CN210683098U

CN210683098U - Protection device and forklift

Info

Publication number: CN210683098U
Application number: CN201921737070.XU
Authority: CN
Inventors: 李晓伟; 肖玉辉; 杨宁宁
Original assignee: Beijing Geekplus Technology Co Ltd
Current assignee: Beijing Jizhijia Technology Co Ltd
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2020-06-05
Anticipated expiration: 2029-10-16

Abstract

The utility model belongs to the technical field of fork truck, specifically disclose a protector and fork truck, wherein protector for get on the goods mechanism, include: the switch structure is arranged on the goods taking mechanism and is configured to control the goods taking mechanism to stop lifting when being triggered; the protection structure comprises a bearing part, the bearing part is arranged on the goods taking mechanism and protrudes out of the upper surface and the lower surface of the goods taking mechanism, and the bearing part is configured to be capable of moving relative to the goods taking mechanism to trigger the switch structure when being pressed. The utility model discloses a protector and fork truck can reduce protector's misjudgement probability, has improved fork truck safe operation's stability and reliability.

Description

Protection device and forklift

Technical Field

The utility model relates to a fork truck technical field especially relates to a protector for be used for fork truck.

Background

The rapid development of electronic commerce brings unprecedented development opportunities to the warehouse logistics industry and also provides serious challenges to warehouse logistics services. How to safely and efficiently carry and stack the shelves is always a difficult problem in the industry.

The use of the unmanned forklift solves the problems of high labor intensity, difficult recruitment and the like in the traditional warehouse logistics industry. In order to carry out bidirectional protection to fork and goods shelves among current unmanned fork truck, all add and be equipped with fork lift protector, it mainly includes photoelectric sensing element, distancer and scanner etc. has promoted fork truck's intellectuality and automation. However, the electronic components generally have the disadvantages of high misjudgment probability and low reliability in the using process. If the influence of dust in the air or sundries around the dust in the process of carrying the goods shelf by the forklift causes the fork lifting protection device to generate misjudgment, the collision damage of the goods shelf and the forklift is caused in the process of carrying or stacking the goods shelf by the unmanned forklift, even the goods on the goods shelf can be damaged, and the safe operation and the carrying efficiency of the forklift are greatly influenced.

Therefore, a protection device with reliable performance and compact structure is needed to protect the safe and efficient operation of the forklift.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a protector, compact structure just can improve the probability that protector accuracy was judged and the reliability to the fork protection.

Another object of the utility model is to provide a fork truck improves the probability of the accurate judgement of fork truck and the reliability to fork truck protection.

To achieve the purpose, the technical proposal adopted by the utility model is that:

a guard for use with a pick-up mechanism, comprising: the switch structure is arranged on the goods taking mechanism and is configured to control the goods taking mechanism to stop lifting when being triggered; the protection structure comprises a bearing part, the bearing part is arranged on the goods taking mechanism and protrudes out of the upper surface and the lower surface of the goods taking mechanism, and the bearing part is configured to be capable of moving relative to the goods taking mechanism to trigger the switch structure when being pressed.

Further, protective structure still includes the subassembly that resets, the subassembly that resets includes the mounting and follows the elastic component that the direction of motion of getting goods mechanism extends, elastic component one end butt or rigid coupling in the mounting, other end butt or rigid coupling in the bearing part, the elastic component is configured to support the bearing part protrusion in get goods mechanism's upper and lower surface.

Further, protective structure still includes the direction subassembly, the direction subassembly includes the edge the guide post that the direction of motion of getting goods mechanism extends, guide post one end rigid coupling in the mounting, seted up the confession on the pressure-bearing piece the wear to establish the hole that the guide post passed.

Further, one end of the guide column, which is far away from the fixing part, is provided with a limiting part, and the limiting part is configured to limit the stroke of the pressure-bearing part in the moving direction of the goods taking mechanism.

Further, the bearing piece includes first bearing piece, first bearing piece set up in get on the lateral wall of goods platform of getting of goods mechanism get in the direction of motion of goods mechanism, first bearing piece has primary importance and second place, works as first bearing piece is located when the primary importance, the upper surface of first bearing piece surpasss get the goods platform upper surface, works as first bearing piece is located when the second place, first bearing piece can trigger switch structure.

Further, the bearing piece still includes second bearing piece, second bearing piece set up in get on the lateral wall of goods platform, second bearing piece with first bearing piece sets up relatively and is located first bearing piece below get on the direction of motion of goods mechanism, second bearing piece has third position and fourth position, works as second bearing piece is located when the third position, the lower surface of second bearing piece surpasss get the goods platform lower surface, works as second bearing piece is located when the fourth position, second bearing piece can trigger the switch structure.

Further, the switch structure includes first switch spare and second switch spare, first switch spare with the second switch spare all is located first bearing spare with between the second bearing spare, when first bearing spare is located when the second position, first bearing spare can trigger first switch spare, when the second bearing spare is located when the fourth position, the second bearing spare can trigger the second switch spare.

Further, the first switch member and the second switch member are both microswitches.

A forklift includes a pickup mechanism and a guard as described above.

Further, get cargo aircraft structure including getting the goods platform, it does to get the goods platform fork of fork truck, protective structure with switch structure all set up in on the fork.

The utility model has the advantages that:

the utility model provides a protector, through the bearing part pressurized trigger switch structure in order to realize getting goods mechanism and stop to mechanical protection device replacement electronic induction protector, compact structure has greatly improved the probability that protector accurately judged, has improved protector's reliability.

The utility model provides a fork truck through adopting above-mentioned protector, can improve the accurate probability of judging of fork truck, the effectual safety of protecting fork truck has improved the reliability of fork truck operation.

Drawings

Fig. 1 is a schematic structural diagram of a forklift truck provided by the present invention;

fig. 2 is a schematic structural diagram of the protection device provided by the present invention;

fig. 3 is a schematic structural view of the pressure-bearing member provided by the present invention;

fig. 4 is a partially enlarged view of a portion a in fig. 2.

In the figure:

10. a forklift; 20. a goods taking mechanism; 201. a goods taking platform; 30. a control device; 40. a base; 401. a threading opening; 50. a guard;

1. a protective structure; 11. a pressure-bearing member; 111. a first bearing member; 112. a second pressure bearing member; 113. perforating holes; 12. a reset assembly; 121. a fixing member; 122. an elastic member; 13. a guide assembly; 131. a guide post; 132. a limiting member;

2. a switch structure; 21. a first switching member; 22. a second switching member.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Fig. 1 provides a forklift 10 according to the present embodiment, where the forklift 10 includes a pickup mechanism 20, a guard device 50 and a control device 30, where the guard device 50 includes a guard structure 1 and a switch structure 2, as shown in fig. 2. The goods taking mechanism 20 comprises a goods taking platform 201, the goods taking platform 201 is a fork of the forklift 10, and the protection device 50 is installed on one side of the fork.

In order to improve the safety of the forklift 10 for carrying objects, an electronic protection device is generally additionally arranged in the existing forklift 10 and mainly comprises electronic components such as a photoelectric sensor, a distance measuring sensor, a scanner and the like. Such electronic safeguards have increased the intelligence and automation of the truck 10. However, due to the performance influence of the electronic components, the electronic protection device generally has high misjudgment probability, and is easy to cause the forklift 10 to suddenly stop or lose control, so that the safety of the forklift 10 and the conveyed objects cannot be effectively guaranteed.

To solve the above problem, the present embodiment provides a protection device 50 with compact structure and reliable performance. As shown in fig. 1-3, the guard device 50 is mounted to the pickup mechanism 20 and includes a switch structure 2 and a guard structure 1. Wherein protective structure 1 includes pressure-bearing piece 11, and pressure-bearing piece 11 sets up on getting goods mechanism 20 and protrusion in the upper and lower surface of getting goods mechanism 20, and when pressure-bearing piece 11 received external force extrusion, can follow the direction of motion of getting goods mechanism 20 and move for getting goods mechanism 20, and switch structure 2 triggers and makes the stop motion of getting goods mechanism 20 under the extrusion of pressure-bearing piece 11 this moment.

In this embodiment, the pressure-bearing part 11 of the protection device 50 is extruded by an external force and can slide relative to the goods taking mechanism 20 along the vertical direction, so as to trigger the switch structure 2, and the switch structure 2 triggers the control device 30 on the forklift 10 to send an instruction to stop the goods taking mechanism 20, thereby preventing the goods taking mechanism 20 from colliding with a goods shelf or other sundries and protecting the safety of the forklift 10. Meanwhile, the protection device 50 is triggered by physical collision without participation of sensor elements, so that the judgment accuracy of the protection device 50 is greatly improved, the performance of the protection device 50 is reliable and stable, and the protection device 50 is compact in overall structure and easy to mount on the goods taking mechanism 20.

Optionally, to facilitate the removal and installation of the guard 50 and the subsequent maintenance replacement, the guard 50 may further include a base 40, as shown in fig. 2. The protective structure 1 and the switch structure 2 are both mounted on the base 40, and the base 40 is mounted on the side wall of the goods taking platform 201 of the goods taking mechanism 20.

It should be noted that the base 40 is further provided with a threading opening 401, so as to electrically connect the switch structure 2 with the control device 30 of the forklift 10, so as to convert the pressure applied to the pressure-bearing member 11 into an electrical signal of the control device 30 through the switch structure 2.

Specifically, the protection device 50 is disposed on one side arm of the pickup platform 201, so that the arrangement of other functional modules on the forklift 10 is not affected, and the purchasing cost and the workload of later maintenance and replacement of the forklift 10 are reduced. The number and/or mounting position of the guards 50 are determined according to the size and/or number of the picking platforms 201, and the embodiment is not particularly limited.

In this embodiment, the pressure bearing member 11 includes a first pressure bearing member 111 and a second pressure bearing member 112, and the first pressure bearing member 111 and the second pressure bearing member 112 are both disposed on the base 40. Wherein the first bearing member 111 has a first position and a second position in the moving direction of the goods taking mechanism 20, when the first bearing member 111 is located at the first position, the upper surface of the first bearing member 111 exceeds the upper surface of the goods taking platform 201, and when the first bearing member 111 is located at the second position, the first bearing member 111 can trigger the switch structure 2. The second bearing part 112 is arranged opposite to the first bearing part 111 and is located below the first bearing part 111, the second bearing part 112 has a third position and a fourth position in the vertical direction, when the second bearing part 112 is located at the third position, the lower surface of the second bearing part 112 exceeds the lower surface of the goods taking platform 201, and when the second bearing part 112 is located at the fourth position, the second bearing part 112 can trigger the switch structure 2.

Specifically, when the forklift 10 forks the goods or the shelves, and the lifting platform 201 does not contact the goods or the shelves, the first pressure-bearing member 111 and the second pressure-bearing member 112 are in the initial positions, that is, the first pressure-bearing member 111 is in the first position, and the second pressure-bearing member 112 is in the third position, at this time, the upper surface of the first pressure-bearing member 111 exceeds the upper surface of the goods taking platform 201, and the lower surface of the second pressure-bearing member 112 exceeds the lower surface of the goods taking platform 201. When the forklift 10 contacts goods or shelves, the first pressure-bearing member 111 moves relative to the goods taking platform 201 under the action of the extrusion force of the lifting platform 201 until the upper surface of the first pressure-bearing member 111 is flush with the upper surface of the goods taking platform 201, and at this time, the first pressure-bearing member 111 is in the second position, and the switch structure 2 is triggered to stop the movement of the goods taking mechanism 20. Similarly, when the forklift 10 stacks goods or shelves, the second bearing part 112 moves relative to the goods taking platform 201 under the action of the pressure of the goods or shelves until the lower surface of the second bearing part 112 is flush with the lower surface of the goods taking platform 201, and at this time, the second bearing part 112 is located at the second position, and the switch structure 2 is triggered to stop the movement of the goods taking mechanism 20.

In this embodiment, the first bearing part 111 and the second bearing part 112 are respectively disposed at different positions, so as to achieve collision protection of two movement tracks of the pickup mechanism 20 rising and falling in the movement direction of the pickup mechanism 20, and meanwhile, the mechanical collision force is used as a trigger signal, so that the reliability of the protection device 50 is improved, and the safety of the forklift 10 and goods when the forklift 10 forks or stacks goods is ensured. Moreover, the mounting of electronic components and various sensors is eliminated, so that the guard 50 is more compact than conventional electronic guards, and the weight and cost of the forklift 10 are reduced.

Optionally, the first bearing member 111 and the second bearing member 112 are plate-shaped structures and have a plurality of bending structures with different angles, respectively, so as to facilitate the assembly and disassembly of the first bearing member 111 and the second bearing member 112 on the base 40, and the first bearing member 111 and the second bearing member 112 have the same structure and size, so as to facilitate the processing and manufacturing of the components of the protection device 50. In other embodiments, the first bearing member 111 and/or the second bearing member 112 may also be in the form of blocks or columns. In order to make the layout of the guard 50 more compact, the first bearing member 111 and the second bearing member 112 may be configured as an integral plate-shaped structure, which is arranged in a "U" shape, but has a certain space requirement for the part where the shelf is forked. When the space of the forked portion of the shelf is small, the first pressure receiving member 111 and the second pressure receiving member 112 as a whole may interfere with the raising and lowering movements of the fork, thereby reducing the stability and reliability of the guard 50. Of course, the first bearing member 111 and the second bearing member 112 may have different structures and/or sizes, and only the trigger switch structure 2 may be implemented.

As shown in fig. 2, the switch structure 2 includes a first switch member 21 and a second switch member 22, the first switch member 21 and the second switch member 22 are both located between the first pressure-bearing member 111 and the second pressure-bearing member 112, when the first pressure-bearing member 111 is located at the second position, the first pressure-bearing member 111 can trigger the first switch member 21, and the goods taking mechanism 20 stops moving; when the first pressure bearing part 111 returns to the first position, the first switch part 21 is stopped to be triggered, and the goods taking mechanism 20 can continue to start to move according to actual working conditions. Similarly, when the second pressure-bearing member 112 is located at the fourth position, the second pressure-bearing member 112 can trigger the second switch member 22, and the goods taking mechanism 20 stops moving; when the second bearing part 112 returns to the third position, the triggering of the second switch part 22 is stopped, and the pick-up mechanism 20 can continue to start moving according to the actual working condition.

In this embodiment, the first pressure-bearing member 111 and the second pressure-bearing member 112 are located at different positions to trigger the first switch member 21 and the second switch member 22 to control the start and stop of the lifting motion of the goods taking mechanism 20, and the gravity or the extrusion force of the shelf is used as a trigger signal for controlling the lifting mechanism 20, so that the judgment accuracy of the protection device 50 is improved, and the goods taking mechanism 20 is protected.

Optionally, the first switch member 21 and the second switch member 22 are microswitches, and two microswitches are provided, which takes into account the procurement cost and the sensitivity of the guard device 50. The first switch 21 and the second switch 22 may also be in the form of other switches such as a touch switch, and the switch structure 2 capable of triggering and automatically resetting is a conventional technical means in the basic field, and this embodiment is not described in detail herein. In other embodiments, the switch structure 2 may also be designed to have a dual-triggering structure, and only one dual-triggering switch structure 2 needs to be disposed between the first pressure-bearing member 111 and the second pressure-bearing member 112, which reduces the sensitivity of the protection device 50 while saving procurement cost. Of course, the first switch member 21 and the second switch member 22 may be provided in plural numbers, respectively, to improve the sensitivity of the guard device 50.

It should be noted that the first bearing member 111 and the second bearing member 112 are disposed in a staggered manner in the vertical direction, and the first switch member 21 and the second switch member 22 are also disposed in a staggered manner in the moving direction of the goods taking mechanism 20, so that the occupied space of the protection device 50 is saved, the overall layout of the protection device 50 is more compact, and the protection device 50 is conveniently mounted on the base 40. The size and arrangement of the pressure bearing member 11 and the switch structure 2 are determined according to the structure or size of the base 40, and the present embodiment is not particularly limited.

As shown in fig. 4, in order to realize that the first pressure-bearing member 111 and the second pressure-bearing member 112 are respectively capable of moving relative to the pickup mechanism 20 in the moving direction of the pickup mechanism 20 and can be automatically reset, the protective structure 1 further includes a reset assembly 12 and a guide assembly 13.

In this embodiment, four reset assemblies 12 are provided, two of the reset assemblies 12 are respectively disposed at two ends of the first pressure-bearing member 111, and the other two reset assemblies 12 are respectively disposed at two ends of the second pressure-bearing member 112. The guide assemblies 13 are the same in number and correspond to the reset assemblies 12 one by one. For ease of understanding, the following explanation of the structure and operation of the reset assembly 12 and the pilot assembly 13 will be given by taking the reset assembly 12 and the pilot assembly 13 disposed at one end of the first bearing member 111 as an example.

The reset assembly 12 includes a fixing member 121 and an elastic member 122 extending along the moving direction of the goods taking mechanism 20, one end of the elastic member 122 abuts against or is fixed to the fixing member 121, the other end of the elastic member 122 abuts against or is fixed to the first bearing member 111, and the elastic member 122 can drive the first bearing member 111 to return to the first position.

The guiding assembly 13 includes a guiding column 131 extending along the moving direction of the goods taking mechanism 20, one end of the guiding column 131 is fixedly connected to the fixing member 121, a through hole 113 for the guiding column 131 to pass through is formed on the first bearing member 111, and the first bearing member 111 is slidably disposed on the guiding column 131 through the through hole 113, as shown in fig. 3 and 4.

In this embodiment, the fixing member 121 is fixedly disposed on the base 40, the fixing member 121 is specifically a square block structure, the elastic member 122 is specifically a spring and is sleeved on the guiding post 131, the first pressure-bearing member 111 can slide and reset along the guiding post 131 in the vertical direction under the action of the elastic member 122 to trigger the switch structure 2, the pressure applied to the first pressure-bearing member 111 is converted into an electrical signal of the switch structure 2, and the determination accuracy and reliability of the protection device 50 are greatly improved.

In other embodiments, the fixing member 121 may also be a polygonal plate or a cylindrical structure. The elastic member 122 may be provided on the fixing member 121 separately from the guide post 131, and the elastic member 122 may be provided in plurality in order to improve the efficiency of the restoration of the first bearing member 111.

In order to limit the movement stroke of the first bearing member 111 in the movement direction of the goods taking mechanism 20, a limiting member 132 is disposed at an end of the guiding column 131 away from the fixing member 121, and the limiting member 132 is used for limiting the stroke of the first bearing member 111 in the movement direction of the goods taking mechanism 20, as shown in fig. 4.

In this embodiment, the limiting member 132 is specifically a nut, a thread is correspondingly disposed on the guiding post 131, and when the pressure-bearing member 11 is at the initial position, the limiting member 132 abuts against the first pressure-bearing member 111.

In other embodiments, when the first bearing member 111 returns to the initial position, the limiting member 132 may not contact with the first bearing member 111. Meanwhile, the limiting member 132 may also be a block-shaped or plate-shaped structure, and may be welded or riveted with the guide post 131, and the structure capable of realizing the fixed connection is a conventional technical means in the art, which is not described in detail in this embodiment.

For convenience of understanding, the working principle of the protection device 50 provided by the embodiment of the present invention is:

the work flow of the forklift 10 for picking up the pallet or goods is as follows: the fork lift truck 10 controls the insertion of the forks into the pallet by means of the control device 30, with the first abutment member 111 in the first position and the second abutment member 112 in the third position. During the fork lifting process, the first pressure-bearing member 111 first contacts the rack, under the action of the extrusion force of the rack or the goods, the first pressure-bearing member 111 overcomes the elastic force of the elastic member 122 and descends along the guide rod 131 in the moving direction of the goods taking mechanism 20, when the upper surface of the first pressure-bearing member 111 is flush with the upper surface of the fork, the first pressure-bearing member stops descending and triggers the first switch member 21, the first switch member 21 converts the extrusion force of the first pressure-bearing member 111 into an electric signal and transmits the electric signal to the control device 30, and the control device 30 controls the fork to stop lifting after a preset delay time, so that the fork lifting of the rack or the goods is completed.

The work flow of the forklift 10 for stacking the goods shelves or the goods is as follows: after the forklift 10 carries the pallet to the designated position, the control device 30 controls the pallet to descend along the moving direction of the goods taking mechanism 20 to stack the pallet to the designated position, at this time, the first pressure bearing member 111 is reset to the first position, and the second pressure bearing member 112 is located at the third position. During the descending process of the fork, the second pressure-bearing member 112 firstly contacts the goods shelf or the ground, and as the fork descends, under the action of the pressing force of the goods shelf or the ground, the second pressure-bearing member 112 overcomes the elastic force of the elastic member 122 and ascends along the guide rod 131 in the moving direction of the goods taking mechanism 20, when the lower surface of the second pressure-bearing member 112 is flush with the lower surface of the fork, the second pressure-bearing member stops descending and triggers the second switch member 22, the second switch member 22 converts the pressing force of the second pressure-bearing member 112 into an electric signal to be transmitted to the control device 30, the control device 30 immediately controls the fork to stop ascending, and thus the stacking of the goods shelf is completed.

The protector 50 that this embodiment provided to external force that the pressure-bearing piece 11 received realizes through trigger switch structure 2 that control gets 20 stop motion of goods mechanism as protector 50's trigger signal, for the electronic sensor protector, the embodiment of the utility model provides a protector 50 compact structure has high judgement rate of accuracy, has improved protector 50's reliability and stability.

The fork truck 10 that this embodiment provided, through adopting above-mentioned protector 50, can improve the rate of accuracy that fork truck 10 judged, realized fork truck 10 safe, stable operation.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A guard (50) for use on a pickup mechanism (20), comprising:

the switch structure (2) is arranged on the goods taking mechanism (20) and is configured to control the goods taking mechanism (20) to stop lifting when being triggered;

protective structure (1), including bearing piece (11), bearing piece (11) set up in get on goods mechanism (20) and protrusion in get the upper and lower surface of goods mechanism (20), bearing piece (11) are configured to can be when the pressurized relative to get goods mechanism (20) motion in order to trigger switch structure (2).

2. Guard device (50) according to claim 1, characterized in that the guard structure (1) further comprises a reset assembly (12), the reset assembly (12) comprises a fixing member (121) and an elastic member (122) extending along the moving direction of the pickup mechanism (20), one end of the elastic member (122) is abutted or fixedly connected to the fixing member (121), the other end is abutted or fixedly connected to the bearing member (11), and the elastic member (122) is configured to support the bearing member (11) protruding from the upper and lower surfaces of the pickup mechanism (20).

3. The protection device (50) according to claim 2, wherein the protection structure (1) further comprises a guide assembly (13), the guide assembly (13) comprises a guide post (131) extending along the moving direction of the goods taking mechanism (20), one end of the guide post (131) is fixedly connected to the fixing member (121), and a through hole (113) for the guide post (131) to pass through is formed in the pressure-bearing member (11).

4. The guard device (50) according to claim 3, wherein an end of the guiding stud (131) remote from the fixing member (121) is provided with a limiting member (132), and the limiting member (132) is configured to limit a stroke of the pressure member (11) in a moving direction of the pickup mechanism (20).

5. Guard (50) according to claim 1, characterized in that the bearing member (11) comprises a first bearing member (111), the first bearing member (111) being arranged on a side wall of a pick platform (201) of the pick mechanism (20), the first bearing member (111) having a first position and a second position in the movement direction of the pick mechanism (20), the upper surface of the first bearing member (111) exceeding the upper surface of the pick platform (201) when the first bearing member (111) is in the first position, the first bearing member (111) being capable of triggering the switch mechanism (2) when the first bearing member (111) is in the second position.

6. Guard means (50) according to claim 5, characterized in that said bearing member (11) further comprises a second bearing member (112), said second bearing member (112) being arranged on a side wall of said pick-up platform (201), said second bearing member (112) being arranged opposite to said first bearing member (111) and being located below said first bearing member (111), said second bearing member (112) having a third position and a fourth position in the direction of movement of said pick-up mechanism (20), a lower surface of said second bearing member (112) exceeding a lower surface of said pick-up platform (201) when said second bearing member (112) is in said third position, said second bearing member (112) being capable of triggering said switch mechanism (2) when said second bearing member (112) is in said fourth position.

7. Guard device (50) according to claim 6, characterized in that said switch structure (2) comprises a first switch member (21) and a second switch member (22), said first switch member (21) and said second switch member (22) being located between said first pressure bearing member (111) and said second pressure bearing member (112), said first pressure bearing member (111) being able to trigger said first switch member (21) when said first pressure bearing member (111) is in said second position, said second pressure bearing member (112) being able to trigger said second switch member (22) when said second pressure bearing member (112) is in said fourth position.

8. Guard (50) according to claim 7, characterized in that said first switch member (21) and said second switch member (22) are each micro switches.

9. A forklift (10) comprising a pickup mechanism (20) and a guard (50) as claimed in any one of claims 1 to 8.

10. Fork-lift truck (10) according to claim 9, characterized in that said pick-up mechanism (20) comprises a pick-up platform (201), said pick-up platform (201) being a fork of said fork-lift truck (10), said shielding structure (1) and said switch structure (2) being both provided on said fork.