (8) is fixedly connected to the track (7), and one end of the safety pull rod (19) passing through the limit block (8) is connected to a traction member; A spring (21) is sleeved on the outer side of the safety pull rod (19), and two ends of the spring (21) are respectively in contact with the hinge block (24) and the limit block (8).

5. A composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 4, characterized in that: The limiting member comprises a second connecting rod (23), one end of the second connecting rod (23) is hinged in the hinge groove (25), the other end of the second connecting rod (23) is hinged to one end of a first connecting rod (18), the other end of the first connecting rod (18) is rotatably connected to the valve body (2) and is fixedly connected to a second protrusion (26), the valve (10) is fixedly connected to a first protrusion (12), and the first protrusion (12) and the second protrusion (26) are arranged correspondingly.

6. The composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 4, characterized in that: The power component comprises a mounting frame (15) fixedly connected to the end cover (14), a steering gear (16) being fixedly connected to the mounting frame (15), an output shaft of the steering gear (16) being coaxially fixedly connected to a connecting seat (13), and the connecting seat (13) being coaxially fixedly connected to the valve (10).

7. A composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 6, characterized in that: The control component comprises a control switch (17) fixedly connected to the valve body (2), a control end of the control switch (17) being arranged corresponding to the hinge block (24), and the control switch (17) being electrically connected to the steering gear (16) and a pressure relief button.

8. The composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 4, characterized in that: One end of the safety pull rod (19) extending out of the limit block (8) is provided with a threaded section (20), the threaded section (20) is threadedly connected to a traction joint (9), and the traction joint (9) is connected to the traction member.

9. The composite pressure-maintaining and pressure-relieving structure for a negative pressure climbing suction cup according to claim 4, characterized in that: The safety pull rod (19) is provided with a step (22), the diameter of the step (22) is larger than the diameter of the safety pull rod (19), and the step (22) and the limit block (8) work together to limit the maximum travel of the safety pull rod (19).

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