An automatic screw-in device for sealing high-torque containers

Abstract

This invention relates to an automatic screw-in device for sealing high-torque containers, belonging to the field of assembly automation technology. The device has a fixed sleeve containing a primary moving sleeve forming a vertical moving pair; the upper end of the primary moving sleeve is connected to the telescopic end of a cylinder, and the lower end is fitted with a secondary sleeve fixed thereto and a telescopic shaft forming a vertical moving pair. The telescopic shaft is located within the secondary sleeve and tends to press downwards; the lower end of the telescopic shaft is fitted with a rotatable clamping shaft, and the lower end of the secondary sleeve is fitted with a spring-loaded jaw forming a vertical moving pair and fixed to a limiting fixture adapted to a threaded screw; the spring-loaded jaw tends to press downwards and supports the screw from the inside out; a rotatable outer casing fixture is placed below the limiting fixture, and the outer casing fixture holds the container outer shell with an internally threaded opening. Using this invention ensures reliable sealing of easily expandable substances inside the container after being sealed by the cap, resulting in high efficiency and stable quality.

Description

Technical Field

[0001] This invention relates to an assembly device for torque connection, and more particularly to an automatic screw-in device for sealing the screw ring of a high-torque container, belonging to the field of assembly automation technology. Background Technology

[0002] For a long time, the assembly of some high-torque connecting parts has always relied on manual labor. Although special tooling is used for operation, it is still inefficient, labor-intensive, and the assembly quality is difficult to guarantee.

[0003] The applicant encountered a situation where a container holding a special easily expandable substance needed to be sealed by inserting a screw into the internal thread on the upper part of the container while it was under pressure. A search revealed that Chinese patent document application number 202111416401.1 discloses an automatic assembly equipment and method for large threads, including a turntable device and a glue-applying and tightening device. The turntable device includes a turntable with multiple stations and a turntable drive mechanism. The turntable has multiple stations, including an external thread feeding station, a glue-applying and tightening station, and a finished product unloading station. The glue-applying and tightening device is located on one side of the glue-applying and tightening station and is used to tighten the external thread and the internal thread base. In the pre-assembly and thread-recognition process, a displacement sensor monitors the chuck displacement, and the pre-tightening force of a compression spring completes the pre-assembly and thread-recognition, ensuring that the starting point of each external thread screwing into the internal thread base is the same, thereby ensuring that the depth of the external thread screwing into the internal thread base is consistent in each assembly. In addition, Chinese patent document application number 201922354282.6 discloses a press-fitting and tightening integrated device. An electric cylinder is fixed to the upper end of the bracket with bolts. The lower end of the output shaft of the electric cylinder is connected to the lower pressure rod through a pressure sensor and a connecting block. The lower pressure rod passes through all the rotation torque devices and is fitted with a hollow rotating rod on the outside. The lower end of the rotating rod has a spline on the outside. The electric cylinder is fixed on the bracket and has a built-in servo motor. A reducer and a torque sensor are fitted on the outside of the pressure rod below the electric cylinder. The servo motor is connected to the upper side of the reducer. Both the electric cylinder and the servo motor are controlled by a PLC.

[0004] Although the aforementioned existing technology has achieved automated screw-on assembly, its automatic tightening of internal and external threads is only designed with one level of extension, that is, the external thread screws into the internal thread, which cannot meet the technical requirements of the applicant to press the cap into place. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an automatic screw-in device for sealing high-torque containers, which can not only automate screw-in but also screw the cap into the container while the cap is pressed, thus ensuring that the cap is reliably and automatically sealed.

[0006] To achieve the above objectives, the basic technical solution of the automatic screw-in device for high-torque container screw sealing of the present invention is as follows:

[0007] It includes a vertically fixed sleeve with a cylinder mounted at the upper end, and a primary movable sleeve that forms a vertical moving pair with the fixed sleeve is installed inside the fixed sleeve.

[0008] The upper end of the primary movable sleeve is connected to the telescopic end of the cylinder, and the lower end is equipped with a secondary sleeve fixed thereto and a telescopic shaft forming a vertical moving pair with it. The telescopic shaft is located in the secondary sleeve and tends to be pressed downward.

[0009] The lower end of the telescopic shaft is equipped with a rotatable clamping shaft, and the lower end of the secondary sleeve is equipped with a spring plate claw that forms a vertical moving pair with it and is fixedly connected to a limiting fixture that is adapted to a threaded ring with external threads; the spring plate claw tends to press down and is supported inside the threaded ring from the inside out.

[0010] A rotatable outer shell fixture is placed below the limiting fixture, and the outer shell fixture holds a container shell with an internal thread.

[0011] During packaging, the pressure screw is placed under the screw ring limiting fixture and its inner ring is held in place by spring-loaded jaws. The cap is placed in a container that already contains an easily expandable substance. The actuating cylinder pushes the primary moving sleeve downwards. Before the clamping shaft contacts the cap, it drives the connecting shaft, secondary sleeve 8, and telescopic shaft to descend together with the clamping shaft. When the clamping shaft touches the upper surface of the cap, the cylinder continues to push the clamping shaft downwards to press the cap, while the primary and secondary sleeves, along with the pressure screw, continue to descend until the pressure screw contacts the inner thread of the container shell. Then, the shell fixture is driven to rotate the container shell together, and the pressure screw is screwed into the inner thread of the container shell due to the relative rotation. At this time, the cylinder continues to advance downwards, and the screw ring limiting fixture continues to push the pressure screw downwards. During the continued screwing process, the spring-loaded jaws gradually disengage from the inner ring of the pressure screw and retract into the secondary sleeve until the pressure screw reaches the required position to press the cap, at which point the spring-loaded jaws completely disengage from the pressure screw. During the above process, the clamping shaft can rotate with the pressure cap, and the concave spline structure at its lower end keeps pressing down on the pressure cap.

[0012] Therefore, by adopting this invention, the entire operation of inserting the screw into the container until the screw presses down on the cap can be completed automatically while keeping the cap pressed. This ensures that the easily expandable material in the container is reliably held in place by the cap and sealed, resulting in high efficiency and stable quality.

[0013] Further improvements to this invention include:

[0014] The outer circumference of the primary movable sleeve has an axial guide groove, and the side wall of the fixed sleeve is equipped with a guide screw whose end matches the axial guide groove.

[0015] The lower end of the primary movable sleeve is fixedly connected to a connecting bushing, and a telescopic shaft with an axial groove on its outer circle is inserted into the connecting bushing. The side wall of the connecting bushing is equipped with a guide pin whose end matches the axial groove.

[0016] A fixed spring baffle is installed in the primary movable sleeve, and a small spring is installed between the spring baffle and the upper guide hole of the telescopic shaft to make the telescopic shaft 7 tend to be pressed down.

[0017] The lower end hole of the telescopic shaft is fitted with a rotatable clamping shaft supported by a bearing.

[0018] The lower end of the secondary sleeve is fitted with a spring clip that is adapted to it. The lower end of the secondary sleeve has an axially extending waist-shaped hole, which is slidably engaged with a sliding screw mounted on the side wall of the spring clip.

[0019] The lower part of the secondary sleeve and the upper part of the spring clip each have a large spring limiting clamping structure.

[0020] The upper section of the clamping shaft is a bearing support handle, the lower section has a radial notch, and the middle section is a half shaft. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the initial state of an embodiment of the present invention.

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the clamping shaft contact cover in the embodiment.

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the spring-compressed pressure cap.

[0024] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the outer casing tooling and container casing in the embodiment.

[0025] Figure 5 yes Figure 1 A schematic diagram of the three-dimensional structure of the clamping shaft in the embodiment.

[0026] In the diagram: a) Outer casing fixture, b) Container outer casing, c) Pressure cap, d) Screw ring, 1) Cylinder, 2) Fixed sleeve, 2-1) Guide screw, 3) Primary moving sleeve, 3-1) Pin, 3-2) Key block, 3-3) Support screw, 4) Spring baffle, 5) Small spring, 6) Connecting bushing, 6-1) Guide pin, 7) Telescopic shaft, 7) Pressing shaft, 7-1) Spacer sleeve, 7-2) Bearing, 7-3) Positioning pin, 7-4) Secondary sleeve, 8) Sliding screw, 8-1) Spring plate gripper, 9) Large spring, 10) Limit fixture, 11) Servo motor, 14) Detailed Implementation

[0027] The basic structure of the automatic screw-in device for sealing the high-torque container in this embodiment is as follows: Figure 1 As shown, a cylinder 1 is installed at the upper end of the vertical fixed sleeve 2. The fixed sleeve 2 contains a first-stage movable sleeve 3 with an axial guide groove on its outer circle. The side wall of the fixed sleeve 2 is equipped with a guide screw 2-1 whose end matches the axial guide groove. Therefore, the two constitute a vertical movable pair.

[0028] The upper end of the primary moving sleeve 3 is connected to the telescopic end of the cylinder 1, and the lower end is equipped with a secondary sleeve 8, which is fixed to it by a key block 3-2 and a fastening screw 3-3, and a connecting sleeve 6, which is fixed to it by a pin 3-1. A telescopic shaft 7 with an axial groove on its outer circle is inserted into the connecting sleeve 6 for dynamic cooperation. The side wall of the connecting sleeve 6 is equipped with a guide pin 6-1 whose end matches the axial groove. Therefore, the primary moving sleeve 3 and the telescopic shaft 7 form a vertical moving pair through the connecting sleeve 6. The upper end of the connecting sleeve 6 has a countersunk hole to limit the axial position of the telescopic shaft 7.

[0029] A fixed spring baffle 4 is installed in the first-stage movable sleeve 3. A small spring 5 is installed between the spring baffle 4 and the guide hole at the upper end of the telescopic shaft 7 to make the telescopic shaft 7 tend to press down.

[0030] A rotatable clamping shaft 7-1, supported by upper and lower bearings 7-3, is installed in the lower end hole of the telescopic shaft 7. The upper and lower bearings 7-3 are separated from the telescopic shaft 7 by a spacer sleeve 7-2, which is positioned by a locating pin 7-4. The specific structure of the clamping shaft 7-1 is as follows: Figure 5 As shown, the upper section is the bearing support handle 7-1.3, the lower section has a radial notch 7-1.1, and the middle section is the half shaft 7-1.2. This allows space for the cable to be led out of the cover.

[0031] The lower end of the secondary sleeve 8 is fitted with a spring clip 9 that is adapted to it. Axially extending oblong holes are formed on both sides of the lower end of the secondary sleeve 8. These two oblong holes are respectively slidably engaged with sliding screws 8-1 mounted on the sidewalls of the spring clip 9, thus forming a limiting vertical movement pair between the lower end of the secondary sleeve 8 and the spring clip 9. The lower part of the secondary sleeve 8 and the upper part of the spring clip 9 each have a large spring 10 limiting clamping structure, causing the spring clip 9 to tend to press downwards and be supported from the inside out within the threaded ring d. The lower end of the secondary sleeve 8 is fixedly connected to a limiting fixture 11 via a quick-release thread. The lower end of this limiting fixture 11 is adapted to the threaded ring d with external threads and has an axially upper limiting structure.

[0032] Below the limiting fixture 11, a rotatable outer casing fixture a driven by a servo motor 14 is installed. A cylindrical container outer casing b with an internally threaded opening is placed inside this outer casing fixture a. See [link to specific structure] for details. Figure 4 .

[0033] The workflow of this embodiment is as follows:

[0034] 1) The pressure screw d is installed on the screw ring limiting fixture 11, the spring jaws 9 hold the inner ring of the pressure screw d, and the pressure cap c is placed inside the outer shell b of the container filled with easily expandable material; the cylinder 1 pushes the first-stage moving sleeve 3 downward, and the spring baffle 4 moves downward accordingly; as Figure 1 As shown, since the clamping shaft 7-1 does not contact the pressure cap, the small spring 5, under the action of the spring baffle 4, drives the connecting shaft 6, the secondary sleeve 8, the telescopic shaft 7, and the clamping shaft 7-1 to descend together.

[0035] 2) When the lower end of the clamping shaft 7-1 contacts the upper surface of the gland c, as Figure 2 As shown, cylinder 1 continues to push downwards, at which point small spring 5 is compressed, pressing shaft 7-1 presses down on pressure cap c, and primary sleeve 3 and secondary sleeve 8 continue to move downwards with pressure screw d.

[0036] 3) When the pressure screw d contacts the inner thread of the container shell, the servo motor 14 drives the shell fixture a to rotate, and the container shell b rotates together with the fixture, as shown. Figure 3 As shown, the pressure screw d begins to screw into the internal thread of the container shell b. At this time, the cylinder 1 continues to push downward, the small spring 5 continues to be compressed, and the limiting fixture 11 continues to push the pressure screw d downward. During the continued screwing process, the spring plate clamp 9 no longer clamps the inner ring of the pressure screw d, but compresses the spring 10 and gradually retracts into the secondary sleeve 8 until it is completely disengaged from the pressure screw d.

[0037] During the above-mentioned pressing and screwing process, the pressing shaft 7-1 can rotate together with the container shell cap c. When the lower end of 7-1 presses down on the cap c, it achieves the limiting of the cap c. The limiting fixture 11 and the lower end of the secondary sleeve 8 are quick-tight threads, so they can be replaced as needed according to the different specifications of the container shell and the pressing screw.

[0038] Experiments show that by using the device of this embodiment, the screw threading operation of the container shell can be easily completed, greatly improving work efficiency and ensuring assembly consistency.

[0039] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. An automatic screw-in device for sealing a high-torque container, comprising a vertically fixed sleeve (2) with a cylinder (1) mounted at its upper end, characterized in that: The fixed sleeve contains a primary movable sleeve (3) that forms a vertical moving pair with it. The upper end of the primary movable sleeve is connected to the cylinder telescopic end, and the lower end is equipped with a secondary sleeve (8) fixed thereto and a telescopic shaft (7) forming a vertical moving pair thereto. The telescopic shaft (7) is located in the secondary sleeve and tends to be pressed down. The lower end of the telescopic shaft is equipped with a rotatable clamping shaft (7-1), and the lower end of the secondary sleeve is equipped with a spring plate claw (9) that forms a vertical moving pair with it and is fixedly connected to a limiting fixture (11) that is adapted to a threaded ring with external threads; the spring plate claw (9) tends to press down and is supported inside the threaded ring from the inside out. A rotatable outer shell fixture (a) is placed below the limiting fixture, and the outer shell fixture holds a container shell with an internal thread.

2. The automatic screw-in device for sealing the high-torque container according to claim 1, characterized in that: The outer circumference of the primary movable sleeve has an axial guide groove, and the side wall of the fixed sleeve is equipped with a guide screw whose end matches the axial guide groove.

3. The automatic screw-in device for sealing the high-torque container according to claim 2, characterized in that: The lower end of the primary movable sleeve is fixedly connected to a connecting bushing, and a telescopic shaft with an axial groove on its outer circle is inserted into the connecting bushing. The side wall of the connecting bushing is equipped with a guide pin whose end matches the axial groove.

4. The automatic screw-in device for sealing high-torque containers according to claim 3, characterized in that: A fixed spring baffle is installed in the primary movable sleeve, and a small spring is installed between the spring baffle and the upper guide hole of the telescopic shaft to make the telescopic shaft tend to press down.

5. The automatic screw-in device for sealing the high-torque container according to claim 4, characterized in that: The lower end hole of the telescopic shaft is fitted with a rotatable clamping shaft supported by a bearing.

6. The automatic screw-in device for sealing high-torque containers according to claim 5, characterized in that: The lower end of the secondary sleeve is fitted with a spring clip that is adapted to it. The lower end of the secondary sleeve has an axially extending waist-shaped hole, which is slidably engaged with a sliding screw mounted on the side wall of the spring clip.

7. The automatic screw-in device for sealing high-torque containers according to claim 6, characterized in that: The lower part of the secondary sleeve and the upper part of the spring clip each have a large spring limiting clamping structure.

8. The automatic screw-in device for sealing the high-torque container according to any one of claims 1 to 7, characterized in that: The upper section of the clamping shaft is a bearing support handle, the lower section has a radial notch, and the middle section is a half shaft.

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