Cap screwing device applied to small gas storage bottle

Abstract

The invention relates to a cap screwing device applied to a small gas storage bottle. The cap screwing device comprises a fixing frame and a cap screwing assembly. The fixing frame comprises a top plate, a fixing plate and a bottom plate. The cap screwing assembly comprises a lifting mechanism and a grabbing mechanism. The grabbing mechanism comprises a servo motor, a motor base plate, a connecting shaft, a grabbing air cylinder, a lower pressing plate, a vertical spring, a lower pressing cylinder, a paw, an elastic belt and a sleeve. The motor base plate is connected with the bottom plate through a vertical spring; the output end of the servo motor faces downwards and is connected with the connecting shaft; the grabbing air cylinder is connected with the motor base plate and the lower pressing plate. The outer wall of the pressing cylinder is big-end-up; the upper ends of the paws abut against the outer wall of the lower pressing cylinder, and the middles are hinged to the lower ends of the connecting shafts; the elastic band is connected with the upper end of the paw; the sleeve is embedded in the lower end face of the connecting shaft. The fixing frame provides enough space; flexible connection between the servo motor and the fixing frame is achieved through the vertical spring, buffering is carried out when the lifting mechanism excessively descends, the servo motor stably descends along with the screwing-in depth of the valve, and the connecting quality of the valve and the gas storage bottle is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of capping machines, in particular to a capping device applied to small gas storage bottles. Background Art

[0002] A capping machine is a device that screws a bottle cap onto the mouth of a bottle. A gas cylinder is a bottle that stores high-pressure gas or liquefied gas; the inside of a gas cylinder is a high-pressure environment, and a sealing gasket is used to seal the threaded connection between the bottle body and the valve. The appearance of a small gas cylinder is similar to that of an ordinary bottle, and the size and connection structure are similar; a capping machine has the possibility of screwing valves on a small gas cylinder; conventional capping machines cannot be used to screw valves on small gas cylinders. However, the capping devices used in conventional capping machines are mostly rigid structures, which ensure a stable output torque to drive the bottle cap to rotate, and then rely on the gravity of the bottle cap to complete the capping operation. However, for valves, the resistance to screwing in of the valve is much greater than that of ordinary bottle caps; and if an external force such as a cylinder or an electric push rod is used to force the valve, it is easy to cause the threaded connection structure between the valve and the mouth of the bottle to be damaged, and the sealing effect is lost. Therefore, the existing capping machine lacks a capping device suitable for small gas cylinders. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a screw capping device for small gas storage bottles.

[0004] The technical scheme of the present invention is as follows: a capping device applied to a small gas storage cylinder comprises a three-layer fixing frame of an upper and a lower layer, and a capping assembly arranged inside the fixing frame; the fixing frame comprises a top plate, a fixing plate, and a bottom plate which are fixedly connected to each other from top to bottom, so as to provide sufficient space for the capping assembly to work; wherein the fixing plate is used to connect with the capping machine; the capping assembly comprises a lifting mechanism and a grasping mechanism; the lifting mechanism comprises a lifting plate, a lifting cylinder, and a lead rod; the upper end of the lifting cylinder is connected with the top plate, and the lower end is connected with the lifting plate; the lead rod is vertically arranged, the lower end is fixedly connected with the lifting plate, and the upper end passes through the bottom plate, the fixing plate, and the top plate in sequence; the lifting cylinder extends outward, and the lifting plate descends; the lifting cylinder retracts inward, and the lifting plate rises; the lead rod provides guidance for the lifting and lowering of the lifting plate; the grasping mechanism comprises a servo motor, a motor base plate, a connecting shaft, a grasping cylinder, a lower pressure plate, a vertical spring, a lower pressure cylinder, a hand claw, an elastic belt, and a sleeve; the four corners of the motor base plate are connected with the base plate through vertical springs to achieve flexible connection; the servo motor is mounted on the motor base plate The center position, the output end is connected to the connecting shaft downward; the torque output by the servo motor is transmitted through the connecting shaft; the grabbing cylinder is vertically arranged, the upper end is connected to the motor base plate, and the lower end is connected to the lower pressure plate; the grabbing cylinder extends outward, the lower pressure plate is lowered; the grabbing cylinder retracts inward, and the lower pressure plate rises; the connecting shaft passes through the motor base plate, the lower pressure plate, and the lower pressure cylinder in sequence; the outer wall of the lower pressure cylinder is larger at the top and smaller at the bottom; the lower end of the outer wall of the lower pressure cylinder has a certain slope surface; the claws are symmetrically arranged on both sides of the lower end of the connecting shaft, and the upper end is connected to the outer wall of the lower pressure cylinder The middle part is hinged with the lower end of the connecting shaft, and the lower end exceeds the lower end surface of the connecting shaft; the lower pressure plate descends, bringing the lower pressure cylinder down; the lower pressure cylinder acts on the upper end of the claw, so that the lower end of the claw is retracted inward to achieve the grasping action; the elastic belt is symmetrically arranged on both sides of the lower pressure cylinder, connecting the upper end of the claw; the lower pressure plate rises; the elastic belt pulls the upper end of the claw to make the lower end of the claw open outward; at the same time, the upper end of the claw will also pressurize the lower pressure cylinder to rise; the sleeve is embedded in the lower end surface of the connecting shaft; the sleeve applies the torque transmitted by the connecting shaft to the valve.

[0005] Furthermore, the screw capping device applied to small gas cylinders also includes a height-adjusting frame; the height-adjusting frame includes a door-shaped frame body, a screw whose bottom end is rotatably connected to the top of the frame body, and a connecting plate that cooperates with the thread in the middle of the screw body; by rotating the upper end of the screw body, the frame body can be driven to rise and fall, thereby adjusting the height of the fixed frame; the height of the entire screw capping device can be adjusted according to the height of the gas cylinder; the upper end of the screw body is a square end, which is convenient for rotating the upper end of the screw body.

[0006] Preferably, the lifting cylinder and the grabbing cylinder are symmetrically arranged on both sides of the servo motor, so that uniform force is applied to ensure the lifting stability of the lifting mechanism and the grabbing stability of the grabbing cylinder.

[0007] Preferably, the screw capping device used for small gas storage cylinders also includes an adjusting mechanism; the adjusting mechanism includes an adjusting barrel and an adjusting screw that are threadedly matched with each other; the adjusting barrel is connected to the telescopic end of the lifting cylinder and the telescopic end of the grabbing cylinder; the adjusting screw is connected to the top plate and the lower pressure plate; adjusting the thread length of the adjusting sleeve and the adjusting screw can control the stroke of the lifting cylinder and the grabbing cylinder.

[0008] Preferably, the grabbing mechanism also includes a stroke control plate arranged above the motor seat plate; the stroke control plate is evenly distributed with a number of downward stroke control screws; the stroke control screws are threadedly matched with the stroke control plate; the lower end height of the stroke control screw is adjustable, which can control the upper limit position of the motor seat plate, thereby improving the lifting stability of the lifting mechanism.

[0009] Furthermore, the gripping mechanism also includes a guide shaft; the upper end of the guide shaft is connected to the travel control plate, the lower end is connected to the lifting plate, and the middle part passes through the vertical spring; the guide shaft provides guidance for the vertical spring to ensure stable operation of the vertical spring.

[0010] Preferably, the grasping mechanism also includes an articulated clamp and a reset spring; the middle part of the articulated clamp is sleeved outside the connecting shaft; both ends of the articulated clamp are provided with clamping plates hinged to the middle part of the claw; the top and bottom of the articulated clamp are provided with retaining springs installed on the connecting shaft; the articulated clamp and the connecting shaft are detachably connected to each other for easy maintenance and replacement; the reset spring is sleeved outside the connecting shaft, the lower end is connected to the articulated clamp, and the upper end is connected to the lower pressure cylinder; the reset spring enhances the recovery force of the lower pressure cylinder.

[0011] Furthermore, a large disc sleeved outside the connecting shaft is provided between the lower pressing plate and the lower pressing cylinder, so that the lower pressing cylinder is stably stressed, ensuring that the lower pressing plate acts stably on the lower pressing cylinder when pressing downward.

[0012] The beneficial effects of the present invention are as follows: the capping device applied to a small gas storage bottle of the present invention has the following advantages: (1) The fixing frame of the present invention provides sufficient space for the movement of the lifting mechanism and the grabbing mechanism; the vertical spring in the grabbing mechanism realizes the flexible connection between the servo motor and the fixing frame, and provides buffering when the lifting mechanism drops excessively, so that the servo motor can gradually and steadily drop with the screw-in depth of the valve, thereby ensuring the connection quality between the valve and the gas cylinder; (2) The height-adjustable frame of the present invention can drive the frame body to rise and fall, thereby adjusting the height of the fixed frame; the height of the entire screw-capping device can be adjusted according to the height of the gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of the capping device of the present invention applied to a small gas storage bottle; Figure 2 It is a three-dimensional diagram of the fixed frame and the height-adjustable frame; Figure 3 is a stereogram of the screw cap assembly; Figure 4 yes Figure 3 The main view; Figure 5 yes Figure 4 AA section view; Figure 6 yes Figure 5 BB cross-sectional view; In the figure: 1. fixed frame, 11. top plate, 12. fixed plate, 13. bottom plate, 2. screw cap assembly, 211. lifting plate, 212. lifting cylinder, 213. lead rod, 2211. servo motor, 2212. motor base plate, 22121. frame, 222. connecting shaft, 2221. retaining spring, 2222. large disc, 2231. grabbing cylinder, 2232. lower pressure plate, 224. vertical spring, 2251. lower Pressure cylinder, 22511. Vertical long hole, 22512. Stroke screw, 2252. Hand claw, 2253. Elastic belt, 2254. Sleeve, 2261. Stroke control plate, 2262. Stroke control screw, 227. Guide shaft, 2281. Articulated clamp, 2282. Return spring, 3. Height adjustment frame, 31. Frame, 32. Screw, 321. Square end, 33. Connecting plate, 41. Adjusting screw barrel, 42. Adjusting screw. Implementation

[0014] Example 1: See Figure 1-6A capping device for small gas cylinders includes a three-layer fixing frame 1, a capping assembly 2 arranged inside the fixing frame 1; the fixing frame 1 includes a top plate 11, a fixing plate 12, and a bottom plate 13 which are fixedly connected to each other from top to bottom, providing sufficient space for the capping assembly 2 to work; wherein the fixing plate 12 is used to connect with the capping machine; the capping assembly 2 includes a lifting mechanism and a grasping mechanism; the lifting mechanism includes a lifting plate 211, a lifting cylinder 212, and a lead rod 213; the upper end of the lifting cylinder 212 is connected to the top plate 11, and the lower end is connected to the lifting plate 211; the lead rod 213 is vertically arranged, the lower end is fixedly connected to the lifting plate 211, and the upper end passes through the bottom plate 13, the fixing plate 12, the top plate in sequence 11; the lifting cylinder 212 extends outward, and the lifting plate 211 descends; the lifting cylinder 212 retracts inward, and the lifting plate 211 rises; the lead rod 213 provides guidance for the lifting and lowering of the lifting plate 211; the grabbing mechanism includes a servo motor 2211, a motor base plate 2212, a connecting shaft 222, a grabbing cylinder 2231, a lower pressing plate 2232, a vertical spring 224, a lower pressing cylinder 2251, a hand claw 2252, an elastic band 2253, and a sleeve 2254; the four corners of the motor base plate 2212 are connected to the bottom plate 13 through the vertical spring 224 to achieve a flexible connection; the servo motor 2211 is installed at the center of the motor base plate 2212, and the output end is connected to the connecting shaft 222 downward; The torque output by the servo motor 2211 is transmitted through the connecting shaft 222; the grabbing cylinder 2231 is arranged vertically, the upper end is connected to the motor base plate 2212, and the lower end is connected to the lower pressure plate 2232; the grabbing cylinder 2231 extends outward, and the lower pressure plate 2232 is lowered; the grabbing cylinder 2231 retracts inward, and the lower pressure plate 2232 rises; the connecting shaft 222 passes through the motor base plate 2212, the lower pressure plate 2232, and the lower pressure cylinder 2251 in sequence; the outer wall of the lower pressure cylinder 2251 is larger at the top and smaller at the bottom; the lower end of the outer wall of the lower pressure cylinder 2251 has a certain slope surface; the claws 2252 are symmetrically arranged on both sides of the lower end of the connecting shaft 222, the upper end is against the outer wall of the lower pressure cylinder 2251, and the middle part is against the lower end of the connecting shaft 222 The two ends are hinged, and the lower end exceeds the lower end surface of the connecting shaft 222; the lower pressure plate 2232 descends, bringing the lower pressure cylinder 2251 down; the lower pressure cylinder 2251 acts on the upper end of the hand claw 2252, so that the lower end of the hand claw 2252 is retracted inward to achieve the grasping action; the elastic band 2253 is symmetrically arranged on both sides of the lower pressure cylinder 2251, connecting the upper end of the hand claw 2252; the lower pressure plate 2232 rises, and the elastic band 2253 pulls the upper end of the hand claw 2252, so that the lower end of the hand claw 2252 opens outward; at the same time, the upper end of the hand claw 2252 will also pressurize the lower pressure cylinder 2251 to rise; the sleeve 2254 is embedded in the lower end surface of the connecting shaft 222; the sleeve 2254 applies the torque transmitted by the connecting shaft 222 to the valve.

[0015] Compared with the prior art, the present invention provides sufficient space for the actions of the lifting mechanism and the grasping mechanism through the three-layer fixed frame 1; the vertical spring 224 in the grasping mechanism realizes the flexible connection between the servo motor 2211 and the fixed frame 1, and performs buffering when the lifting mechanism descends excessively, so that the servo motor 2211 can gradually and steadily descend with the screw-in depth of the valve, thereby ensuring the connection quality of the valve and the gas cylinder.

[0016] The screw capping device applied to small gas cylinders also includes a height-adjusting frame 3; the height-adjusting frame 3 includes a door-shaped frame body 31, a screw 32 whose bottom end is rotatably connected to the top of the frame body 31, and a connecting plate 33 that cooperates with the middle thread of the screw 32; by rotating the upper end of the screw 32, the frame body 31 can be driven to rise and fall, thereby adjusting the height of the fixed frame 1; the height of the entire screw capping device can be adjusted according to the height of the gas cylinder; the upper end of the screw 32 is a square end 321, which is convenient for rotating the upper end of the screw 32.

[0017] The lifting cylinder 212 and the grabbing cylinder 2231 are symmetrically arranged on both sides of the servo motor 2211 , so that uniform force is applied to ensure the lifting stability of the lifting mechanism and the grabbing stability of the grabbing cylinder 2231 .

[0018] The screw capping device used for small gas cylinders also includes an adjusting mechanism; the adjusting mechanism includes an adjusting screw barrel 41 and an adjusting screw rod 42 that are threadedly matched with each other; the adjusting screw barrel 41 is connected to the telescopic end of the lifting cylinder 212 and the telescopic end of the grabbing cylinder 2231; the adjusting screw rod 42 is connected to the top plate 11 and the lower pressure plate 2232; adjusting the thread length of the adjusting sleeve 2254 and the adjusting screw rod 42 can control the stroke of the lifting cylinder 212 and the grabbing cylinder 2231.

[0019] The grabbing mechanism also includes a stroke control plate 2261 arranged above the motor seat plate 2212; the stroke control plate 2261 is evenly distributed with a number of downward stroke control screws 2262; the stroke control screws 2262 are threadedly matched with the stroke control plate 2261; the lower end height of the stroke control screw 2262 is adjustable, which can control the upper limit position of the motor seat plate 2212, thereby improving the lifting stability of the lifting mechanism.

[0020] A cross-shaped frame 22121 is provided on the motor base plate 2212; the grabbing cylinder 2231 is installed on the cross-shaped frame 22121, and the structure is more compact.

[0021] The gripping mechanism also includes a guide shaft 227; the upper end of the guide shaft 227 is connected to the travel control plate 2261, the lower end is connected to the lifting plate 211, and the middle part passes through the vertical spring 224; the guide shaft 227 provides guidance for the vertical spring 224 to ensure that the vertical spring 224 works stably.

[0022] The gripping mechanism also includes an articulated clamp 2281 and a return spring 2282; the middle part of the articulated clamp 2281 is sleeved outside the connecting shaft 222; both ends of the articulated clamp 2281 are provided with clamping plates hinged to the middle part of the claw 2252; the top and bottom of the articulated clamp 2281 are provided with retaining springs 2221 installed on the connecting shaft 222; the articulated clamp 2281 and the connecting shaft 222 are detachably connected to each other, which is convenient for maintenance and replacement; the return spring 2282 is sleeved outside the connecting shaft 222, the lower end of which is connected to the articulated clamp 2281, and the upper end is connected to the lower pressure cylinder 2251; the return spring 2282 enhances the rebound force of the lower pressure cylinder 2251.

[0023] The working principle of this embodiment is as follows: the lifting cylinder 212 extends outward, and the lifting plate 211 descends; the lifting cylinder 212 retracts inward, and the lifting plate 211 rises; the lead rod 213 provides guidance for the lifting and lowering of the lifting plate 211; the lifting and lowering of the lifting plate 211 can cooperate with the screw cap device to grasp the valve and screw the valve; when the lifting plate 211 descends, the vertical spring 224 can provide a certain amount of buffering to prevent the valve and the gas cylinder from being damaged; the torque output by the servo motor 2211 is transmitted through the The connecting shaft 222 transmits; the grabbing cylinder 2231 extends outward, and the lower pressing plate 2232 is lowered; the grabbing cylinder 2231 retracts inward, and the lower pressing plate 2232 rises; the grabbing cylinder 2231 extends outward, and the lower pressing plate 2232 is lowered; the grabbing cylinder 2231 retracts inward, and the lower pressing plate 2232 rises; the lower pressing plate 2232 rises, and the elastic band 2253 pulls the upper end of the claw 2252, so that the lower end of the claw 2252 opens outward; at the same time, the upper end of the claw 2252 also presses the lower pressing cylinder 2251 to rise. The sleeve 2254 applies the torque transmitted by the connecting shaft 222 to the valve.

[0024] Embodiment 2: Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The difference is that a large disc 2222 is provided between the lower pressure plate 2232 and the lower pressure cylinder 2251 and is sleeved outside the connecting shaft 222, so that the lower pressure cylinder 2251 is stably stressed, ensuring that the lower pressure plate 2232 stably acts on the lower pressure cylinder 2251 when pressed downward.

[0025] A vertical long hole 22511 and a stroke screw 22512 are provided on the outer wall of the pressure cylinder 2251; the stroke screw 22512 passes through the vertical long hole 22511 and is threadedly connected to the connecting shaft 222; the length of the vertical long hole 22511 is the stroke length of the lowering and lowering of the pressure cylinder 2251; the stroke screw 22512 limits the horizontal rotation of the pressure cylinder 2251, thereby improving the stability of the pressure cylinder 2251 when being pressed downward; the vertical long hole 22511 cooperates with the stroke screw 22512 to provide guidance for the lowering of the pressure cylinder 2251.

Claims

1. A capping device for a small gas storage bottle, characterized in that: It includes a three-layer fixing frame, a capping assembly arranged inside the fixing frame; the fixing frame includes a top plate, a fixing plate, and a bottom plate fixedly connected to each other from top to bottom; the capping assembly includes a lifting mechanism and a grabbing mechanism; the lifting mechanism includes a lifting plate, a lifting cylinder, and a guide rod; the upper end of the lifting cylinder is connected to the top plate, and the lower end is connected to the lifting plate; the guide rod is vertically arranged, the lower end is fixedly connected to the lifting plate, and the upper end passes through the bottom plate, the fixing plate, and the top plate in sequence; the grabbing mechanism includes a servo motor, a motor seat plate, a connecting shaft, a grabbing cylinder, a lower pressure plate, a vertical spring, a lower pressure cylinder, a hand claw, an elastic belt, and a sleeve The four corners of the motor base plate are connected to the bottom plate through vertical springs; the servo motor is installed in the center of the motor base plate, and the output end is connected to the connecting shaft downward; the grabbing cylinder is arranged vertically, the upper end is connected to the motor base plate, and the lower end is connected to the lower pressure plate; the connecting shaft passes through the motor base plate, the lower pressure plate, and the lower pressure cylinder in sequence; the outer wall of the lower pressure cylinder is larger at the top and smaller at the bottom; the claws are symmetrically arranged on both sides of the lower end of the connecting shaft, the upper end is against the outer wall of the lower pressure cylinder, the middle part is hinged to the lower end of the connecting shaft, and the lower end exceeds the lower end surface of the connecting shaft; the elastic belts are symmetrically arranged on both sides of the lower pressure cylinder, connecting the upper end of the claws; the sleeve is embedded in the lower end surface of the connecting shaft.

2. The capping device for small gas cylinders according to claim 1 is characterized in that: It also includes a height-adjusting frame; the height-adjusting frame includes a door-shaped frame body, a lead screw whose bottom end is rotatably connected to the top of the frame body, and a connecting plate that cooperates with the thread in the middle of the lead screw; the upper end of the lead screw is a square end.

3. The capping device for small gas cylinders according to claim 1 is characterized in that: The lifting cylinder and the grabbing cylinder are symmetrically arranged on both sides of the servo motor.

4. The capping device for small gas cylinders according to claim 1 is characterized in that: It also includes an adjusting mechanism; the adjusting mechanism includes an adjusting screw barrel and an adjusting screw rod that are threadedly matched with each other; the adjusting screw barrel is connected to the telescopic end of the lifting cylinder and the telescopic end of the grabbing cylinder; the adjusting screw rod is connected to the top plate and the lower pressure plate.

5. The capping device for small gas cylinders according to claim 1 is characterized in that: The grabbing mechanism also includes a travel control plate arranged above the motor seat plate; the travel control plate is evenly distributed with a number of downward travel control screws; the travel control screws are threadedly matched with the travel control plate.

6. The screw capping device for small gas cylinders according to claim 5, characterized in that: The grabbing mechanism also includes a guide shaft; the upper end of the guide shaft is connected to the stroke control plate, the lower end is connected to the lifting plate, and the middle part passes through the vertical spring.

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