Limiting protection device for lift truck

Abstract

A lift truck limiting protection device comprises a transverse contact rod and two longitudinal spring sleeves. The transverse contact rod is located above an operation frame of the lift truck and is parallel to the length direction of the operation frame, the two longitudinal spring sleeves are fixed to the two vertexes, in the length direction, of the operation frame respectively, and the two longitudinal spring sleeves are each internally provided with a longitudinal connecting rod extending vertically and upwards in a penetrating mode. The two longitudinal connecting rods are connected through a transverse contact rod; the side walls of the two longitudinal spring sleeves are each provided with a limiting switch, a contact of each limiting switch is arranged upwards, and the two limiting switches are connected with a main control power source of the lift truck through wires. The two longitudinal connecting rods are provided with limiting trigger pieces used for triggering the corresponding limiting switches respectively. The lifting truck operation frame can be better suitable for being used in special terrains with uneven construction faces, the overall safety performance of the lifting work of the lifting truck operation frame is improved, and the safety of the construction environment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of lift limit protection technology equipment, in particular to a lift limit protection device. Background Art

[0002] The existing lift guardrails are generally equipped with touch-type limit switches. The lift can contact the construction surface in advance through the touch-type limit switch and cut off the main control power of the lift in time, so that the lift guardrail stops at the appropriate position in time, and the lifting height is limited to prevent the lift guardrail from continuing to move or rise and colliding with the construction surface. However, the existing touch-type limit switches installed on the guardrails of the lift are usually suitable for most flat construction surfaces. When the construction surface is a special terrain with uneven terrain, the contact area of ​​the existing touch-type limit switches is small. If the touch-type limit switch is offset from the raised part of the construction surface, the main control power of the lift cannot be cut off in time, which may cause unnecessary safety accidents and reduce the safety performance of the lift. Utility Model Content

[0003] The utility model aims to provide a lifting vehicle limit protection device which can increase the contact area with a special terrain construction surface.

[0004] In order to solve the above technical problems, the specific solution adopted by the utility model is a lifting vehicle limit protection device, including a transverse contact rod and two longitudinal spring sleeves;

[0005] The transverse contact rod is located above the operating frame of the lifting vehicle and is parallel to the length direction of the operating frame. Two longitudinal spring sleeves are respectively fixed on two vertices of the operating frame along the length direction. A longitudinal connecting rod extending vertically upward is respectively inserted into the two longitudinal spring sleeves. The two longitudinal connecting rods are connected by the transverse contact rod.

[0006] A limit switch is installed on the side walls of the two longitudinal spring sleeves respectively, and the contacts of each limit switch are set upward. The two limit switches are connected to the main control power supply of the lifting vehicle through wires; limit trigger plates for triggering the corresponding limit switches are respectively arranged on the two longitudinal connecting rods.

[0007] As an optimization solution for the above-mentioned lifting vehicle limit protection device: the longitudinal spring sleeve includes a single-port sleeve, in which a spring is installed, one end of the spring is fixedly connected to the bottom of the single-port sleeve, and the other end is connected to the longitudinal connecting rod inserted into the single-port sleeve.

[0008] As another optimization scheme of the above-mentioned lifting vehicle limit protection device: two limit switches are respectively arranged on the outer side walls of the opposite sides of the longitudinal spring sleeve, and two limit trigger sheets are respectively arranged on the outer side walls of the opposite sides of the longitudinal connecting rod.

[0009] As another optimization scheme of the above-mentioned lifting vehicle limit protection device: the distance between the transverse contact rod and the operating frame is 10 to 20 cm.

[0010] As another optimization scheme of the above-mentioned lifting vehicle limit protection device: two limit switches are respectively fixed to the corresponding side longitudinal spring sleeves through U-shaped bolts.

[0011] As another optimization scheme of the above-mentioned lifting vehicle limit protection device: both ends of the transverse contact rod are connected to the corresponding side longitudinal connecting rods through arc-shaped bent pipes.

[0012] As another optimization scheme of the above-mentioned lifting vehicle limit protection device: the transverse contact rod, the two longitudinal connecting rods and the arc-shaped bent pipe are all circular tubes with hollow interiors.

[0013] As another optimization solution of the above-mentioned lifting vehicle limit protection device: the transverse contact rod and the arc-shaped bent pipe and the two longitudinal connecting rods are integrally formed.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The transverse contact rod in the utility model is arranged above the operating frame of the lifting vehicle and is parallel to the length direction of the operating frame. Two longitudinal spring sleeves are fixed on the operating frame. A longitudinal connecting rod extending vertically upward and connected to the end of the corresponding transverse contact rod is inserted in each of the two longitudinal spring sleeves. A limit switch is arranged on the upper side wall of each of the two longitudinal spring sleeves. Correspondingly, a limit trigger piece is installed on each of the two longitudinal connecting rods just above the corresponding limit switch. The limit switch is connected to the main control power supply of the lifting vehicle through a wire. When the operating frame rises to contact with the special terrain under the drive of the lifting vehicle driving mechanism, the transverse contact rod can achieve line contact with the special terrain in advance. After that, the transverse contact rod will generate downward pressure and drive the longitudinal connecting rod to move downward. The limit trigger piece on the downwardly moving longitudinal connecting rod will trigger the limit switch on the corresponding side. Then, the limit switch controls to disconnect the power supply of the main control power supply, and the lifting platform stops rising, and the entire work project is completed. When the main control power is cut off, the platform of the lift is controlled to descend to leave a working space. Then, the longitudinal connecting rod drives the transverse contact rod to rise under the reaction force of the spring, and then the limit trigger piece is disconnected from the limit switch, that is, the whole set of limit devices returns to the original working state. Compared with the point contact between the existing point-touch limit switch and the construction surface, the line contact between the transverse contact rod and the special terrain construction surface in the present application has a wider contact area with the special terrain construction surface, which can be better applied to special terrains with uneven construction surfaces. Moreover, on the basis of controlling costs, the present application can also avoid the problem of safety accidents caused by the operation frame rising under the drive of the lift driving mechanism and colliding with the special terrain, and improve the overall safety performance of the lifting operation frame, ensuring the safety of the construction environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model installed on the operating frame of a lifting vehicle;

[0017] Figure 2 Schematic diagram of the internal structure of the longitudinal spring sleeve.

[0018] Figure numerals: 1. lateral contact rod, 2. arc-shaped bent pipe, 3. longitudinal connecting rod, 4. limit trigger plate, 5. longitudinal spring sleeve, 501. single-port sleeve, 502. spring, 6. limit switch, 7. operating frame, 8. lifting vehicle. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further elaborated in detail below in conjunction with specific embodiments. Parts not described in detail in the following embodiments of the utility model, such as cutting off the power supply of the main control power supply of the lifting vehicle after the limit switch contacts the limit contact piece, and the longitudinal spring sleeve being fixed to the operating frame by U-shaped bolts, etc., should be immediately known to those skilled in the art or should be known to the prior art.

[0020] like Figure 1 As shown, a lifting vehicle position limiting protection device includes two longitudinal spring sleeves 5, and the two longitudinal spring sleeves 5 are respectively fixed to two vertices of the operating frame 7 along the length direction. A cross bar (not shown in the figure) is fixed between two vertical bars distributed along the height direction of the operating frame 7 of the lifting vehicle 8, and the cross bar is arranged along the length direction of the operating frame 7. The two longitudinal spring sleeves 5 are respectively fixed to the cross bar by U-shaped bolts at positions close to the corresponding side vertical bars.

[0021] like Figure 2 As shown, the longitudinal spring sleeve 5 includes a single-port sleeve 501 and a spring 502 arranged in the single-port sleeve 501. The lower end of the single-port sleeve 501 is a closed end, and the upper end of the single-port sleeve 501 is an open end. The upper open end of the single-port sleeve 501 is arranged upward, and a longitudinal connecting rod 3 is respectively inserted in the two single-port sleeves 501. The two longitudinal connecting rods 3 are both hollow round tubes, and the material of the two longitudinal connecting rods 3 is stainless steel.

[0022] The upper ends of the two longitudinal connecting rods 3 extend upward in the vertical direction, and the lower ends of the two longitudinal connecting rods 3 are closed ends and are slidably arranged in the single-port sleeve 501 on the corresponding side. The lower end of the spring 502 arranged in the single-port sleeve 501 is fixed to the closed end at the bottom of the single-port sleeve 501, and the upper end of the spring 502 is fixedly connected to the lower end of the longitudinal connecting rod 3 on the corresponding side that penetrates into the single-port sleeve 501.

[0023] like Figure 1 As shown, the upper ends of the two longitudinal connecting rods 3 away from the single-port sleeve 501 are connected by a transverse contact rod 1, which is a hollow round tube with open ends at both ends, and the material of the transverse contact rod 1 is stainless steel consistent with the longitudinal connecting rod 3. The transverse contact rod 1 is located above the operating frame 7 of the lifting vehicle 8 and is parallel to the length direction of the operating frame 7, and the transverse contact rod 1 is located 15 cm above the operating frame 7 of the lifting vehicle 8.

[0024] The two ends of the transverse contact rod 1 are connected to the corresponding longitudinal connecting rod 3 through an arc-shaped curved pipe 2, one end of the arc-shaped curved pipe 2 is connected to the transverse contact rod 1, and the other end is connected to the corresponding longitudinal connecting rod 3. The two arc-shaped curved pipes 2 are both hollow circular tubes, and the transverse contact rod 1, the two arc-shaped curved pipes 2 and the two longitudinal connecting rods 3 are integrally formed.

[0025] A limit switch 6 is respectively installed on the outer walls of the opposite sides of the two single-port sleeves 501, a limit switch 6 is fixed on the right wall of the left single-port sleeve 501, and a limit switch 6 is fixed on the left wall of the right single-port sleeve 501. The bottoms of the two limit switches 6 are flush with the bottoms of the corresponding single-port sleeves 501, and the contact heights of the tops of the two limit switches 6 exceed the upper end of the corresponding single-port sleeve 501 by 2 cm.

[0026] A base is provided on one side of the two limit switches 6 facing the corresponding single-port sleeve 501, and a plurality of bolt holes are provided on the base. The limit switches 6 are fixed to the corresponding single-port sleeve 501 by U-shaped bolts, respectively. The U-shaped bolts are encircled around the single-port sleeve 501, and both ends of the U-shaped bolts with external threads pass through the bolt holes and are matched with nuts, so that the limit switches 6 are fixed to the single-port sleeve 501.

[0027] The two limit switches 6 are connected in series with the main control power supply of the elevator through wires. A limit trigger piece 4 is provided on the outer side wall of the two longitudinal connecting rods 3 at a position 4 cm away from the open end of the corresponding side single-port sleeve 501, and the two limit trigger pieces 4 are located directly above the corresponding limit switches 6.

[0028] When the limit trigger piece 4 contacts the limit switch 6, the limit switch 6 cuts off the main control power supply to prevent the lifting vehicle 8 from continuing to rise, thereby avoiding the situation where the operating frame 7 of the lifting vehicle 8 collides with the protrusions of the special terrain of the construction surface and causes safety accidents, thereby improving the safety performance of the lifting vehicle 8 during operation.

[0029] The specific implementation method is as follows: first, the device is installed on the corresponding position of the operating frame 7 of the lifting vehicle 8. When the operating frame 7 rises to contact with the special terrain under the drive of the driving mechanism of the lifting vehicle 8, the lateral contact rod 1 will generate downward pressure after contacting the convex point on the special terrain and drive the longitudinal connecting rod 3 to move downward. The limit trigger piece 4 on the downwardly moved longitudinal connecting rod 3 will trigger the limit switch 6 on the corresponding side. At the same time, the limit switch 6 cuts off the main control power supply, the lifting platform stops rising, and the entire work project is completed.

[0030] When the main control power is cut off, the platform of the lifting vehicle 8 is controlled to descend to leave a working space, and the longitudinal connecting rod 3 drives the transverse contact rod 1 to rise under the reaction force of the spring 502, and then the limit trigger piece 4 is disconnected from the limit switch 6, that is, the entire set of limit devices returns to the original working state.

Claims

1. A lifting vehicle limit protection device, characterized in that: It comprises a transverse contact rod (1) and two longitudinal spring sleeves (5); The transverse contact rod (1) is located above the operating frame (7) of the lifting vehicle (8) and is parallel to the length direction of the operating frame (7). Two longitudinal spring sleeves (5) are respectively fixed on two vertices of the operating frame (7) along the length direction. A longitudinal connecting rod (3) extending vertically upward is respectively inserted into the two longitudinal spring sleeves (5). The two longitudinal connecting rods (3) are connected via the transverse contact rod (1). A limit switch (6) is respectively installed on the side wall of the two longitudinal spring sleeves (5), and the contact of each limit switch (6) is arranged to face upward. The two limit switches (6) are connected to the main control power supply of the lifting vehicle through a wire; and a limit triggering piece (4) for triggering the corresponding limit switch (6) is respectively arranged on the two longitudinal connecting rods (3).

2. A lifting vehicle limit protection device according to claim 1, characterized in that: The longitudinal spring sleeve (5) comprises a single-port sleeve (501), a spring (502) is installed in the single-port sleeve (501), one end of the spring (502) is fixedly connected to the bottom of the single-port sleeve (501), and the other end is connected to a longitudinal connecting rod (3) inserted into the single-port sleeve (501).

3. A lifting vehicle limit protection device according to claim 1, characterized in that: The two limit switches (6) are respectively arranged on the outer side walls of the longitudinal spring sleeve (5) opposite to each other, and the two limit trigger plates (4) are respectively arranged on the outer side walls of the longitudinal connecting rod (3) opposite to each other.

4. The lifting vehicle position limiting protection device according to claim 1, characterized in that: The distance between the transverse contact rod (1) and the operating frame (7) is 10 to 20 cm.

5. The lifting vehicle limit protection device according to claim 1, characterized in that: The two limit switches (6) are respectively fixed to the corresponding side longitudinal spring sleeves (5) through U-shaped bolts.

6. The lifting vehicle position limiting protection device according to claim 1, characterized in that: Both ends of the transverse contact rod (1) and the corresponding longitudinal connecting rod (3) are connected via arc-shaped curved pipes (2).

7. A lifting vehicle position limiting protection device according to claim 6, characterized in that: The transverse contact rod (1), the two longitudinal connecting rods (3) and the arc-shaped curved pipe (2) are all circular pipes with hollow interiors.

8. The lifting vehicle position limiting protection device according to claim 6, characterized in that: The transverse contact rod (1), the arc-shaped curved pipe (2) and the two longitudinal connecting rods (3) are integrally formed.

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