A height detection system for push chain lifting equipment

Abstract

A height detection system for a push chain lifting device belongs to the field of lifting device control technology, and includes a device body, a first push chain, a second push chain, a first reference plate, a second reference plate, a cargo pallet, a first proximity switch, a second proximity switch, a controller, and an alarm. The new device only uses two tension and pressure sensors and two proximity switches, has a simple structure, is easy to check and debug, and has a low failure rate. By adopting double detection: tension detection and position change detection, the detection accuracy of the height difference of the push chain is improved, the possibility of missed detection of the height difference is reduced, and the danger caused by the excessive height difference between the two push chains is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting equipment control, and specifically relates to a height detection system for a push chain lifting equipment. Background Art

[0002] The push chain lifting equipment realizes the lifting and lowering of goods through the vertical reciprocating motion of two push chains driven by a motor. Compared with traditional lifting equipment, it can effectively improve the efficiency of lifting goods, and can realize the smooth and rapid lifting and lowering of goods, saving the cost of goods transfer. At present, the push chain lifting equipment is suitable for scenes such as product height lifting of logistics lines and material picking and placing in stereoscopic warehouses. At the same time, it can also be widely used in other application scenes such as automated factories, intelligent warehousing, logistics transportation, etc.

[0003] Since the push chain of the push chain lifting equipment is driven by a motor to perform telescopic movement, in actual use, there will be a problem of inconsistent extension heights of the two push chains. When the height difference between the two push chains is too large, it may cause the goods in the pallet to get stuck or even cause the goods to overturn. Utility Model Content

[0004] In response to the problems of the prior art, the present invention discloses a height detection system for a push chain lifting device, with the aim of solving the following problems existing in the prior art: since the push chain of the push chain lifting device is driven by a motor to perform telescopic movement, in actual use, there will be a problem of inconsistent extended heights of the two push chains. When the height difference between the two push chains is too large, the goods in the pallet may get stuck or even overturn.

[0005] To achieve the above purpose, the technical solution of this novel invention is:

[0006] A height detection system for a push chain lifting device comprises a device body, a first push chain, a second push chain, a first reference plate, a second reference plate, a cargo pallet, a first proximity switch, a second proximity switch, a controller, and an alarm. The device body is arranged horizontally, and two push chain drive boxes are symmetrically arranged on both sides of the bottom of the device body. The bottoms of the two push chain drive boxes respectively extend vertically downward with a first push chain and a second push chain. The bottom ends of the first push chain and the second push chain are commonly fixedly connected with the cargo pallet. The first proximity switch and the second proximity switch are respectively arranged at the positions of the bottom end of the cargo pallet opposite to the first push chain and the second push chain. The bottom end of the device body located outside the first push chain and the second push chain is vertically fixedly connected with the first reference plate and the second reference plate. In an initial state, the cargo pallet is in a horizontal posture, and the horizontal detection distance A between the first proximity switch and the first reference plate is equal to the horizontal detection distance B between the second proximity switch and the second reference plate. The controller is electrically connected to a power supply, and the first proximity switch, the second proximity switch, the alarm, and the push chain drive box are respectively electrically connected to the controller.

[0007] Preferably, the bottom ends of the first push chain and the second push chain are connected to the top end of the cargo pallet via a tension pressure sensor, and the tension pressure sensor is connected to the controller signal via a wire.

[0008] Preferably, the controller is also electrically connected to a display screen via a wire.

[0009] Preferably, the device body moves along the track through a driving mechanism, and the controller is electrically connected to a control circuit of the driving mechanism through a wire.

[0010] The beneficial effects of the height detection system of the new push chain lifting equipment are:

[0011] This new type only uses two tension and pressure sensors and two proximity switches, with a simple structure, easy inspection and debugging, and a low failure rate. By adopting double detection: tension detection and position change detection, the detection accuracy of the height difference of the push chain is improved, the possibility of missed detection of the height difference is reduced, and the danger caused by the excessive height difference between the two push chains is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 , schematic diagram of the overall structure of the new model.

[0013] Figure 2 , the principle block diagram of the new push chain height detection.

[0014] 1. Equipment body; 2. Push chain drive box; 3. First push chain; 4. Second push chain; 5. Cargo pallet; 6. First reference plate; 7. Second reference plate; 8. Pull pressure sensor; 9. First proximity switch; 10. Second proximity switch. DETAILED DESCRIPTION

[0015] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0016] The following embodiments may be understood as a part of a local structure or method that is expressed separately in the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0017] Example 1

[0018] A height detection system for a push chain lifting device, such as Figure 1 As shown, it includes a device body 1, a first push chain 3, a second push chain 4, a first reference plate 6, a second reference plate 7, a cargo pallet 5, a first proximity switch 9, a second proximity switch 10, a controller, and an alarm. The device body 1 is horizontally arranged, and two push chain drive boxes 2 are symmetrically arranged on both sides of the bottom of the device body 1 (for how the push chain drive box drives the push chain to extend and retract, see the prior art content), and the bottoms of the two push chain drive boxes 2 respectively extend vertically downward with the first push chain 3 and the second push chain 4, and the bottom ends of the first push chain 3 and the second push chain 4 are fixedly connected to the cargo pallet 5, and the bottom end of the cargo pallet 5 A first proximity switch 9 and a second proximity switch 10 are respectively provided at positions opposite to the first push chain 3 and the second push chain 4. The bottom end of the equipment body 1 located outside the first push chain 3 and the second push chain 4 is vertically fixedly connected with a first reference plate 6 and a second reference plate 7. In an initial state, the cargo pallet 5 is in a horizontal posture, and the horizontal detection distance A between the first proximity switch 9 and the first reference plate 6 is equal to the horizontal detection distance B between the second proximity switch 10 and the second reference plate 7. The controller is electrically connected to a power supply, and the first proximity switch 9, the second proximity switch 10, the alarm, and the push chain drive box 2 are respectively electrically connected to the controller.

[0019] Example 2

[0020] like Figure 1 As shown, the bottom ends of the first push chain 3 and the second push chain 4 are connected to the top end of the cargo pallet 5 via a tension pressure sensor 8, and the tension pressure sensor 8 is connected to the controller signal via a wire.

[0021] Example 3

[0022] The controller is also electrically connected to a display screen via a wire, which is convenient for real-time viewing of the distance information detected by the first proximity switch 9 and the second proximity switch 10, the pulling pressure data detected by the pulling pressure sensor 8, and the height difference between the first push chain 3 and the second push chain 4.

[0023] Example 4

[0024] The equipment body 1 moves along a track (such as a crane track commonly used in automated warehouses) through a driving mechanism (such as wheels installed at the bottom of the equipment body 1 and a motor for driving the wheels to rotate). The controller is electrically connected to the control circuit of the driving mechanism through a wire. When the height difference between the first push chain 3 and the second push chain 4 exceeds a set value, the movement of the equipment body can be stopped.

[0025] The method of using the new product includes the following steps:

[0026] Step 1: Install a tension pressure sensor between the first and second push chains and the cargo pallet;

[0027] Step 2: Install the first and second reference plates at the bottom of the equipment body on the left and right sides of the cargo pallet respectively, and adjust the installation positions to ensure that the reference plane positions of the first and second reference plates are accurate;

[0028] Step 3: Install the first and second proximity switches directly below the first and second push chains respectively to detect the first and second reference plates on the left and right sides;

[0029] Step 4: Adjust the detection distance between the first proximity switch and the second proximity switch and the first or second reference plate, and ensure that the detection distance is 3 mm ± 0.5 mm;

[0030] Step 5: The first proximity switch detects the first reference plate. When the distance between the first proximity switch and the first reference plate is less than 2 mm, the first proximity switch is triggered and outputs a signal. The controller determines that the height of the first push chain is higher than the height of the second push chain.

[0031] Step 6: The second proximity switch detects the second reference plate. When the distance between the second proximity switch and the second reference plate is less than 2 mm, the second proximity switch is triggered and outputs a signal, and it is determined that the height of the bottom end of the second push chain is higher than the height of the bottom end of the first push chain.

[0032] Step 7: Collect the tension detection values ​​of the two tension and pressure sensors, which are tension pressure one and tension pressure two. The calculation formula is as follows:

[0033]

[0034] When f(x) ≥ 10%, it is determined that the difference in tension between the end of the push chain 1 and the end of the push chain 2 is too large;

[0035] Step 8: When any one of the three conditions of the first proximity switch being triggered, the second proximity switch being triggered and f(x) ≥ 10% is met, it is determined that the height difference between the first push chain and the second push chain is too large, the alarm sounds, the equipment body stops moving, and the push chain drive box 2 adjusts the relative heights of the first and second push chains according to the instructions of the controller.

[0036] As described above, the present invention determines the height difference between the bottom ends of the first and second push chains by detecting the ratio of the tension difference between the first and second push chains and the change in the distance between the cargo pallet and the first and second reference plates, thereby preventing danger caused by an excessively large height difference between the first and second push chains.

Claims

1. A height detection system for a push chain lifting device, characterized by: The utility model comprises an equipment body, a first push chain, a second push chain, a first reference plate, a second reference plate, a cargo pallet, a first proximity switch, a second proximity switch, a controller and an alarm. The equipment body is arranged horizontally, and two push chain drive boxes are symmetrically arranged on both sides of the bottom of the equipment body. The bottoms of the two push chain drive boxes respectively extend vertically downward with the first push chain and the second push chain. The bottom ends of the first push chain and the second push chain are commonly fixedly connected with the cargo pallet. The first proximity switch and the second proximity switch are respectively arranged at the positions of the bottom end of the cargo pallet opposite to the first push chain and the second push chain. The bottom end of the equipment body located outside the first push chain and the second push chain is vertically fixedly connected with the first reference plate and the second reference plate. In the initial state, the cargo pallet is in a horizontal posture, and the horizontal detection distance A between the first proximity switch and the first reference plate is equal to the horizontal detection distance B between the second proximity switch and the second reference plate. The controller is electrically connected with a power supply, and the first proximity switch, the second proximity switch, the alarm and the push chain drive box are respectively electrically connected with the controller.

2. A height detection system for a push chain lifting device as claimed in claim 1, characterized in that: The bottom ends of the first push chain and the second push chain are connected to the top of the cargo pallet via a tension pressure sensor, and the tension pressure sensor is connected to the controller signal via a wire.

3. A height detection system for a push chain lifting device as claimed in claim 1, characterized in that: The controller is also electrically connected to a display screen via a wire.

4. A height detection system for a push chain lifting device as claimed in claim 1, characterized in that: The equipment body moves along the track through a driving mechanism, and the controller is electrically connected to a control circuit of the driving mechanism through a wire.

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