Synchronously unlockable carrier and unlock device therefor

Abstract

This invention relates to a carrier capable of synchronous locking and unlocking, and an unlocking device thereon. It improves the structure of the locks on the carrier, eliminating the need to rotate the entire lock cylinder during locking or unlocking; instead, only a knob needs to be driven. The knob's rotation is only subject to friction, resulting in minimal force on the unlocking claws. This low-torque transmission characteristic effectively avoids the skipping of synchronous belt teeth, ensuring the reliability and synchronization accuracy of multiple locks working together. Therefore, this invention can use a single motor to simultaneously drive multiple unlocking claws via a synchronous belt, synchronously locking or unlocking all locks on the carrier. Compared to the existing technology that requires an independent motor for each lock, this significantly reduces the number of driving components, lowers the complexity and hardware cost of the control system, and reduces subsequent maintenance frequency and difficulty. It also avoids timing deviations that may occur in multi-motor coordinated control, thus improving the stability and production efficiency of the production line.

Description

Technical Field

[0001] This invention belongs to the field of semiconductor processing technology, and particularly relates to a carrier capable of synchronous unlocking and an unlocking device thereon. Background Technology

[0002] In the processing of substrate products, the products, after being processed in the previous steps, need to be placed in a carrier before being sent into a high-temperature reflow oven. The carrier usually consists of a carrier plate and a cover plate, which are locked together by evenly distributed locking devices to ensure the stability and positional accuracy of the product during transportation and heating.

[0003] Traditional locks (see Chinese Patent No. CN212665363U) require the unlocking component to drive the entire lock cylinder to rotate during locking or unlocking. This transmission method results in the unlocking component experiencing significant torque during operation. When a single motor drives multiple unlocking components simultaneously via a timing belt to lock or unlock multiple locks synchronously, the timing belt is prone to skipping teeth due to momentary overload, leading to transmission failure or asynchronous operation. Therefore, limited by the structural characteristics of existing locks, traditional designs must employ multiple motors to drive each lock separately, which undoubtedly increases equipment cost, control complexity, and maintenance difficulty. Summary of the Invention

[0004] Based on this, and in response to the aforementioned technical problems, a vehicle capable of simultaneous unlocking and its unlocking device are provided.

[0005] The technical solution adopted in this invention is as follows: As a first aspect of the present invention, a carrier capable of simultaneous upper and lower unlocking is provided, comprising a carrier plate and a cover plate, and having a plurality of evenly distributed locks thereon. The carrier plate and the cover plate have multiple sets of mounting holes corresponding one-to-one with the plurality of locks. Each set of mounting holes includes a lower mounting hole and an upper mounting hole respectively formed on the carrier plate and the cover plate, the lower mounting hole and the upper mounting hole being vertically aligned. Each lock includes a lock cylinder, a pad, and a knob. The lock cylinder includes a cylinder seat, which passes through the corresponding lower mounting hole from bottom to top, and the two are slidably engaged vertically. The upper section of the cylinder seat, extending to the upper surface of the carrier plate, has a first constraint portion circumferentially abutting against the upper surface of the carrier plate. A core rod extending upward and passing through the corresponding upper mounting hole is formed at the center of the upper end face of the core seat. A horizontal locking tongue is formed at the top of the core rod. The pad is fixed to the upper surface of the cover plate at a position corresponding to the upper mounting hole, and has a shaft hole. The knob includes a disc body and a rotating shaft that coincides with the center line of the disc body. The disc body is located on the pad, and its upper surface forms a groove corresponding to the latch. The rotating shaft is fixed to the lower surface of the disc body and is rotatably disposed on the shaft hole. The lower section of the rotating shaft, which passes through the lower surface of the pad, has a second constraint portion in the circumferential direction that abuts against the lower surface of the pad. An elastic self-recovering member is provided between the lower end face of the rotating shaft and the upper end face of the core seat. A central channel is formed on the disc body and the rotating shaft through which the core rod passes, for the latch to pass up and down when the knob is in the first position, and for the latch to engage in the groove when the knob is rotated from the first position to the second position.

[0006] As a second aspect of the present invention, an upper unlocking device for a vehicle capable of synchronous upper unlocking as described in the first aspect is provided, comprising: A conveyor channel for transporting the vehicle to the locked / unlocked position, the conveyor channel comprising a pair of conveyor belts arranged at intervals in the left and right directions and running synchronously; A lifting mechanism, comprising a lifting frame, the upper surface of which has lifting parts corresponding to the plurality of locks, for lifting the vehicle located in the locked / unlocked position from below via the plurality of locks under the drive of the lifting module, and for lifting the lock cylinders of each lock after the vehicle is stopped; The upper unlocking mechanism includes a fixed frame and multiple unlocking claws. The fixed frame has a horizontal mounting plate. The upper surface of the mounting plate is rotatably equipped with multiple tensioning wheels. The lower surface of the mounting plate is equipped with multiple evenly distributed stop portions for stopping the carrier lifted by the lifting mechanism. The number of unlocking claws is the same as the number of locks. Each claw includes a drive shaft and a claw portion. The drive shaft passes vertically through the mounting plate and is rotatably connected to the mounting plate. Its upper end has a transmission wheel. The claw portion is fixed to the lower end of the drive shaft and is used to rotate under the drive of the drive motor, synchronous belt, tensioning wheels, and transmission wheels, so that the corresponding knob rotates between a first position and a second position. The drive motor is fixed to the upper surface of the mounting plate.

[0007] This invention improves the structure of the locks on the carrier. When locking or unlocking, it is not necessary to drive the entire lock cylinder to rotate, but only to drive the knob to rotate. The knob rotation is only subject to friction, and the force on the unlocking claw is small. This low torque transmission characteristic effectively avoids the phenomenon of timing belt skipping, ensuring the reliability and synchronization accuracy of the coordinated action of multiple locks. Therefore, this invention can use a single motor to drive multiple unlocking claws simultaneously through a timing belt to lock or unlock all locks on the carrier synchronously. Compared with the existing technology that requires an independent motor for each lock, this invention significantly reduces the number of driving components, reduces the complexity and hardware cost of the control system, and also reduces the frequency and difficulty of subsequent maintenance. At the same time, it avoids the timing deviation problem that may occur in multi-motor coordinated control, which is conducive to improving the stability and production efficiency of the production line. Attached Figure Description

[0008] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: Figure 1 A schematic diagram of a vehicle capable of synchronous unlocking is provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the lock structure according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the mating structure of the lock, carrier plate, and cover plate according to an embodiment of the present invention; Figure 4 This is a top view of the lock according to an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the lock cylinder according to an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the upper unlocking device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the conveying channel structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the lifting mechanism according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the upper unlocking mechanism according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the unlocking claw in an embodiment of the present invention. Detailed Implementation

[0009] The embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the embodiments described in this specification are not exhaustive and do not represent the only embodiments of the present invention. The corresponding embodiments below are only for clearly illustrating the inventive content of this patent and are not intended to limit its implementation. For those skilled in the art, different variations and modifications can be made based on the embodiments described. Any variations or modifications that fall within the technical concept and inventive content of this invention and are obvious are also within the protection scope of this invention.

[0010] like Figure 1 As shown, this application embodiment provides a carrier that can be unlocked synchronously, including a carrier plate 1100, a cover plate 1200 and eight locks 1300.

[0011] In this embodiment, the carrier is a magnetic carrier. For example, a magnet can be provided on the carrier plate 1100 to magnetically attract the cover plate 1200 to flatten and fix the product (such as a substrate).

[0012] The carrier plate 1100 and the cover plate 1200 have eight sets of mounting holes that correspond one-to-one with the eight locks 1300, and the eight sets of mounting holes are evenly distributed along the edge of the carrier.

[0013] like Figure 3 As shown, each set of mounting holes includes a lower mounting hole 1110 and an upper mounting hole 1210 formed on the carrier plate 1100 and the cover plate 1200, respectively. The lower mounting holes 1110 and the upper mounting holes 1210 in the same set correspond vertically and their center lines coincide.

[0014] like Figure 3 As shown, two guide pins 1111 are evenly arranged around each lower mounting hole 1110, and the upper end of the guide pin 1111 is nailed and fixed to the lower surface of the carrier plate 1100. Of course, the number of guide pins 1111 can also be more than two.

[0015] The carrier plate 1100 and the cover plate 1200 also have a plurality of evenly distributed positioning through holes (not shown in the figure).

[0016] Eight locks, each with a capacity of 1300, are evenly distributed on the vehicle through eight sets of mounting holes.

[0017] like Figure 3 As shown, the lock 1300 includes a lock cylinder 1310, a pad 1320, and a knob 1330.

[0018] like Figure 5 As shown, the lock cylinder 1310 includes a cylinder base 1311, as... Figure 3 As shown, the core seat 1311 passes through the corresponding lower mounting hole 1110 from bottom to top, and the two slide vertically together. The upper section of the core seat 1311 extends to the upper surface of the carrier plate 1100. The circumferential direction of this upper section has a first constraint portion (not shown in the figure) that abuts against the upper surface of the carrier plate 1100, allowing the lock cylinder 1310 to be suspended on the carrier plate 1100 without falling off. Figure 5 As shown, a core rod 1312 is formed at the center of the upper end face of the core seat 1311, extending upward and passing through the corresponding mounting hole 1210. A horizontal locking tongue 1312a is formed at the top of the core rod 1312. The locking tongue 1312a is horizontally block-shaped, and the center of its lower surface is connected to the top of the core rod 1312.

[0019] like Figure 3 and Figure 5 As shown, the bottom of the core base 1311 forms a chassis 1311a, and the chassis 1311a has guide pin holes 1311a-1 that slide up and down with two guide pins 1111 around the corresponding lower mounting hole 1110.

[0020] The pad 1320 is fixed to the upper surface of the cover plate 1200 at the position corresponding to the upper mounting hole 1210 by bolts, and the center line coincides with the center line of the upper mounting hole 1210. See [reference needed]. Figure 3 .

[0021] The pad 1320 has shaft holes in the vertical direction.

[0022] like Figure 3 As shown, the knob 1330 includes a disc body 1331 and a rotating shaft 1332.

[0023] The disk body 1331 is located on the pad 1320, such as Figure 3 and Figure 4 As shown, its upper surface forms a slot 1331a corresponding to the locking tongue 1312a, and the disc body 1331 has two radially protruding ears 1331b at a 180-degree angle in the circumferential direction.

[0024] The centerline of the rotating shaft 1332 coincides with the centerline of the disc body 1331. It is fixed to the lower surface of the disc body 1331 and rotatably disposed in the shaft hole of the pad 1320. The lower section of the rotating shaft 1332 passes through the lower surface of the pad 1320. The lower section has a second constraint portion (not shown in the figure) that abuts against the lower surface of the pad 1320 from the top and bottom, to prevent the knob 1330 from disengaging upward from the pad 1320.

[0025] In this embodiment, as Figure 2 and Figure 3As shown, the upper section of the core base 1311 and the lower section of the rotating shaft 1332 both form snap ring grooves (1311b, 1332a). The first constraint part and the second constraint part both use snap rings, which are provided in the corresponding snap ring grooves. Using snap rings as the first constraint part and the second constraint part facilitates assembly.

[0026] like Figure 2 As shown, an elastic self-recovering member 1340 is provided between the lower end face of the rotating shaft 1332 and the upper end face of the core seat 1311. In this embodiment, the elastic self-recovering member 1340 is a wave spring.

[0027] like Figure 3 As shown, a central channel is formed on the disc body 1331 and the rotating shaft 1332, through which the core rod 1312 passes. This channel is used to allow the locking tongue 1312a to pass up and down when the knob 1330 is in the first position, and to allow the locking tongue 1312a to engage with the slot 1331a when the knob 1330 is rotated from the first position to the second position.

[0028] like Figure 4 As shown, in order to limit the rotation of the knob 1330 between the first position and the second position, the edge of the upper surface of the pad 1320 is provided with a limiting pin 1321, and the disc 1331 has a notch 1331c corresponding to the limiting pin 1321.

[0029] In this embodiment, the vehicle 1 is locked or unlocked by the upper unlocking device, such as... Figure 6 As shown, the upper unlocking device includes a conveying channel 2100, a lifting mechanism 2200, and an upper unlocking mechanism 2300.

[0030] like Figure 7 As shown, the conveying channel 2100 is used to convey the carrier 1 to the locked / unlocked position, and includes a channel body 2110, an alignment unit 2120 and a blocking unit 2130.

[0031] The main body of the flow channel 2110 includes a pair of conveyor belts 2111 arranged at intervals in the left and right directions. The pair of conveyor belts 2111 are set on the bottom plate 2140 of the flow channel by two support plates and can run synchronously by a motor and a drive shaft. This is a conventional technical means and will not be described in detail here.

[0032] Both the alignment unit 2120 and the blocking unit 2130 are mounted on the flow channel base plate 2140. When the carrier 1 is transported to the locked / unlocked position by the conveying flow channel 2100, it is blocked by the blocking unit 2130, and the alignment unit 2120 aligns the carrier 1. The alignment unit 2120 and the blocking unit 2130 are also conventional technical means, and will not be described in detail here.

[0033] like Figure 8 As shown, the lifting mechanism 2200 includes a lifting frame 2210.

[0034] The lifting frame 2210 includes an upper plate 2211, a connecting seat 2212, and a lower plate 2213.

[0035] The upper plate 2211 has multiple waist-shaped holes 2211a in the left and right directions, and the upper surface of the upper plate 2211 has multiple positioning pins 2211b that correspond one-to-one with multiple positioning through holes on the carrier 1, which are used to position the carrier 1 when lifting it.

[0036] The upper plate 2211 also has eight lifting parts 2211c corresponding to the eight locks 1300, which are used to lift the carrier 1 from below through the eight locks 1300 under the drive of the lifting module 2214, and to lift the lock cylinders 1310 of each lock 1300 after the carrier 1 is stopped. In this embodiment, the lifting part 2211c is a hydraulic buffer, and the lifting module 2214 is a cylinder, which is fixed on the flow channel bottom plate 2140.

[0037] The top of the connecting seat 2212 is connected to multiple oblong holes 2211a by multiple bolts. The bottom of the connecting seat 2212 has multiple oblong holes in the front and back directions and is connected to the lower plate 2213 by multiple bolts, so that the left and right position and front and back position of the upper plate 2211 can be adjusted, thereby adjusting the position of the positioning pin 2211b.

[0038] The lower surface of the four corners of the lower plate 2213 is connected to four guide posts 2213a. The four guide posts 2213a are slidably engaged with the flow channel bottom plate 2140 through a linear bearing 2213b, respectively, for guiding during lifting.

[0039] like Figure 9 As shown, the upper unlocking mechanism 2300 includes a fixing frame 2310 and eight unlocking claws 2320.

[0040] The mounting bracket 2310 includes a vertical plate 2311 and a horizontal mounting plate 2312.

[0041] The vertical plate 2311 is used to fix the upper unlocking mechanism 2300. Two symmetrical reinforcing ribs 2313 are connected to the left and right sides of its front side by bolts to enhance the structural strength of the upper unlocking mechanism 2300.

[0042] Mounting plate 2312 is mounted on the underside of two reinforcing ribs 2313 by a flat adjustment screw 2313a. Each reinforcing rib 2313 has a front-to-back position adjustment hole on its underside. The flat adjustment screw 2313a passes through the position adjustment hole and connects to mounting plate 2312, thereby allowing mounting plate 2312 to be adjusted front-to-back so that upper unlocking mechanism 2300 is aligned with conveying channel 2100.

[0043] The upper surface of the mounting plate 2312 is horizontally rotatably provided with multiple tensioning wheels 2314, and the lower surface of the mounting plate has multiple evenly distributed stop portions 2312a for stopping the carrier 1 being lifted by the lifting mechanism 2200. In this embodiment, the stop portion 2312a is a stop rod.

[0044] like Figure 10 As shown, the unlocking claw 2320 includes a drive shaft 2321 and a claw portion 2322.

[0045] The drive shaft 2321 passes vertically through the mounting plate 2312 and is rotatably connected to the mounting plate 2312 via a bearing. Its upper end has a transmission wheel 2321a.

[0046] The claw portion 2322 includes a connecting plate 2322a and two unlocking pins 2322b. The center of the connecting plate 2322a is connected to the lower end of the drive shaft 2321. The two unlocking pins 2322b are fixed to the lower surface of the connecting plate 2322a. Driven by the drive motor 2330, the synchronous belt 2340, multiple tensioning pulleys 2314 and the transmission pulley 2321a, the drive shaft 2321 can rotate, and the two unlocking pins 2322b are driven to rotate circumferentially via the connecting plate 2322. This causes the two unlocking pins 2322b to push the two ears 1331b respectively, thereby driving the knob 1330 to rotate between the first position and the second position.

[0047] The drive motor 2330 is fixed to the upper surface of the mounting plate 2312. In this embodiment, the first position and the second position are 90 degrees apart.

[0048] The working process of the upper unlocking device is as follows: 1. The carrier 1 is transported to the locked / unlocked position by the conveyor channel 2100.

[0049] 2. The eight lifting parts 2211c of the lifting mechanism 2200 respectively support the eight locks 1300 to lift the carrier 1 in the locked / unlocked position. When the carrier 1 is stopped by the stop part 2312a of the upper unlocking mechanism 2300, the lifting mechanism 2200 does not stop and continues to lift, so that the lock cylinders 1310 of the eight locks 1300 are lifted. The bolts 1312a of each lock cylinder 1310 are lifted from the central channel to above the knob 1330. At the same time, the elastic self-recovering member 1340 of each lock 1300 is compressed.

[0050] 3. The upper unlocking mechanism 2300 drives the knob 1330 to rotate 90 degrees from the first position to the second position. At the same time, the lifting mechanism 2200 returns to its original position, so that the locking tongue 1312a is precisely engaged in the slot 1331a of the knob 1330, thereby locking the vehicle 1.

[0051] 4. When unlocking is required, repeat the actions of steps 1-3 above. When the bolt 1312a of each lock cylinder 1310 is higher than the knob 1330, rotate the knob 1330 90 degrees from the second position to the first position. At this time, the lifting mechanism 2200 returns to its original position. Under the action of the elastic self-resetting member 1340, the bolt 1312a returns to the central channel, thereby unlocking the carrier 1.

[0052] Therefore, this invention improves the structure of the locks on the carrier. When locking or unlocking, it is not necessary to drive the entire lock cylinder to rotate, but only to drive the knob to rotate. The knob rotation is only subject to frictional force, and the unlocking claw is subjected to less force. This low torque transmission characteristic effectively avoids the phenomenon of timing belt skipping, ensuring the reliability and synchronization accuracy of the coordinated action of multiple locks. Therefore, this invention can use a single motor to drive multiple unlocking claws simultaneously through a timing belt to lock or unlock all locks on the carrier synchronously. Compared with the existing technology that requires an independent motor for each lock, this invention significantly reduces the number of driving components, reduces the complexity and hardware cost of the control system, and also reduces the frequency and difficulty of subsequent maintenance. At the same time, it avoids the timing deviation problem that may occur in multi-motor coordinated control, which is conducive to improving the stability and production efficiency of the production line.

[0053] Furthermore, this invention locks the carrier using both magnetic attraction and locking mechanisms. Even when the carrier's magnetism diminishes after prolonged exposure to the reflow oven, the locking mechanism can still ensure the product's stability and positional accuracy.

[0054] Furthermore, in traditional solutions, each lock requires an independent drive motor to perform locking or unlocking operations. Considering space constraints, this limits the number of motors that can be installed, thus significantly restricting the number of locks on the carrier. For example, the solution disclosed in Chinese Patent Publication No. CN212665363U only allows locks to be placed at the four corners of the carrier. However, this application requires only a single motor to drive all locks, thus significantly increasing the number of locks on the carrier, for example, to eight. This increased number of locks results in a more even distribution of locking force on the carrier, allowing for more stable product pressing and effectively reducing the risk of warping or displacement due to uneven localized stress during high-temperature processing. This improves processing quality and yield.

[0055] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A carrier capable of simultaneous unlocking and closing, comprising a carrier plate and a cover plate, and having a plurality of evenly distributed locks thereon, characterized in that, The carrier plate and cover plate have multiple sets of mounting holes corresponding one-to-one with the plurality of locks. Each set of mounting holes includes a lower mounting hole and an upper mounting hole formed on the carrier plate and cover plate respectively. The lower mounting hole and the upper mounting hole are vertically aligned. The lock includes a lock cylinder, a pad, and a knob. The lock cylinder includes a cylinder seat, which passes through the corresponding lower mounting hole from bottom to top and the two are slidably engaged. The upper section of the cylinder seat, which extends to the upper surface of the carrier plate, has a first constraint portion in the circumferential direction that abuts against the upper surface of the carrier plate. A core rod is formed at the center of the upper end face of the core seat, extending upward and passing through the corresponding upper mounting hole. The top of the core rod forms a horizontal lock tongue. The pad is fixed to the upper surface of the cover plate at the position corresponding to the upper mounting hole. The knob has a shaft hole and includes a disc body and a rotating shaft that coincides with the center line of the disc body. The disc body is located on the pad and its upper surface forms a groove corresponding to the latch. The rotating shaft is fixed to the lower surface of the disc body and is rotatably disposed on the shaft hole. The lower section of the rotating shaft, which passes through the lower surface of the pad, has a second constraint portion in the circumferential direction that abuts against the lower surface of the pad. An elastic self-recovering member is provided between the lower end face of the rotating shaft and the upper end face of the core seat. A central channel is formed on the disc body and the rotating shaft through which the core rod passes, for the latch to pass up and down when the knob is in the first position and for the latch to engage in the groove when the knob is rotated from the first position to the second position.

2. A vehicle capable of synchronous unlocking according to claim 1, characterized in that, At least two guide pins are evenly arranged around each mounting hole. The upper end of the guide pin is fixed to the lower surface of the carrier plate. The bottom of the core seat forms a chassis. The chassis has guide pin holes that slide up and down with the corresponding at least two guide pins.

3. A vehicle capable of synchronous unlocking according to claim 1, characterized in that, The upper section of the core seat and the lower section of the rotating shaft both form snap ring grooves in the circumferential direction. The first constraint part and the second constraint part both use snap rings, and the snap rings are disposed in the corresponding snap ring grooves.

4. A vehicle capable of synchronous unlocking according to claim 1, characterized in that, The latch is in the shape of a horizontal block, and the center of its lower surface is connected to the top of the core rod.

5. A vehicle capable of synchronous unlocking according to claim 1, characterized in that, The elastic self-recovering component is a wave spring.

6. A vehicle capable of synchronous unlocking according to claim 1, characterized in that, The upper surface of the pad is provided with a limiting pin, and the disc has a notch corresponding to the limiting pin, which is used to limit the rotation of the knob between the first position and the second position.

7. An upper unlocking device for a vehicle according to any one of claims 1-6, characterized in that, include: A conveyor channel for transporting the vehicle to the locked / unlocked position, the conveyor channel comprising a pair of conveyor belts arranged at intervals in the left and right directions and running synchronously; A lifting mechanism, comprising a lifting frame, the upper surface of which has lifting parts corresponding to the plurality of locks, for lifting the vehicle located in the locked / unlocked position from below via the plurality of locks under the drive of the lifting module, and for lifting the lock cylinders of each lock after the vehicle is stopped; The upper unlocking mechanism includes a fixed frame and multiple unlocking claws. The fixed frame has a horizontal mounting plate. The upper surface of the mounting plate is rotatably equipped with multiple tensioning wheels. The lower surface of the mounting plate is equipped with multiple evenly distributed stop portions for stopping the carrier lifted by the lifting mechanism. The number of unlocking claws is the same as the number of locks. Each claw includes a drive shaft and a claw portion. The drive shaft passes vertically through the mounting plate and is rotatably connected to the mounting plate. Its upper end has a transmission wheel. The claw portion is fixed to the lower end of the drive shaft and is used to rotate under the drive of the drive motor, synchronous belt, tensioning wheels, and transmission wheels, so that the corresponding knob rotates between a first position and a second position. The drive motor is fixed to the upper surface of the mounting plate.

8. The upper unlocking device according to claim 7, characterized in that, The knob has two radially protruding ears at a 180-degree angle on its circumference. The claw includes a connecting plate and two unlocking pins. The center of the connecting plate is connected to the lower end of the drive shaft. The two unlocking pins are fixed to the lower surface of the connecting plate and are used to push the two ears to rotate the knob when the connecting plate rotates with the drive shaft.

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