Safety stroke control box capable of preventing stroke switch from being damaged

Abstract

The utility model provides a safety stroke control box capable of preventing a stroke switch from being damaged, which comprises a control box base, two sets of control assemblies, namely a first control assembly and a second control assembly, are symmetrically arranged on the control box base front and back, and a first spring pressing sheet and a second spring pressing sheet are arranged between the two sets of control assemblies. A lead screw of a speed reducer is inserted between the first spring pressing sheet and the second spring pressing sheet; the lead screw is provided with a left rotating assembly and a right rotating assembly which are the same in structure and comprise the first rotating assembly on the left side and the second rotating assembly on the right side, the first rotating assembly and the second rotating assembly are used for controlling the two stroke positions respectively, the first rotating assembly is matched with the first control assembly, and the second rotating assembly and the second control assembly are matched. According to the utility model, when a greenhouse and animal husbandry speed reducer has the phenomena of wrong wiring sequence during installation and debugging, vehicle sliding or failure of a working switch and the like, the travel switch can be prevented from being damaged, and high accuracy and high reliability of triggering the safety travel switch are ensured.

Description

Technical Field

[0001] This utility model relates to a safety travel control box, and more particularly to a safety travel control box for preventing damage to travel switches. Background Technology

[0002] Existing large greenhouses and livestock sheds typically use speed reducers with safety travel control to operate the skylight mechanism. When a phase sequence error occurs, causing the travel switch to malfunction, the safety switch will be triggered, stopping the speed reducer and preventing it from overtraveling and damaging the greenhouse or livestock shed.

[0003] The existing patent CN219262108U mentions a safety travel control box. In the event of overtravel, the swing arm of the limit switch within the safety travel control box is easily deformed, leading to changes in the travel setting and potentially damaging greenhouses and livestock sheds. The existing RIDDER brand offers a product with a safety travel control box, but the manufacturing process and quality of the spring sheet in its structure are difficult to control, resulting in poor accuracy of the safety travel and potentially damaging greenhouses and livestock sheds. Utility Model Content

[0004] This utility model provides a safety travel control box to prevent damage to the limit switch, which solves the problem of losses caused by limit switch failure in the safety travel control box. The technical solution is as follows:

[0005] A safety travel control box for preventing damage to limit switches includes a control box base. Two sets of control components, arranged symmetrically front to back, are mounted on the control box base. These are divided into a first control component and a second control component. A first spring pressure plate and a second spring pressure plate are disposed between the two control components. A lead screw of a speed reducer is inserted between the first and second spring pressure plates. The lead screw has two sets of identical rotating components, a first rotating component on the left and a second rotating component on the right, which are used to control two travel positions respectively. The first rotating component cooperates with the first control component, and the second rotating component cooperates with the second control component.

[0006] The control assembly includes a working switch assembly and a safety switch assembly arranged vertically. The working switch assembly is mounted on the control box base via a working switch assembly mounting plate. One end of the working switch assembly is connected to the working switch assembly mounting plate via a first pin, and the other end is connected to a first elastic body. The first elastic body is mounted on a second pin on the working switch assembly mounting plate. The safety switch assembly is mounted on the control box base. One end of the safety switch assembly is connected to the control box base via a third pin, and the other end is connected to a second elastic body. The second elastic body is mounted on a fourth pin on the control box base. The first and third pins are located on the same side, and the second and fourth pins are also located on the same side.

[0007] The working switch assembly includes a first limit switch, a first elastic body pressure arm, and a first screw. The first limit switch is fixedly connected to the first elastic body pressure arm by the first screw.

[0008] The first elastic body is a first torsion spring, one end of the first torsion spring is in contact with the first elastic body pressure arm of the working switch assembly, and the other end is in contact with the side wall of the mounting plate of the working switch assembly.

[0009] The safety switch assembly includes a second limit switch, a second elastic body pressure arm, and a second screw. The second limit switch is fixedly connected to the second elastic body pressure arm by the second screw.

[0010] One end of the second torsion spring contacts the second elastic body pressure arm of the safety switch assembly, and the other end contacts the side wall of the control box base.

[0011] The lead screw is threaded, and the rotating assembly includes a locking block, an annular block, and a knurled nut. The annular block is equipped with a lever. The locking block is fixed to the lead screw, the knurled nut is fitted onto the lead screw, and the lever is fixed to the knurled nut via the annular block. When the lead screw rotates, the knurled nut and the lever move linearly together on the lead screw. When the knurled nut causes the annular block to contact the locking block on the same side, the annular block locks the locking block, and the lever's rotation will press down the spring.

[0012] The left side of the first spring pressure plate is fixed to the control box base via the first slot, while the right side can swing and approach the first control component; the right side of the second spring pressure plate is fixed to the control box base via the second slot, while the left side can swing and approach the second control component.

[0013] It is also equipped with wiring terminals, which are fixedly connected to the base of the control box.

[0014] It also includes a control box cover that mates with the control box base, the control box cover being fixedly connected to the control box base by screws.

[0015] The safety travel control box, designed to prevent damage to the limit switches, prevents damage to the limit switches in greenhouses and livestock industries when issues arise such as incorrect wiring during installation and commissioning, runaway mechanisms, or malfunctioning work switches. It also ensures high accuracy and reliability in triggering the safety travel switches. This reduces the probability of reducer travel failures, minimizes unnecessary losses caused by safety travel control box malfunctions, and improves safety and stability in greenhouses and livestock industries during curtain-raising and window-opening operations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the application of the safety travel control box for preventing damage to the limit switch;

[0017] Figure 2 This is an external schematic diagram of the safety travel control box for preventing damage to the limit switch;

[0018] Figure 3 This is an internal schematic diagram of the safety travel control box for preventing damage to the limit switch;

[0019] Figure 4 This is a three-dimensional schematic diagram of the safety travel control box for preventing damage to the limit switch;

[0020] Figure 5 This is a schematic diagram of the structure of the operating switch assembly;

[0021] Figure 6 This is a schematic diagram of the structure of the safety switch assembly;

[0022] Figure 7 This is a schematic diagram of the lead screw driving the locking block to squeeze the first control component. Detailed Implementation

[0023] like Figure 1 As shown, the safety travel control box 101, which prevents damage to the limit switch, is fixed to the reducer 100 by bolts 10. The reducer 100 is connected to the motor, as shown below. Figure 7 As shown, the first gear 28 and the second gear 29 are both used to connect the potentiometer. The first gear 28 and the second gear 29 cooperate with each other. The second gear 29 is installed on the left end of the lead screw 30. The right side of the lead screw 30 is provided with a transmission component, a synchronous belt and a pulley for driving the lead screw 30 to rotate. The two ends of the lead screw 30 are fixed to the reducer housing below the safety stroke control box 101 by bearings.

[0024] like Figure 2As shown, the safety travel control box 101 for preventing damage to the limit switch includes a control box base 1, a control box cover 2, and a terminal block 6. The control box base 1 and the control box cover 2 cooperate with each other and are fixedly connected around the periphery by screws 4, forming the outer shell of the safety travel control box 101. A terminal block 6 is provided on the rear side of the outer shell, and the terminal block 6 is fixedly connected to the control box base 1. Inside the outer shell, a first spring pressure plate 3 and a second spring pressure plate 5 are arranged front to back. The left side of the first spring pressure plate 3 is fixed to the control box base 1 through a first slot, and the right side can swing. The right side of the second spring pressure plate 5 is fixed to the control box base 1 through a second slot, and the left side can swing. Between the first spring pressure plate 3 and the second spring pressure plate 5 is a lead screw 30 driven by a reducer 100.

[0025] Combination Figure 3 and Figure 4 As shown, the safety travel control box 101 contains two sets of control components arranged front to back, namely a first control component and a second control component. Each control component includes a safety switch component, a working switch component mounting plate, and a working switch component. The working switch component is located above the safety switch component and is mounted on the working switch mounting plate, which is fixedly mounted to the control box base 1. The safety switch component is directly mounted on the control box base 1. Thus, the safety travel control box 101 contains two sets of safety switch components, two sets of working switch component mounting plates, and two working switch components. A lead screw 30 connects the first control component and the second control component. A first spring pressure plate 3 is provided between the first control component and the lead screw, and a second spring pressure plate 5 is provided between the second control component and the lead screw. The terminal block 6 is located outside the second control component.

[0026] The first control component is located at the front end of the safety travel control box 101 and includes a first working switch assembly 7, a first working switch assembly mounting plate 8, and a first safety switch assembly 20. The first working switch assembly mounting plate 8 is fixed to the control box base 1 by a first self-tapping screw 9. The left side of the first working switch assembly 7 is connected to the first working switch assembly mounting plate 8 by a first pin. A second pin is provided on the right side of the first working switch assembly mounting plate 8, and a first torsion spring 11 is installed on the second pin. One end of the first torsion spring 11 contacts the first elastic body pressure arm 12 of the first working switch assembly 7, and the other end contacts the side wall of the first working switch assembly mounting plate 8.

[0027] Combination Figure 5As shown, the first working switch assembly 7 includes a first limit switch 13, a first elastic body pressure arm 12, and a first screw 26. One end of the first limit switch 13 is fixedly connected to the first elastic body pressure arm 12 by the first screw 26. The first limit switch 13 is located between the first elastic body pressure arm 12 and the first spring pressure plate 3. Through the action of the first torsion spring 11, the first elastic body pressure arm 12 of the first working switch assembly 7 tends towards the first spring pressure plate 3. Limited by the first pin, the first working switch assembly 7 can remain stable on the first working switch assembly mounting plate 8. When the first spring pressure plate 3 applies force to the first limit switch 13 to a certain position, the first elastic body pressure arm 12 can further compress the first torsion spring 11 and cause the first elastic body pressure arm 12 to rotate around the first pin, preventing the swing arm of the first limit switch 13 from being damaged.

[0028] The left side of the first safety switch assembly 20 is connected to the control box base 1 via a third pin. A fourth pin is provided on the right side of the control box base 1, and a second torsion spring 21 is mounted on the fourth pin. One end of the second torsion spring 21 contacts the second elastic body pressure arm 22 of the first safety switch assembly 20, and the other end contacts the side wall of the control box base 1. Figure 6 As shown, the first safety switch assembly 20 includes a second limit switch 23, a second elastic body pressure arm 22, and a second screw 27. One end of the second limit switch 23 is fixedly connected to the second elastic body pressure arm 22 by the second screw 27. The second limit switch 23 is located between the second elastic body pressure arm 22 and the first spring pressure plate 3. Through the action of the second torsion spring 21, the second elastic body pressure arm 22 of the first safety switch assembly 20 tends towards the first spring pressure plate 3. Limited by the third pin, the first safety switch assembly 20 can remain stable on the control box base 1. When the first spring pressure plate 3 applies force to the second limit switch 23 to a certain position, the second elastic body pressure arm 22 can further compress the second torsion spring 21 and cause the second elastic body pressure arm 22 to rotate around the third pin, preventing the swing arm of the second limit switch 23 from being damaged.

[0029] The first and third pins are located on the same side, with the first pin positioned above the third pin; they can also use the same pin. Similarly, the second and fourth pins are located on the same side, with the second pin positioned above the fourth pin; they can also use the same pin.

[0030] Similarly, the second control component is located at the rear end of the safety travel control box 101, and its working principle is the same as that of the first control component. It includes a second working switch assembly 14, a second working switch assembly mounting plate 15, and a second safety switch assembly 24. The second working switch assembly mounting plate 15 is fixed to the control box base 1 by a second self-tapping screw 16. The right side of the second working switch assembly 14 is connected to the second working switch assembly mounting plate 15 by a fifth pin, and a sixth pin is installed on the left side of the second working switch assembly mounting plate 15. A third torsion spring 17 is installed on the sixth pin of the second working switch assembly mounting plate 15. One end of the third torsion spring 17 contacts the third elastic body pressure arm 18 of the second working switch assembly 14, and the other end contacts the side wall of the second working switch assembly mounting plate 15. The second working switch assembly 14 includes a third travel switch 19, a third elastic body pressure arm 18, and a third screw. One end of the third travel switch 19 is fixedly connected to the third elastic body pressure arm 18 by a third screw.

[0031] The right side of the second safety switch assembly 24 is connected to the control box base 1 via a seventh pin. An eighth pin is located on the left side of the control box base 1, and a fourth torsion spring 25 is mounted on this eighth pin. One end of the fourth torsion spring 25 contacts the fourth elastic body pressure arm of the second safety switch assembly 24, and the other end contacts the side wall of the control box base 1. The second safety switch assembly 24 includes a fourth limit switch, a fourth elastic body pressure arm, and a fourth screw. One end of the fourth limit switch is fixedly connected to the fourth elastic body pressure arm via the fourth screw.

[0032] Furthermore, the torsion spring described above can also utilize other forms of elastomers, such as compression springs, tension springs, and rubber. Using a torsion spring eliminates the need for additional connectors to link the elastomer compression arm to the torsion spring. If other elastomers are used, additional connectors may be required to link the elastomer compression arm to the torsion spring.

[0033] like Figure 7As shown, the lead screw 30 has a thread 31. Two sets of identical rotating components are installed on the lead screw 30: a first rotating component on the left and a second rotating component on the right. These two sets of rotating components control two stroke positions, one corresponding to opening (pull) and the other to closing (retract). The first rotating component cooperates with the first control component, and the second rotating component cooperates with the second control component. Each rotating component includes a locking block, an annular block, and a knurled nut. The annular block has a lever. The locking block is fixed to the lead screw, the knurled nut is fitted onto the lead screw, and the lever is fixed to the knurled nut via the annular block. When the lead screw rotates (in two directions), the knurled nut and the lever move linearly along the lead screw. When the knurled nut causes the annular block to contact the locking block on the same side, the annular block engages, and the lever rotates to press down the spring.

[0034] The first rotating assembly includes a first locking block 32, a first annular block 33, and a first knurled nut 34. The first annular block 33 is provided with a first lever 35, which is fixed to the first knurled nut 34 via the first annular block 33. Similarly, the second rotating assembly includes a second locking block 36, a second annular block 37, and a second knurled nut 38. The second annular block 37 is provided with a second lever 39, which is fixed to the second knurled nut 38 via the second annular block 37. The first locking block 32 and the second locking block 36 are fixed at both ends of the lead screw 30. The first knurled nut 34 can rotate after contacting the first locking block 32, and the second knurled nut 38 can rotate after contacting the second locking block 36.

[0035] In use, taking the first control component as an example, the motor of the reducer 100 drives the internal gear to rotate, transmitting power to the lead screw 30 connected to the reducer. This causes the lead screw 30 to rotate, which in turn drives the locking block to rotate synchronously. When the set stroke is reached, the knurled nut causes the annular block to contact the locking block on the same side and begin to rotate synchronously with it, thus pressing down the lever. There are three possible scenarios during this pressing down:

[0036] (1) When the first spring pressure plate 3 is pressed down by the first lever 39, the switch contact on the first working switch assembly 7 is triggered. At this time, the force of triggering the switch contact is less than the force of compression of the first torsion spring 11. The first working switch assembly 7 will not rotate around the first pin shaft, so that the motor of the reducer cuts off the power and stops rotating.

[0037] (2) When the speed reducer 100 has problems such as incorrect wiring sequence during installation and debugging or failure of the working switch, the first spring pressure plate 3 will continue to be pressed down. At this time, the force of triggering the switch is greater than the force of compression of the first torsion spring 11. The first working switch assembly 7 will rotate around the first pin shaft to avoid the first spring pressure plate 3 until the switch contact on the first safety switch assembly 20 is triggered, so that the speed reducer motor cuts off the power and stops rotating.

[0038] (3) When the reducer 100 slips, the first spring pressure plate 3 will continue to be pressed down. At this time, the force pressing down the first working switch contact will continue to increase. When the first working switch assembly 7 continues to rotate around the first pin shaft, the first safety switch assembly 20 begins to rotate around the third pin shaft to avoid the first spring pressure plate 3, thereby preventing the swing arm of the first limit switch 13 of the first working switch assembly 7 from being deformed and damaged.

[0039] The safety travel control box, designed to prevent damage to the limit switches, prevents damage to the limit switches in greenhouses and livestock industries when issues arise such as incorrect wiring during installation and commissioning, runaway mechanisms, or malfunctioning work switches. It also ensures high accuracy and reliability in triggering the safety travel switches. This reduces the probability of reducer travel failures, minimizes unnecessary losses caused by safety travel control box malfunctions, and improves safety and stability in greenhouses and livestock industries during curtain-raising and window-opening operations.

Claims

1. A safety travel control box for preventing damage to limit switches, characterized in that: The system includes a control box base on which two sets of control components are mounted, arranged symmetrically front to back. These components are a first control component and a second control component. A first spring pressure plate and a second spring pressure plate are positioned between the two control components. A lead screw of a speed reducer is inserted between the first spring pressure plate and the second spring pressure plate. The lead screw has two sets of identical rotating components, a first rotating component on the left and a second rotating component on the right, which are used to control two stroke positions respectively. The first rotating component cooperates with the first control component, and the second rotating component cooperates with the second control component.

2. The safety travel control box for preventing damage to the limit switch according to claim 1, characterized in that: The control assembly includes a working switch assembly and a safety switch assembly arranged vertically. The working switch assembly is mounted on the control box base via a working switch assembly mounting plate. One end of the working switch assembly is connected to the working switch assembly mounting plate via a first pin, and the other end is connected to a first elastic body. The first elastic body is mounted on a second pin on the working switch assembly mounting plate. The safety switch assembly is mounted on the control box base. One end of the safety switch assembly is connected to the control box base via a third pin, and the other end is connected to a second elastic body. The second elastic body is mounted on a fourth pin on the control box base. The first and third pins are located on the same side, and the second and fourth pins are also located on the same side.

3. The safety travel control box for preventing damage to the limit switch according to claim 2, characterized in that: The working switch assembly includes a first limit switch, a first elastic body pressure arm, and a first screw. The first limit switch is fixedly connected to the first elastic body pressure arm by the first screw.

4. The safety travel control box for preventing damage to the limit switch according to claim 3, characterized in that: The first elastic body is a first torsion spring, one end of the first torsion spring is in contact with the first elastic body pressure arm of the working switch assembly, and the other end is in contact with the side wall of the mounting plate of the working switch assembly.

5. The safety travel control box for preventing damage to the limit switch according to claim 2, characterized in that: The safety switch assembly includes a second limit switch, a second elastic body pressure arm, and a second screw. The second limit switch is fixedly connected to the second elastic body pressure arm by the second screw.

6. The safety travel control box for preventing damage to the limit switch according to claim 5, characterized in that: A fourth pin is provided on the right side of the control box base, and a second torsion spring is installed on the fourth pin. One end of the second torsion spring contacts the second elastic body pressure arm of the safety switch assembly, and the other end contacts the side wall of the control box base.

7. The safety travel control box for preventing damage to the limit switch according to claim 1, characterized in that: The lead screw is threaded, and the rotating assembly includes a locking block, an annular block, and a knurled nut. The annular block is equipped with a lever. The locking block is fixed to the lead screw, the knurled nut is fitted onto the lead screw, and the lever is fixed to the knurled nut via the annular block. When the lead screw rotates, the knurled nut and the lever move linearly together on the lead screw. When the knurled nut causes the annular block to contact the locking block on the same side, the annular block locks the locking block, and the lever's rotation will press down the spring.

8. The safety travel control box for preventing damage to the limit switch according to claim 1, characterized in that: The left side of the first spring pressure plate is fixed to the control box base via the first slot, while the right side can swing and approach the first control component; the right side of the second spring pressure plate is fixed to the control box base via the second slot, while the left side can swing and approach the second control component.

9. The safety travel control box for preventing damage to the limit switch according to claim 1, characterized in that: It is also equipped with wiring terminals, which are fixedly connected to the base of the control box.

10. The safety travel control box for preventing damage to the limit switch according to claim 1, characterized in that: It also includes a control box cover that mates with the control box base, the control box cover being fixedly connected to the control box base by screws.

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