Rotary locking and unlocking device

Abstract

The rotary locking and unlocking device of the present invention comprises a track, a cargo vehicle is mounted on the track, a support frame is mounted above the track, a locking cylinder and an unlocking cylinder are mounted on the support frame, a fixed base is mounted on the cargo vehicle at the rear box plate, a tripod and a toggle bracket are rotatably connected to the fixed base, locking protrusions are arranged at two corners of the tripod, an arc-shaped inner concave edge is arranged between the two locking protrusions, a guide wheel A is rotatably mounted at one corner on one side of the arc-shaped inner concave edge, a guide wheel B is rotatably mounted at the middle part of the arc-shaped inner concave edge, an inclined pressure block is arranged at the output end of the locking cylinder, the inclined pressure block is provided with an inclined surface matching with the guide wheel A and the guide wheel B, and a trapezoidal guide boss is arranged on the side opposite to the guide wheel A; the toggle bracket is provided with a linkage rod extending toward the trapezoidal guide boss, and a guide wheel C and a guide wheel D are rotatably mounted on one side of the linkage rod; the present invention has a compact and ingenious structure, realizes automatic locking and unlocking functions, and improves working efficiency.

Description

Technical Field

[0001] The invention relates to the field of locking devices, in particular to a rotary locking and unlocking device. Background Art

[0002] Some production environments in industrial production require the use of special vehicles to load products. The vehicles travel along the track and move back and forth on the track to transfer the products from one fixed point to another. After completing the corresponding work, they return to the original point and circulate. Due to their own characteristics, some powder products require the vehicle to keep the product stable during operation, and no shaking is allowed to cause leakage. For this reason, a locking device is generally installed on the vehicle to lock the box loaded with the product. When the vehicle arrives at the destination with the loaded product, the locking device needs to be unlocked before unloading operations can be carried out. At present, there are two general locking devices: 1. A screw mechanism is used to lock or unlock the screw by human rotation. This structure has the following problems: poor personnel safety during vehicle operation, continuous locking and unlocking operations, very high labor intensity, and also reduces vehicle transportation efficiency; 2. The use of complex transmission mechanisms requires precise positioning, and very high requirements for parking position accuracy, and manual intervention is often required due to parking position deviation. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of the above-mentioned existing locking devices and to provide a rotary locking and unlocking device.

[0004] The specific scheme of the present invention is: a rotary locking and unlocking device comprises a track, a carrier for loading products is installed on the track, a support frame is installed above the track, a locking cylinder is installed on the support frame corresponding to the locking position, and an unlocking cylinder is installed corresponding to the unlocking position, a fixed base is installed on the carrier at the rear box plate, a tripod and a toggle bracket are installed on the fixed base, one corner of the tripod is rotatably connected to the fixed base, one end of the toggle bracket is rotatably connected to the fixed base, locking protrusions are provided at the other two corners of the tripod, an arc-shaped inner concave edge is provided between the two locking protrusions, one side of the arc-shaped inner concave edge is located at one corner and a guide wheel A is rotatably installed, the middle part of the arc-shaped inner concave edge is located on the same side of the guide wheel A and a guide wheel B is rotatably installed, the output end of the locking cylinder is provided with an inclined pressure block, and the inclined pressure block is provided with a locking protrusion connected to the guide wheel A and the guide wheel B. A matching inclined surface, a trapezoidal guide boss is provided on the side opposite to the guide wheel A; the toggle bracket is provided with a linkage rod extending toward the trapezoidal guide boss, and a guide wheel C and a guide wheel D are rotatably mounted on one side of the linkage rod, and both the guide wheel C and the guide wheel D cooperate with the trapezoidal guide boss to realize driving the tripod by the toggle bracket, and when the two locking protrusions of the tripod are located in the same vertical plane, it is in a locked state, and at this time, the guide wheel C and the guide wheel D are respectively located at the two inclined surfaces of the trapezoidal guide boss; when the two locking protrusions of the tripod are facing upward, it is in an unlocked state, and at this time, the guide wheel D contacts the trapezoidal guide boss, and the guide wheel C is separated from the trapezoidal guide boss; a toggle rod is provided on the toggle bracket, and the toggle rod cooperates with the unlocking cylinder to drive the toggle bracket to rotate by pressing down the unlocking cylinder, thereby driving the tripod to rotate in the unlocking direction.

[0005] Furthermore, when the unlocking cylinder descends to the bottom, the center of gravity of the tripod is located on the side of the fixed base away from the product, so that the tripod maintains an unlocked state under the action of its own weight.

[0006] Furthermore, when the locking cylinder is pressed downward, the inclined surface of the inclined pressure block first contacts the guide wheel A. As the tripod rotates to a certain angle in the locking direction, the guide wheel B and the guide wheel A contact the inclined surface at the same time. At this time, the guide wheel B is located at a position where the rotation center of the tripod is offset in the locking direction.

[0007] Furthermore, when the tripod is in a locked state, a clamping platform is provided at the top of one corner at the upper end, and a clamping block corresponding to the position of the clamping platform is installed at the output end of the locking cylinder.

[0008] Furthermore, when the unlocking cylinder is pressed downward to cause the tripod to rotate from the locked position to the unlocking direction, the guide wheel C first contacts the inclined surface on one side corresponding to the trapezoidal guide boss, thereby increasing the rotational torque of the tripod during startup. When the tripod rotates to a certain angle, the guide wheel C disengages from the trapezoidal guide boss, and the guide wheel D contacts the inclined surface on one side corresponding to the trapezoidal guide boss.

[0009] Furthermore, the fixed base is provided with a limit screw, and the limit screw is used to limit the tripod to maintain a set angle when it is in an unlocked state.

[0010] Compared with the prior art, the present invention has the following advantages: 1. It can realize locking and unlocking at a fixed position, the locking function is stable, the vehicle can remain locked when running, and it replaces the method of manually twisting the screw mechanism, thereby improving the working efficiency and greatly reducing the labor intensity; 2. The structure is compact and ingenious. Compared with the traditional complex transmission mechanism, it reduces the requirements for parking position accuracy, and the production cost is greatly reduced, the maintenance cost is reduced, and the economic benefit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the structure of the present invention in a locked position;

[0012] Figure 2 It is a schematic diagram of the position change of the tripod during the pressing process of the locking cylinder of the present invention;

[0013] Figure 3 is a schematic diagram of the structure of the present invention in the unlocked position;

[0014] Figure 4 It is a schematic diagram of the position changes of the tripod and the toggle bracket during the process of the unlocking cylinder being pressed down in the present invention;

[0015] Figure 5 It is a schematic diagram of the overall structure of the present invention;

[0016] In the figure: 1-carrier, 2-fixed base, 3-rear box plate, 4-tripod, 41-guide wheel A, 42-locking protrusion, 43-guide wheel B, 44-trapezoidal guide boss, 45-inclined surface, 46-pressing platform, 5-sliding bracket, 51-sliding rod, 52-linking rod, 53-guide wheel C, 54-guide wheel D, 6-limiting screw, 7-unlocking cylinder, 8-pressing head, 9-locking cylinder, 10-inclined pressing block, 11-pressing block, 12-track. DETAILED DESCRIPTION

[0017] See also Figure 1 , Figure 3 , Figure 5, this embodiment is a rotary locking and unlocking device, including a track 12, on which a carrier vehicle 1 for loading products is installed. Above the track 12, there is a support frame. On the support frame, a locking oil cylinder 9 is installed corresponding to the locking position, and an unlocking oil cylinder 7 is installed corresponding to the unlocking position. On the carrier vehicle 1, at the rear box plate 3, there is a fixed base 2. On the fixed base 2, a tripod 4 and a toggle bracket 5 are installed. One corner of the tripod 4 is rotatably connected to the fixed base 2, and one end of the toggle bracket 5 is rotatably connected to the fixed base 2. At the other two corners of the tripod 4, there are locking protrusion parts 42. Between the two locking protrusion parts 42, there is an arc-shaped concave edge. On one side of the arc-shaped concave edge at one corner, a guide wheel A41 is rotatably installed. In the middle of the arc-shaped concave edge on the same side as the guide wheel A41, a guide wheel B43 is rotatably installed. The output end of the locking oil cylinder 9 is equipped with an inclined pressure block 10. The inclined pressure block 10 is provided with an inclined surface that cooperates with the guide wheel A41 and the guide wheel B43, and on one side surface opposite to the guide wheel A41, there is a trapezoidal guide boss 44; the toggle bracket 5 is provided with a linkage rod 52 extending towards the trapezoidal guide boss 44. On one side of the linkage rod 52, a guide wheel C53 and a guide wheel D54 are rotatably installed. Both the guide wheel C53 and the guide wheel D54 cooperate with the trapezoidal guide boss 44 to drive the tripod 4 through the toggle bracket 5.

[0018] During the specific working process, when the locking action is performed, refer to Figure 2 , the actions of each component are as follows:

[0019] 1. The locking oil cylinder 9 presses down, and the bottom inclined surface K of the inclined pressure block 10 moves downward;

[0020] 2. The guide wheel A41 first contacts the K surface. At this time, the position of the guide wheel A41 is at Figure 2 O' in, and under the pushing action of the K surface, the tripod 4 is driven to rotate counterclockwise through the guide wheel A41;

[0021] 3. When the tripod 4 rotates to a certain angle, the guide wheel B43 also contacts the K surface. At this time, the guide wheel B43 is at the starting section of the K surface; to meet this requirement, it is designed that the distance from the guide wheel B43 to the rotation center is less than the distance from the guide wheel A41 to the rotation center, that is, P''M < O''M, and P'' is on the left side of the vertical plane where the M point is located, to prevent rotation jamming;

[0022] 4. As the tripod 4 continues to rotate, the guide wheel A41 leaves the K surface, and the K surface continues to push the tripod 4 to rotate counterclockwise through the guide wheel B43 until, under the action of its own weight, the tripod 4 continues to rotate towards the rear box plate 3;

[0023] In this embodiment, two guide wheels (guide wheel A41 and guide wheel B43) are designed to limit the positions of the two guide wheels simultaneously because when the locking cylinder 9 presses down, relying solely on guide wheel A41 is insufficient to drive the tripod 4 to rotate counterclockwise until the center of gravity of the tripod 4 shifts to the left. Therefore, guide wheel A41 is used to drive the tripod 4 to rotate by a certain angle, and then guide wheel B43 takes over to continue driving the tripod 4 to rotate until the center of gravity of the tripod 4 shifts to the left. Then, it can rotate to the locking position under the combined action of its own weight and the pushing force of the cylinder;

[0024] 5. The pressing block 11 of the locking cylinder 9 presses the pressing platform 46 of the tripod 4 in place;

[0025] 6. The resultant force direction of the locking forces E and F is within <EMF, thus ensuring self-locking ability and maintaining the locked state during the operation of the carrier vehicle 1.

[0026] When the carrier vehicle moves to the unlocking position for unlocking, refer to Figure 4 , and the actions of each component are as follows:

[0027] 1. The unlocking cylinder 7 presses down, and the bottom H surface of the pressing head 8 slides on the G surface of the lever 51, driving the entire拨动支架 5 to rotate clockwise through the lever 51. The tripod 4 rotates around point M, and the拨动支架 5 rotates around point N;

[0028] 2. Guide wheels C53 and D54 are installed on the linkage rod 52 of the拨动支架 5. Guide wheel C53 moves along the AB surface of the trapezoidal guide boss 44, and guide wheel D54 moves along the CD surface. At the start, guide wheel C53 contacts the AB surface first, generating a rotational torque to drive the tripod 4 to rotate clockwise. At this time, the distance NE is long, which is convenient for overcoming the resistance of the tripod 4 to leave the locked state;

[0029] 3. After the tripod 4 rotates clockwise by a certain angle, guide wheel C53 leaves the AB surface, and guide wheel D54 starts to contact the CD surface. At this time, the driving torque of the拨动支架 5 only needs to overcome the torque generated by the self-weight of the tripod 4;

[0030] In this embodiment, the reason for designing two guide wheels (guide wheels C53 and D54) on the拨动支架 5 to cooperate with the two inclined surfaces of the trapezoidal guide boss 44 is that a sufficiently large torque is required to drive the tripod 4 at the start, and the lever arm of guide wheel C53 to the rotation center is longer, so it is more conducive to driving the tripod 4. However, relying solely on guide wheel C53 cannot rotate the tripod 4 until the center of gravity shifts to the right of the rotation center. Therefore, guide wheel D54 takes over. After the tripod 4 rotates by a certain angle, guide wheel D54 continues to push the tripod 4 to rotate until the center of gravity shifts to the right of the rotation center;

[0031] 4. The H surface continues to press down until the center of gravity of the tripod 4 shifts to the right side of the rotation center N, and the tripod 4 remains unlocked under the action of its own weight. At this time, the unlocking cylinder 7 can be retracted.

[0032] When the tripod 4 is in the unlocked state, a moving space is reserved for the rear box plate 3, which is convenient for unloading related operations.

Claims

1. A rotary locking and unlocking device, characterized in that: The invention comprises a track, on which a cargo carrier for loading products is mounted, a support frame is mounted above the track, a locking cylinder is mounted on the support frame corresponding to the locking position, and an unlocking cylinder is mounted corresponding to the unlocking position, a fixed base is mounted on the cargo carrier at the rear box plate, a tripod and a toggle bracket are mounted on the fixed base, one corner of the tripod is rotatably connected to the fixed base, one end of the toggle bracket is rotatably connected to the fixed base, locking protrusions are arranged at the other two corners of the tripod, an arc-shaped inner concave edge is arranged between the two locking protrusions, one side of the arc-shaped inner concave edge is located at one corner and a guide wheel A is rotatably mounted thereon, the middle part of the arc-shaped inner concave edge is located on the same side of the guide wheel A and a guide wheel B is rotatably mounted thereon, an inclined pressure block is arranged at the output end of the locking cylinder, the inclined pressure block is provided with an inclined surface matching with the guide wheel A and the guide wheel B, and the inclined surface opposite to the guide wheel A A trapezoidal guide boss is provided on one side; the toggle bracket is provided with a linkage rod extending toward the trapezoidal guide boss, and a guide wheel C and a guide wheel D are rotatably mounted on one side of the linkage rod, and both the guide wheel C and the guide wheel D cooperate with the trapezoidal guide boss to realize driving the tripod through the toggle bracket, and when the two locking protrusions of the tripod are located in the same vertical plane and are tightly attached to the rear box plate, it is in a locked state, and at this time, the guide wheel C and the guide wheel D are respectively located at the two inclined surfaces of the trapezoidal guide boss; when the two locking protrusions of the tripod are facing upward, it is in an unlocked state, and at this time, the guide wheel D contacts the trapezoidal guide boss, and the guide wheel C is separated from the trapezoidal guide boss; a toggle rod is provided on the toggle bracket, and the toggle rod cooperates with the unlocking cylinder to drive the toggle bracket to rotate by pressing down the unlocking cylinder, thereby driving the tripod to rotate in the unlocking direction.

2. The rotary locking and unlocking device according to claim 1, characterized in that: When the unlocking oil cylinder descends to the bottom, the center of gravity of the tripod is located at a side of the fixed base away from the product, so that the tripod maintains an unlocked state under the action of its own weight.

3. The rotary locking and unlocking device according to claim 1, characterized in that: When the locking cylinder is pressed down, the inclined surface of the inclined pressure block first contacts the guide wheel A. As the tripod rotates to a certain angle in the locking direction, the guide wheel B and the guide wheel A contact the inclined surface at the same time. At this time, the guide wheel B is located at a position where the rotation center of the tripod is offset in the locking direction.

4. The rotary locking and unlocking device according to claim 1, characterized in that: When the tripod is in a locked state, a clamping platform is provided at the top of one corner at the upper end, and a clamping block corresponding to the position of the clamping platform is installed at the output end of the locking oil cylinder.

5. The rotary locking and unlocking device according to claim 1, characterized in that: When the unlocking cylinder is pressed down to rotate the tripod from the locked position to the unlocking direction, the guide wheel C first contacts the inclined surface on one side corresponding to the trapezoidal guide boss, thereby increasing the rotational torque of the tripod during startup. When the tripod rotates to a certain angle, the guide wheel C disengages from the trapezoidal guide boss, and the guide wheel D contacts the inclined surface on one side corresponding to the trapezoidal guide boss.

6. The rotary locking and unlocking device according to claim 1, characterized in that: The fixing base is provided with a limit screw, and the limit screw is used to limit the tripod to maintain a set angle when it is in an unlocked state.

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