Pallet fork stroke limit protection switch

Abstract

The utility model discloses a fork stroke limiting protection switch which comprises a forklift body, a guide frame installed on one side of the forklift body, an electric cylinder connected to the guide frame and located on one side of the forklift body, and a lifting block connected to the upper end of the electric cylinder. The lifting frame is inserted into the guide frame in an up-down sliding mode, one side of the lifting frame is fixedly connected with the lifting block, and one side of the lifting frame is fixedly connected with a pallet fork piece used for lifting heavy objects. And the power-off protection unit comprises a wiring block which is arranged at one side of the wiring unit and is used for introducing the circuit led out by the wiring unit, and a switch assembly which is arranged in the wiring block and is used for controlling the on state of the circuit. The butt joint blocks drive the conductive sliding blocks to slide along the conductive rods and gradually compress the jacking springs, so that the two butt joint blocks are separated, at the moment, the electric cylinder is in a power-off state, the pallet fork piece stops rising, and therefore the situation that the gravity center of the forklift is unstable due to the fact that the pallet fork lifts a heavy object to a high position is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift forks, in particular to a fork travel limit protection switch. Background Art

[0002] Forks are a standard feature and an important part of forklifts, used to carry all kinds of cargo. Forks are usually composed of a horizontal section and a vertical section, shaped like the letter "L". The horizontal section is used to pick up and carry cargo, while the vertical section plays a supporting role and connects the fork frame of the forklift. Forks are widely used in many industries, including warehousing, papermaking, packaging, printing, etc., because they are multi-purpose and efficient as a material handling tool.

[0003] However, the forks in the prior art do not have the function of limit protection, resulting in that when a malfunction occurs during the operation of the forklift lifting heavy objects, the forks are in an uncontrolled state of constantly rising. When the forks lift the heavy objects to a higher position, the center of gravity of the forklift gradually rises, causing the center of gravity of the forklift to be unstable, which is prone to rollover accidents and poses certain safety hazards.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art. Utility Model Content

[0005] The purpose of the utility model is to provide a fork travel limit protection switch to solve the problem that the forklift fork in the prior art mentioned in the above background technology does not have the function of limit protection, resulting in the fork being in an uncontrolled state of rising when a malfunction occurs during the operation of the forklift lifting heavy objects, posing certain safety hazards.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A fork travel limit protection switch, comprising a forklift body, a guide frame installed on one side of the forklift body, an electric cylinder connected to the guide frame on one side of the forklift body, a lifting block connected to the upper end of the electric cylinder, a lifting frame slidably inserted in the guide frame and fixedly connected to the lifting block on one side, a fork member for lifting heavy objects fixedly connected to one side of the lifting frame, and further comprising:

[0008] A wiring unit, installed on one side of the guide frame, for leading out a circuit for controlling the lifting of the shelf components;

[0009] The power-off protection unit comprises a wiring block arranged at one side of the wiring unit for introducing a line led out of the wiring unit, and a switch component arranged inside the wiring block for controlling the connection state of the line.

[0010] Furthermore, the wiring unit includes:

[0011] A mounting block fixedly connected to one side of the guide frame;

[0012] A first wire, one end of which is connected to the inside of the mounting block and the other end of which is connected to the inside of the wiring block, for conducting the current in the mounting block into the wiring block;

[0013] A second wire, one end of which is connected to the inside of the mounting block and is located on one side of the first wire, and the other end of which is connected to the inside of the wiring block, and is used to guide the current inside the wiring block into the mounting block;

[0014] A guide groove is provided on one side of the mounting block and is used to guide the upward and downward movement of the wiring block;

[0015] A card slot, which is arranged inside the mounting block and is perpendicular to the guide slot;

[0016] A latch is slidably inserted in the slot and is used to limit the wiring block.

[0017] Furthermore, the junction block includes:

[0018] The receiving grooves are provided with two groups inside the wiring block, and are used to receive the first wire and the second wire respectively;

[0019] A mounting groove, provided inside the wiring block and located at the lower part of the receiving groove;

[0020] A retreat groove, provided inside the wiring block and located at the lower part of the mounting groove, for accommodating and guiding the switch assembly;

[0021] The insertion groove is arranged between the two groups of retreat grooves.

[0022] Furthermore, the switch assembly comprises:

[0023] Conductive rods are provided in two groups and are correspondingly fixedly connected inside the mounting grooves;

[0024] A conductive slider is slidably inserted into the retreat groove, and the upper end of the conductive slider is slidably connected to the conductive rod;

[0025] A docking block, fixedly connected to one end of the conductive slider, a second inclined portion being provided at the lower portion of the docking block;

[0026] A tightening spring is arranged on one side of the tightening spring and located inside the retreat groove, and is used for tightening the conductive sliding block.

[0027] Furthermore, the fork member is located on one side of the junction block and is fixedly connected with a connecting rod;

[0028] One end of the connecting rod is fixedly connected to an insulating block arranged corresponding to the insertion slot;

[0029] The upper end of the insulating block is provided with a first inclined portion having the same inclination as the second inclined portion.

[0030] Furthermore, a reference frame is fixedly connected to one side of the guide frame and directly below the junction block, for reference of the lifting height of the fork member;

[0031] The reference frame is in an N-shape, ensuring that the insulating block can pass through the inner gap of the reference frame.

[0032] Furthermore, the wiring block is located on one side of the mounting block and is fixedly connected to a limiting block;

[0033] The limit block is slidably inserted in the guide groove;

[0034] A slot for penetrating the latch pin is provided inside the limiting block.

[0035] Compared with the prior art, the beneficial effects of the utility model are:

[0036] 1. When the travel of the electric cylinder of the utility model fails and causes the fork member to be in an uncontrolled and continuously rising state, the fork member will drive the insulating block to move upward through the connecting rod and enter the insertion slot after passing through the reference frame. In this process, the insulating block pushes the second inclined portion upward through the first inclined portion, and the second inclined portion drives the docking block to move along the retreat groove under the action of the tangential force between the second inclined portion and the first inclined portion. The docking block drives the conductive slider to slide along the conductive rod and gradually compresses the tensioning spring, so that the two groups of docking blocks are separated. At this time, the electric cylinder is in a power-off state, and the fork member stops rising, thereby preventing the fork from lifting the heavy object to a higher position, causing the forklift to have an unstable center of gravity, and then causing a rollover accident.

[0037] 2. After the fault of the electric cylinder is solved, the utility model pulls the pin out of the slot, and then pulls the wiring block upward, the wiring block drives the limit block to move upward along the guide groove, so that the insulating block is separated from the docking block, so that the circuit is connected again. At this time, the electric cylinder is controlled to retract downward, so that the insulating block is driven to the safe travel area below the reference frame, and then the wiring block is reset, and the pin is inserted into the slot to complete the limiting of the wiring block, so that the switch assembly can be connected in time after the fault is eliminated, and the working efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0039] Figure 2 This is a diagram showing the matching relationship between the guide frame and the lifting frame of the utility model;

[0040] Figure 3 This is a diagram showing the coordination relationship between the wiring unit and the power-off protection unit of the utility model;

[0041] Figure 4 This is a schematic diagram of the internal structure of the wiring block of the utility model;

[0042] Figure 5 This is a state diagram of the power-off process of the utility model;

[0043] Figure 6 This is a schematic diagram of the internal structure of the mounting block of the utility model.

[0044] 100, forklift body; 101, guide frame; 1011, reference frame; 102, electric cylinder; 103, lifting block; 1031, lifting frame; 104, fork member; 1041, connecting rod; 1042, insulating block; 1043, first inclined portion; 105, heavy object; 1, wiring unit; 11, mounting block; 12, first wire; 13, second wire; 14, guide groove; 15, card slot; 16, latch; 2, power-off protection unit; 21, wiring block; 211, accommodating groove; 212, mounting groove; 213, retreat groove; 22, insertion groove; 23, switch assembly; 230, conductive rod; 231, conductive slider; 232, tightening spring; 233, docking block; 234, second inclined portion; 24, limit block; 241, slot. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] See also Figure 1-6 , the utility model provides a technical solution:

[0047] A fork travel limit protection switch, comprising a forklift body 100, a guide frame 101 installed on one side of the forklift body 100, an electric cylinder 102 connected to the guide frame 101 and located on one side of the forklift body 100, a lifting block 103 connected to the upper end of the electric cylinder 102, a lifting frame 1031 that is inserted into the guide frame 101 and fixedly connected to the lifting block 103 on one side, a fork member 104 for lifting a heavy object 105 is fixedly connected to one side of the lifting frame 1031, and further comprising:

[0048] A wiring unit 1 is installed on one side of the guide frame 101 and is used to lead out the circuit for controlling the lifting of the shelf components;

[0049] The power-off protection unit 2 comprises a wiring block 21 disposed at one side of the wiring unit 1 for introducing the line led out of the wiring unit 1, and a switch component 23 disposed inside the wiring block 21 for controlling the connection state of the line.

[0050] As an improvement, Figure 2-3 , Figure 6 As shown, the wiring unit 1 includes:

[0051] A mounting block 11, fixedly connected to one side of the guide frame 101;

[0052] A first wire 12, one end of which is connected to the inside of the mounting block 11 and the other end of which is connected to the inside of the wiring block 21, and is used to guide the current in the mounting block 11 into the wiring block 21;

[0053] A second wire 13, one end of which is connected to the inside of the mounting block 11 and is located on one side of the first wire 12, and the other end of which is connected to the inside of the wiring block 21, and is used to guide the current inside the wiring block 21 into the mounting block 11;

[0054] A guide groove 14 is provided on one side of the mounting block 11 and is used to guide the wiring block 21 to move up and down;

[0055] A card slot 15 is provided inside the mounting block 11 and is perpendicular to the guide slot 14;

[0056] The latch 16 is slidably inserted into the slot 15 to limit the wiring block 21 .

[0057] Further, such as Figure 5 As shown, the wiring block 21 includes:

[0058] The receiving grooves 211 are provided with two groups inside the wiring block 21, and are used to receive the first wire 12 and the second wire 13 respectively;

[0059] The mounting groove 212 is provided inside the wiring block 21 and is located at the lower part of the receiving groove 211;

[0060] The retreat groove 213 is provided inside the wiring block 21 and located at the lower part of the installation groove 212, and is used to accommodate and guide the switch assembly 23;

[0061] The insertion slot 22 is disposed between the two sets of retreat slots 213 .

[0062] Furthermore, if Figure 5 As shown, the switch assembly 23 includes:

[0063] Conductive rods 230 are provided in two groups and are correspondingly fixedly connected inside the mounting grooves 212;

[0064] A conductive slider 231 is slidably inserted into the recess 213 , and an upper end of the conductive slider 231 is slidably connected to the conductive rod 230 ;

[0065] A docking block 233, fixedly connected to one end of the conductive slider 231, and a second inclined portion 234 is provided at the lower portion of the docking block 233;

[0066] The tightening spring 232 is provided at one side of the tightening spring 232 and is located inside the retreat groove 213 , and is used for tightening the conductive slider 231 .

[0067] Among them, Figure 3 As shown, the fork member 104 is located at one side of the wiring block 21 and is fixedly connected to a connecting rod 1041;

[0068] One end of the connecting rod 1041 is fixedly connected to an insulating block 1042 corresponding to the insertion slot 22;

[0069] The upper end of the insulating block 1042 is provided with a first inclined portion 1043 having the same inclination as the second inclined portion 234 .

[0070] In addition, a reference frame 1011 is fixedly connected to one side of the guide frame 101 and directly below the wiring block 21, and is used to provide a reference for the lifting height of the fork member 104;

[0071] The reference frame 1011 is in an N-shape, ensuring that the insulating block 1042 can pass through the inner gap of the reference frame 1011 .

[0072] As an improvement, Figure 3 , Figure 6 As shown, the wiring block 21 is located on one side of the mounting block 11 and is fixedly connected to a limiting block 24;

[0073] The limit block 24 is slidably inserted into the guide groove 14;

[0074] The limiting block 24 has a slot 241 therein for the latch pin 16 to penetrate.

[0075] It should be added that a control system for controlling the lifting of the fork member 104 is provided inside the mounting block 11 of the utility model. The current for switching the power supply state of the control system is drawn from the control system and passes through the first wire 12 → switch component 23 → second wire 13 → control system in sequence.

[0076] It should be noted that: Figure 1-2As shown, in the specific implementation process of the utility model, when the fork member 104 lifts the heavy object 105, after the forklift body 100 drives the fork member 104 to scoop up the heavy object 105, the control system located in the mounting block 11 controls the electric cylinder 102 to lift upward, and the electric cylinder 102 drives the lifting frame 1031 to move upward along the guide frame 101 through the lifting block 103, and the lifting frame 1031 drives the fork member 104 to move upward, so that the heavy object 105 scooped by the fork member 104 is lifted, and then the forklift body 100 transports the lifted heavy object 105;

[0077] like Figure 3-4 As shown, the utility model installs a reference frame 1011 on one side of the guide frame 101. When the fork member 104 lifts the weight 105 each time, the fork member 104 drives the insulating block 1042 to move upwards synchronously through the connecting rod 1041. The height of each upward movement of the insulating block 1042 is controlled to be lower than the height of the reference frame 1011 by the connecting rod 1041, so as to ensure that the travel range of the electric cylinder 102 is within the normal working range.

[0078] like Figure 3-5 As shown, when a stroke failure of the electric cylinder 102 causes the fork member 104 to be in an uncontrolled state of rising, the fork member 104 will drive the insulating block 1042 to move upward through the connecting rod 1041 and enter the insertion slot 22 after passing the reference frame 1011. In this process, the insulating block 1042 pushes the second inclined portion 234 upward through the first inclined portion 1043. The second inclined portion 234 drives the docking block 233 to move along the retreat slot 213 under the action of the tangential force between the second inclined portion 234 and the first inclined portion 1043. The docking block 233 drives the conductive slider 231 to slide along the conductive rod 230 and gradually compresses the tensioning spring 232, so that the two groups of docking blocks 233 are separated. At this time, the electric cylinder 102 is in a power-off state, and the fork member 104 stops rising, thereby preventing the fork from lifting the heavy object 105 to a higher position, causing the forklift to have an unstable center of gravity, and then a rollover accident.

[0079] like Figure 3 , Figure 6 As shown, in addition, after the fault of the electric cylinder 102 is resolved, the utility model pulls out the pin 16 from the slot 241, and then pulls the wiring block 21 upward, and the wiring block 21 drives the limit block 24 to move upward along the guide groove 14, so that the insulating block 1042 is disengaged from the docking block 233, so that the circuit is connected again. At this time, the electric cylinder 102 is controlled to retract downward, so that the insulating block 1042 is driven to the safe travel area below the reference frame 1011, and then the wiring block 21 is reset, and the pin 16 is inserted into the slot 241 to complete the limiting of the wiring block 21, so that the switch assembly 23 can be connected in time after the fault is eliminated, and the working efficiency is high.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fork travel limit protection switch, comprising a forklift body (100), a guide frame (101) mounted on one side of the forklift body (100), an electric cylinder (102) connected to the guide frame (101) and located on one side of the forklift body (100), a lifting block (103) connected to the upper end of the electric cylinder (102), a lifting frame (1031) inserted into the guide frame (101) and fixedly connected to the lifting block (103) on one side, a fork member (104) for lifting a heavy object (105) being fixedly connected to one side of the lifting frame (1031), characterized in that: Also includes: A wiring unit (1), installed on one side of the guide frame (101), used to lead out a circuit for controlling the lifting of the shelf components; A power-off protection unit (2) comprises a wiring block (21) arranged at one side of the wiring unit (1) for introducing a line led out of the wiring unit (1), and a switch component (23) arranged inside the wiring block (21) for controlling the connection state of the line.

2. A fork travel limit protection switch according to claim 1, characterized in that: The wiring unit (1) comprises: A mounting block (11) fixedly connected to one side of the guide frame (101); A first conductive wire (12), one end of which is connected to the interior of the mounting block (11) and the other end of which is connected to the interior of the wiring block (21), and is used to guide the current in the mounting block (11) into the wiring block (21); A second wire (13), one end of which is connected to the interior of the mounting block (11) and is located on one side of the first wire (12), and the other end of which is connected to the interior of the wiring block (21), and is used to guide the current inside the wiring block (21) into the mounting block (11); A guide groove (14) is provided on one side of the mounting block (11) and is used to guide the upward and downward movement of the wiring block (21); A card slot (15) is arranged through the interior of the mounting block (11) and is perpendicular to the guide slot (14); The latch (16) is slidably inserted into the slot (15) and is used to limit the position of the wiring block (21).

3. A fork travel limit protection switch according to claim 2, characterized in that: The junction block (21) comprises: Two groups of accommodating grooves (211) are provided inside the wiring block (21) and are used to accommodate the first wire (12) and the second wire (13) respectively; A mounting groove (212) is provided inside the wiring block (21) and is located at the lower part of the containing groove (211); A retreat groove (213), arranged inside the wiring block (21) and located at the lower part of the installation groove (212), and used for accommodating and guiding the switch assembly (23); The insertion groove (22) is arranged between the two groups of retreat grooves (213).

4. A fork travel limit protection switch according to claim 3, characterized in that: The switch assembly (23) comprises: Conductive rods (230) are provided in two groups and are correspondingly fixedly connected inside the mounting grooves (212); A conductive slider (231) is slidably inserted into the retreat groove (213), and the upper end of the conductive slider (231) is slidably connected to the conductive rod (230); A docking block (233) is fixedly connected to one end of the conductive sliding block (231), and a second inclined portion (234) is provided at the lower portion of the docking block (233); A tightening spring (232) is arranged on one side of the tightening spring (232) and is located inside the retreat groove (213), and is used to tighten the conductive sliding block (231).

5. A fork travel limit protection switch according to claim 4, characterized in that: The fork member (104) is located on one side of the wiring block (21) and is fixedly connected to a connecting rod (1041); One end of the connecting rod (1041) is fixedly connected to an insulating block (1042) arranged corresponding to the insertion slot (22); The upper end of the insulating block (1042) is provided with a first inclined portion (1043) having the same inclination as the second inclined portion (234).

6. A fork travel limit protection switch according to claim 5, characterized in that: A reference frame (1011) is fixedly connected to one side of the guide frame (101) and is located directly below the wiring block (21), and is used to provide a reference for the lifting height of the fork member (104); The reference frame (1011) is in an N-shape, ensuring that the insulating block (1042) can pass through the inner gap of the reference frame (1011).

7. A fork travel limit protection switch according to claim 3, characterized in that: The wiring block (21) is located on one side of the mounting block (11) and is fixedly connected to a limiting block (24); The limit block (24) is slidably inserted into the guide groove (14); The limiting block (24) is provided inside with a slot (241) for penetrating the latch pin (16).

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