Limiting protection device for movable workbench

Abstract

The utility model discloses a limiting protection device for a movable working table in the field of press machines, which comprises a working platform, a sliding rail is arranged on the working platform, the top of the sliding rail is flush with the top of the working platform, the terminal end of the sliding rail is positioned on the working platform, the starting end of the sliding rail is positioned outside the working platform, and the movable working table is arranged on the sliding rail. The movable workbench is provided with a front limiting mechanism, a rear speed reduction limiting mechanism and a movable limiting mechanism in a matched mode. The movable workbench moves from the starting point end to the terminal point end of the sliding rail, the rear speed reduction limiting mechanism enables the movable workbench to be decelerated firstly when the movable workbench is about to reach the terminal point end of the sliding rail, then the movable workbench stops moving at the terminal point end, finally the movable limiting mechanism fixes the movable workbench and the working platform, and the phenomenon that the movable workbench moves out is prevented.

Description

Technical Field

[0001] The utility model relates to a position limiting protection device in the field of presses. Background Art

[0002] At present, the mobile worktable in the press stops the motor of the mobile worktable by touching the mechanical travel switch to trigger the PLC signal. During the long-term use of the machine tool, the mobile worktable often hits the travel switch, which may cause the travel switch to become loose or damaged. When the travel switch is loose or damaged, the stop position of the mobile worktable may shift or directly open out of the limited position, causing a major accident. Utility Model Content

[0003] The utility model aims to provide a limit protection device for a mobile workbench, which ensures that the mobile workbench moves within the range of a track and avoids the mobile workbench from jumping out due to failure of a detection switch.

[0004] To achieve the above-mentioned purpose, the utility model provides a mobile workbench limit protection device, including a work platform, a slide rail is arranged on the work platform, the top of the slide rail is flush with the top of the work platform, the end end of the slide rail is on the work platform, and the starting end of the slide rail is outside the work platform. A mobile workbench is arranged on the slide rail, and the mobile workbench is equipped with a front limit mechanism, a rear deceleration limit mechanism and a movable limit mechanism.

[0005] Compared with the prior art, the beneficial effect of the utility model lies in that the mobile workbench moves from the starting end to the end end of the slide rail, and through the rear deceleration limit mechanism, the mobile workbench is first decelerated when it is about to reach the end end of the slide rail, and then stops moving at the end end, and finally the mobile workbench is fixed to the work platform through the movable limit mechanism to prevent the mobile workbench from jumping out.

[0006] As a further improvement of the utility model, the front limit mechanism includes a front limit block, which is arranged at the starting end of the slide rail, and a front stop proximity switch is arranged on the top of the front limit block; in this way, when the mobile workbench returns to the starting end of the slide rail, the front stop proximity switch senses the mobile workbench, and it will send a signal to the PLC, so that the PLC controls the motor of the mobile workbench to stop rotating. If a fault occurs during this process, the mobile workbench continues to move and collides with the front limit block, thereby stopping movement and preventing the mobile workbench from rushing out.

[0007] As a further improvement of the present invention, a surface of the front limit block facing the movable workbench is processed into a slope; in this way, when a fault occurs and the movable workbench contacts the front limit block, its wheels can move upward along the slope, thereby reducing the speed of the movable workbench through the slope and eventually stopping the movable workbench, which can prevent the movable workbench from jumping out of the slide rail and prevent a hard collision between the movable workbench and the front limit block from causing damage.

[0008] As a further improvement of the utility model, the rear deceleration limit mechanism includes a rear mounting block, which is arranged on the working platform and on one side of the end end of the slide rail, a deceleration proximity switch is arranged at the front end of the rear mounting block, and a rear stop proximity switch is arranged at the rear end of the rear mounting block.

[0009] In this way, the mobile workbench moves toward the end of the slide rail, and after being sensed by the deceleration proximity switch, the signal is transmitted to the PLC, and the PLC controls the motor of the mobile workbench to reduce the speed, so that the moving speed of the mobile workbench is reduced. Later, when the mobile workbench is sensed by the rear stop proximity switch, a signal is sent to the PLC, and the PLC controls the motor of the mobile workbench to stop rotating, so that it stops at the end of the slide rail.

[0010] As a further improvement of the utility model, the spacing between the deceleration proximity switch and the rear stop proximity switch is 10 cm to 20 cm; this can ensure that the moving workbench has enough distance to decelerate.

[0011] As a further improvement of the utility model, the movable limit mechanism includes an upper limit protrusion and a lower limit groove. The upper limit protrusion is arranged at the bottom of the movable workbench, and the lower limit groove is arranged on the working platform. The upper limit protrusion and the lower limit groove match each other; in this way, when the movable workbench is stopped after being sensed by the rear stop proximity switch, the lower part of the upper limit protrusion just contacts with the upper part of the lower limit groove, so that the movable workbench can obtain a double limiting effect to prevent it from jumping out of the slide rail.

[0012] As a further improvement of the utility model, four lifting cylinders are arranged in the working platform, and the telescopic ends of the lifting cylinders are respectively connected with a section of movable track, which is a part of the slide rail; in this way, when the mobile workbench stops, the PLC controls the telescopic ends of the lifting cylinders to retract downward, so that the four sections of movable track detach from the slide rail and move downward, and the mobile workbench also moves downward, and the upper limit protrusion is completely inserted into the lower limit groove, thereby completely locking and fixing the mobile workbench to prevent it from detaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a state diagram of the mobile workbench of the utility model at the starting end.

[0014] Figure 2This is a state diagram of the mobile workbench of the utility model being at the terminal end.

[0015] Figure 3 This is a state diagram of the mobile workbench of the utility model after it has descended.

[0016] Figure 4 It is a top view of the working platform of the utility model.

[0017] Among them: 1 front stop proximity switch, 2 moving workbench, 3 movable track, 4 lower limit groove, 5 deceleration proximity switch, 6 front limit block, 7 upper limit bump, 8 working platform, 9 lifting cylinder, 10 rear stop proximity switch, 11 slide rail, 12 rear mounting block. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings:

[0019] like Figure 1-4 A mobile workbench limit protection device shown includes a work platform 8, a slide rail 11 is arranged on the work platform 8, the top of the slide rail 11 is flush with the top of the work platform 8, the end end of the slide rail 11 is on the work platform 8, and the starting end of the slide rail 11 is outside the work platform 8. A mobile workbench 2 is arranged on the slide rail 11, and the mobile workbench 2 is equipped with a front limit mechanism, a rear deceleration limit mechanism and a movable limit mechanism.

[0020] The front limit mechanism includes a front limit block 6, which is arranged at the starting end of the slide rail 11, and a front stop proximity switch 1 is arranged on the top of the front limit block 6; a side of the front limit block 6 facing the mobile workbench 2 is processed into a slope; the rear deceleration limit mechanism includes a rear mounting block 12, which is arranged on the working platform 8 and is on one side of the terminal end of the slide rail 11, a deceleration proximity switch 5 is arranged at the front end of the rear mounting block 12, and a rear stop proximity switch 10 is arranged at the rear end of the rear mounting block 12.

[0021] The spacing between the deceleration proximity switch 5 and the rear stop proximity switch 10 is 10cm to 20cm; the movable limit mechanism includes an upper limit protrusion 7 and a lower limit groove 4, the upper limit protrusion 7 is arranged at the bottom of the movable workbench 2, and the lower limit groove 4 is arranged on the working platform 8, and the upper limit protrusion 7 and the lower limit groove 4 are matched with each other; four lifting cylinders 9 are arranged in the working platform 8, and the telescopic ends of the lifting cylinders 9 are respectively connected to a section of the movable track 3, and the movable track 3 is a part of the slide rail 11.

[0022] In the utility model, there are two slide rails 11, and both slide rails 11 have a portion located on the working platform 8 and the other portion extending out of the working platform. The top of the slide rail 11 is flush with the top of the working platform 8. Each slide rail 11 on the part of the working platform has two sections of movable rails 3. The movable rails 3 are connected to the lifting cylinder 9 arranged in the working platform 8, and can be moved vertically up and down through the lifting cylinder 9.

[0023] The lower limit groove 4 is set on the top of the workbench and between the two slide rails 11, matching the upper limit protrusion 7 at the bottom of the movable workbench 2. The side of the lower limit groove 4 close to the terminal end of the slide rail 11 is higher than the top of the work platform 8 and slightly higher than the bottom of the upper limit protrusion 7.

[0024] During operation, the PLC controls the motor of the mobile working platform 8 to work, driving the mobile working platform 2 to move toward the terminal end of the slide rail 11. When the deceleration proximity switch 5 senses the mobile working platform 2, it will send a deceleration signal to the PLC, thereby causing the PLC to control the motor speed to decrease, so that the mobile working platform 8 will decelerate and move in advance. When the rear stop proximity switch 10 senses the mobile working platform 2, it will send a stop signal to the PLC, thereby causing the PLC to control the motor to stop rotating, so that the mobile working platform 8 will stop moving. At this time, the lower part of the upper limit protrusion 7 also conflicts with the side of the lower limit groove 4 that is higher than the working platform 8. In this way, when the rear stop proximity switch 10 is working normally, the mobile working The workbench 2 will stop immediately, and once the rear stop proximity switch 10 fails, the upper limit protrusion will collide with the lower limit groove 4, which will also stop the mobile workbench 2 from moving. Moreover, due to the deceleration, the collision force between the two is small, and the upper limit protrusion and the lower limit groove 4 will not be damaged; then the PLC controls the telescopic end of the lifting cylinder 9 to retract downward, thereby moving the movable track 3 downward. At this time, the four wheels of the mobile workbench 2 are respectively on the four sections of the movable track 3. When the movable track 3 moves downward, the mobile work platform 8 will also move downward as a whole, so that the upper limit protrusion 7 is completely inserted into the lower limit groove 4, and then the mobile work platform 8 is locked to prevent it from moving back and forth.

[0025] When the mobile workbench 2 needs to return to the starting end of the slide rail 11, the PLC controls the motor to rotate, so that the mobile workbench 2 moves toward the starting end of the slide rail 11. When the front stop proximity switch 1 senses the mobile workbench 2, it sends a stop signal to the PLC, so that the PLC controls the motor to stop rotating, and the mobile workbench 2 stops moving; if the front stop proximity switch 1 fails, the mobile workbench 2 continues to move to the slope of the front limit block 6, and the mobile workbench 2 moves upward along the slope. Due to the effect of gravity, the mobile workbench 2 finally stops and slides down again, avoiding damage caused by collision between the mobile workbench 2 and the front limit block 6, and can also prevent it from jumping out of the slide rail 11.

[0026] The utility model adds a deceleration detection for the mobile workbench 2, which makes it slow down in advance, and improves the stability and service life of the limit detection switch of the mobile workbench 2. In addition, the limit position mechanical limit effectively ensures that the mobile workbench 2 moves within the range of the track, avoiding the mobile workbench 2 from jumping out due to the failure of the detection switch.

[0027] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A mobile workbench limit protection device, comprising a work platform, characterized in that: A slide rail is arranged on the working platform, the top of the slide rail is flush with the top of the working platform, the end end of the slide rail is on the working platform, the starting end of the slide rail is outside the working platform, a mobile workbench is arranged on the slide rail, and the mobile workbench is equipped with a front limit mechanism, a rear deceleration limit mechanism and a movable limit mechanism.

2. A movable workbench position limiting protection device according to claim 1, characterized in that: The front limit mechanism comprises a front limit block, which is arranged at the starting end of the slide rail, and a front stop proximity switch is arranged on the top of the front limit block.

3. A movable workbench position limiting protection device according to claim 2, characterized in that: The side of the front limit block facing the movable workbench is processed into a slope.

4. A movable workbench position limiting protection device according to claim 3, characterized in that: The rear deceleration limit mechanism includes a rear mounting block, which is arranged on the working platform and is located on one side of the end end of the slide rail. A deceleration proximity switch is arranged at the front end of the rear mounting block, and a rear stop proximity switch is arranged at the rear end of the rear mounting block.

5. A movable workbench position limiting protection device according to claim 4, characterized in that: The distance between the deceleration proximity switch and the rear stop proximity switch is 10cm to 20cm.

6. A movable workbench position limiting protection device according to claim 5, characterized in that: The movable limiting mechanism comprises an upper limit convex block and a lower limit groove, wherein the upper limit convex block is arranged at the bottom of the movable workbench, and the lower limit groove is arranged on the work platform, and the upper limit convex block and the lower limit groove are matched with each other.

7. A movable workbench position limiting protection device according to claim 6, characterized in that: Four lifting cylinders are arranged in the working platform, and the telescopic ends of the lifting cylinders are respectively connected with a section of movable track, which is a part of the slide rail.

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