Floating sleeve drive for tightening a coil spring and method of use thereof

Abstract

This invention discloses a floating sleeve transmission device for tightening a coil spring and its usage method. It includes a cylindrical fixed ring, a motor bushing disposed inside the fixed ring and connected to a motor shaft, a lock cylinder sleeve connected to the fixed ring and having both axial and rotational floating capabilities, and a product bushing connected to the coil spring shaft of a pull rope sensor product. The lock cylinder sleeve achieves transmission by engaging with the key structures of both the motor bushing and the product bushing through a lock cylinder structure. Before tightening the coil spring, the coil spring is installed in its correct position by axially floating the lock cylinder sleeve, and the relative position between the lock cylinder sleeve and the product bushing is adjusted by rotational floating, achieving automatic insertion and transmission. The floating engagement between the lock cylinder sleeve and the fixed ring eliminates the need for repeated screw feeding compared to existing coupling and bushing connection methods, allowing for single-handed operation, improving efficiency and reducing operational complexity.

Description

Technical Field

[0001] This invention relates to the field of lock technology, and in particular to a floating sleeve transmission device for tightening coil springs and its method of use. Background Technology

[0002] Many sensor products (such as pull-cord sensors and long-angle sensors) utilize coil springs, primarily to achieve automatic self-recovery through their elasticity, as seen in wire winders. In these products, it's typically necessary to store potential energy in the coil spring; this process is called tightening the coil spring. Currently, common manual methods for tightening this spring include manually rotating the shaft connected to the spring, or using a motor to tighten it. This involves using a bushing or coupling to rigidly connect the shaft to the spring, with the motor driving the tightening action.

[0003] However, existing technologies have the following defects and shortcomings:

[0004] First, manual methods are not only inefficient but also pose safety hazards. Second, when using motors, the screws need to be tightened and loosened each time the connection is made using bushings or couplings. This repeated operation is inefficient and affects the handling of coil springs, making the operation more complicated. In mass production, the workload increases significantly, the operation becomes more cumbersome, production efficiency is greatly reduced, and the degree of automation is low. Summary of the Invention

[0005] The purpose of this invention is to provide a floating sleeve transmission device for tightening coil springs and its method of use, in order to solve the above-mentioned technical problems.

[0006] The technical solution adopted in this invention is as follows:

[0007] A floating sleeve transmission device for tightening a coil spring includes a cylindrical fixed ring, a motor bushing disposed inside the fixed ring and connected to a motor shaft, a lock cylinder sleeve connected to the fixed ring and having axial floating and rotational floating functions respectively, and a product bushing connected to the coil spring shaft of a pull rope sensor product. The lock cylinder sleeve achieves transmission by engaging with the key structure of the motor bushing and the key structure of the product bushing respectively through a lock cylinder structure.

[0008] Before tightening the coil spring, the coil spring is installed in its upper position by axially floating the lock cylinder sleeve, and the relative position between the lock cylinder sleeve and the product bushing is adjusted by rotating the floating mechanism to achieve automatic insertion and transmission.

[0009] Preferably, the outer wall of the lock cylinder sleeve has flat surfaces on both sides, and a through pin hole is provided on each of the flat surfaces. The outer wall of the fixing ring has sliding holes on both sides along the axial direction. The lock cylinder sleeve is located inside the fixing ring, and a pin passes through the pin hole and the sliding hole in sequence, so that the lock cylinder sleeve can float axially along the sliding hole.

[0010] Preferably, the outer wall of the motor bushing is provided with a first shoulder, the key structure at one end of the motor bushing is inserted into the top of the lock cylinder sleeve, and can be locked with the lock cylinder structure by rotation and floating. The other end of the motor bushing has a flat groove for fixed insertion with the motor shaft, and flat portions are respectively provided on both sides of the outer wall of the other end. The flat portions have through threaded holes for screws to be inserted and fixed with the motor shaft.

[0011] Preferably, the outer wall of the product bushing is provided with a second shoulder, the key structure at one end of the product bushing is inserted into the bottom of the lock cylinder sleeve and can be locked together with the lock cylinder structure of the lock cylinder sleeve, and the other end of the product bushing is provided with a mounting groove for fixedly inserting into the coil spring shaft.

[0012] Preferably, the key structure is a key body arranged in a straight line, and the lock cylinder structure is one or two protrusions arranged opposite each other on the inner wall of the lock cylinder sleeve, thereby forming a rotatable movable area with the center of the radial section of the lock cylinder sleeve as the center.

[0013] As a further preferred embodiment, the fixing ring rotates together with the lock cylinder sleeve, and the lock cylinder sleeve rotates and floats by the key body of the motor bushing rotating within the rotatable range. The protruding structure locks and drives by interlocking with the key body.

[0014] Preferably, the key structure includes a key body arranged in a straight line and lock plates integrally formed at both ends of the key body. The two lock plates are located on opposite sides of the long axis of symmetry of the key body, forming a Z-shaped structure together with the key body. The lock cylinder structure includes two protrusions disposed opposite to each other on the inner wall of the lock cylinder sleeve, thereby forming a rotatable movable area with the center of the radial section of the lock cylinder sleeve as the center.

[0015] As a further preferred embodiment, the fixing ring rotates together with the lock cylinder sleeve, and the rotational floating of the lock cylinder sleeve is achieved by the rotation of the key body of the motor bushing and the lock plate within the rotatable range. The protruding structure achieves locking and transmission by interlocking with the lock plate.

[0016] As a further preferred embodiment, the bottom of the protruding structure is smoothly connected to or integrally formed with the inner wall of the lock cylinder sleeve, the top of the protruding structure is provided with a rounded chamfer, and the surfaces of the key structure and the protruding structure are coated with a wear-resistant coating.

[0017] A method of using a floating sleeve transmission device for tightening coil springs, the method comprising:

[0018] S1. Install the motor on the Z-shaped bracket on the workbench, then insert the motor shaft into the flat slot of the motor shaft sleeve and tighten it with screws.

[0019] S2. Connect the mounting slot of the product bushing to the coil spring shaft;

[0020] S3. Slide the lock cylinder sleeve upward along the sliding hole to install the coil spring with the product bushing into the working position on the worktable and fix it.

[0021] S4. The rotating fixed ring drives the lock cylinder sleeve to rotate within the rotatable range, so that the lower end of the lock cylinder sleeve is aligned with the key structure of the product bushing. At this time, the lock cylinder sleeve automatically falls under its own weight, completing the transmission connection between the lower end of the lock cylinder sleeve and the product bushing.

[0022] S5. Start the motor. The motor shaft drives the motor bushing to rotate, and the motor bushing transmits torque to the lock cylinder sleeve, causing the lock cylinder sleeve to drive the product bushing to rotate, thereby driving the coil spring shaft to rotate and realizing the coil spring tightening operation.

[0023] S6. After the coil spring is tightened, slide the lock cylinder sleeve upward along the sliding hole to separate the lock cylinder sleeve from the product bushing. Remove the coil spring from the product bushing to complete the tightening.

[0024] The above technical solution has the following advantages or beneficial effects:

[0025] (1) In this invention, the lock cylinder sleeve and the fixed ring can float together. Compared with the connection methods such as couplings and bushings in the prior art, there is no need to repeatedly feed in the screws. It can be operated with one hand, which improves efficiency and reduces the complexity of operation.

[0026] (2) In this invention, only the lock cylinder sleeve needs to be slid up and down to leave space for product installation. There is no need for complicated mechanical structure. Compared with the existing technology, couplings and bushings have smaller space requirements.

[0027] (3) In this invention, the relative floating arrangement of the fixing ring, motor bushing, lock core sleeve and product bushing reduces the installation accuracy requirements of the two shafts compared to couplings and bushings, thus increasing applicability. Attached Figure Description

[0028] Figure 1This is an exploded schematic diagram of the floating sleeve transmission device for tightening coil springs in this invention;

[0029] Figure 2 This is an assembly diagram of the floating sleeve transmission device for tightening coil springs in this invention;

[0030] Figure 3 This is a diagram showing the usage state of the floating sleeve transmission device for tightening coil springs in this invention;

[0031] Figure 4 This is a schematic diagram of the key structure in this invention that mates with the lock cylinder structure within the lock cylinder sleeve. Figure 1 ;

[0032] Figure 5 This is a schematic diagram of the key structure in this invention that mates with the lock cylinder structure within the lock cylinder sleeve. Figure 2 ;

[0033] Figure 6 This is another structural schematic diagram of the floating sleeve transmission device used for tightening coil springs in this invention.

[0034] In the diagram: 1. Retaining ring; 101. Sliding hole; 2. Motor bushing; 201. Flat part; 202. Threaded hole; 203. First shoulder; 3. Lock cylinder sleeve; 301. Flat surface; 302. Pin hole; 4. Product bushing; 5. Key structure; 6. Lock cylinder structure; 601. Protruding structure; 7. Coil spring; 8. Motor; 9. Pin; 10. Integrated motor bushing. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Figure 1 This is an exploded schematic diagram of the floating sleeve transmission device for tightening coil springs in this invention; Figure 2 This is an assembly diagram of the floating sleeve transmission device for tightening coil springs in this invention; Figure 3 This is a diagram showing the usage state of the floating sleeve transmission device for tightening coil springs in this invention; Figure 4 This is a schematic diagram of the key structure in this invention that mates with the lock cylinder structure within the lock cylinder sleeve. Figure 1 ; Figure 5 This is a schematic diagram of the key structure in this invention that mates with the lock cylinder structure within the lock cylinder sleeve. Figure 2 ; Figure 6 This is another structural schematic diagram of the floating sleeve transmission device used for tightening the coil spring in this invention. Please refer to... Figures 1 to 6 As shown, a floating sleeve transmission device for tightening a coil spring includes a cylindrical fixed ring 1, a motor bushing 2 disposed inside the fixed ring 1 and connected to the rotating shaft of a motor 8, a lock cylinder sleeve 3 connected to the fixed ring 1 and having axial floating and rotational floating respectively, and a product bushing 4 connected to the coil spring shaft of a pull rope sensor product. The lock cylinder sleeve 3 achieves transmission by locking the key structure 5 of the motor bushing 2 and the product bushing 4 respectively through the lock cylinder structure 6.

[0039] Before tightening the coil spring 7, the coil spring 7 is installed in its upper position by axially floating the lock cylinder sleeve 3, and the relative position between the lock cylinder sleeve 3 and the product bushing 4 is adjusted by rotating the floating mechanism to achieve automatic insertion and transmission. In this embodiment, see... Figure 1 As shown, the fixing ring 1 is a cylindrical sleeve structure with an opening at the bottom and a circular hole at the top for the motor shaft sleeve 2 to pass through, facilitating the insertion of the motor shaft into the motor shaft sleeve 2. The lock cylinder sleeve 3 can move axially within the fixing ring 1, achieving axial floating. It can be operated with only one hand, improving work efficiency and reducing operational complexity.

[0040] In this embodiment, the product bushing 4 is used to connect the coil spring shaft of the coil spring 7. The product bushing 4 includes a body part and a second shoulder located in the middle of the body part. One end of the body part is provided with a flat key or a flat key and lock plates formed at both ends of the flat key. The two flat keys are located on opposite sides of the long axis of symmetry to form a Z-shaped structure for contact transmission with the lock cylinder structure 6 inside the lock cylinder sleeve 3. The other end of the body part has an internal shape similar to that of the coil spring shaft and is used to cooperate with the coil spring shaft. When the external motor 8 applies torque to the motor bushing 2, the motor bushing 2 will drive the lock cylinder sleeve 3 to rotate, and the lock cylinder sleeve 3 will drive the product bushing 4 to rotate. The product bushing 4 will further drive the coil spring shaft of the coil spring 7 to rotate, tightening the coil spring 7.

[0041] Furthermore, as a preferred embodiment, flat surfaces 301 are respectively formed on both sides of the outer wall of the lock cylinder sleeve 3, and a through pin hole 302 is respectively formed on each flat surface 301. Sliding holes 101 are respectively formed on both sides of the outer wall of the fixing ring 1 along the axial direction. The lock cylinder sleeve 3 is located inside the fixing ring 1, and a pin 9 passes through the pin hole 302 and the sliding hole 101 in sequence, allowing the lock cylinder sleeve 3 to float axially along the sliding hole 101. In this embodiment, see... Figure 1 As shown, the flat surface 301 is provided on two opposite side walls at the bottom of the lock cylinder sleeve 3. The pin hole 302 is provided to cooperate with the latch 9. When the lock cylinder sleeve 3 enters the fixed ring 1, the latch 9 passes through the pin hole 302 and the sliding hole 101, thereby confining the lock cylinder sleeve 3 within the fixed ring 1. Since the sliding hole 101 is strip-shaped and arranged along the axial direction of the lock cylinder sleeve 3, the latch 9 can slide within the sliding hole 101, thus enabling the lock cylinder sleeve 3 to float axially within the fixed ring 1.

[0042] The present invention adopts a floating connection method, which provides a new design idea for inter-axis connection by enabling plug-and-play connection.

[0043] In this invention, the lock cylinder sleeve 3 and the fixing ring 1 are connected by a floating connection, which requires less space compared to couplings and bushings. Traditional connections using couplings and bushings typically require space for product installation; the simplest solution is to place the motor 8 horizontally, which necessitates vertical installation, resulting in a larger footprint and higher space requirements. The floating connection method in this invention only requires the lock cylinder sleeve 3 to slide up and down to create installation space, eliminating the need for complex mechanical structures and minimizing space requirements.

[0044] The floating sleeve transmission device for tightening coil springs in this invention has lower requirements for the installation accuracy of the two shafts compared to couplings and bushings. The latter typically have specific requirements for the coaxiality of the two shafts during use. Furthermore, frequent rapid disassembly and assembly during operation makes it even more difficult to guarantee coaxiality. This invention, by employing a floating connection method, effectively solves this problem.

[0045] Furthermore, in a preferred embodiment, the outer wall of the motor bushing 2 is provided with a first shoulder 203. The key structure 5 at one end of the motor bushing 2 is inserted into the top of the lock cylinder sleeve 3 and can be locked to the lock cylinder structure 6 by rotation and floating. The other end of the motor bushing 2 has a flat groove for fixed insertion with the motor shaft, and flat portions 201 are respectively provided on both sides of the outer wall of the other end. The flat portions 201 have through threaded holes 202 for screws to pass through and fix the motor shaft. When the key structure 5 is inserted into the top of the lock cylinder sleeve 3, the first shoulder 203 can abut against the lock cylinder sleeve 3, playing a positioning role.

[0046] Furthermore, as a preferred implementation, a bearing can also be fitted onto the outer wall of the motor bushing 2. The bearing is positioned at the first shoulder 203. The outer ring of the bearing is connected to the inner wall of the fixing ring 1, and the inner ring of the bearing is connected to the outer wall of the motor bushing 2. With the addition of the bearing, the shoulder is no longer needed to provide support; instead, the bearing provides the support. Compared to the shoulder, bearing provides more stable pressure bearing and smoother rotation.

[0047] Furthermore, as a preferred embodiment, the outer wall of the product bushing 4 is provided with a second shoulder. The key structure 5 at one end of the product bushing 4 is inserted into the bottom of the lock cylinder sleeve 3 and can be locked together with the lock cylinder structure 6 of the lock cylinder sleeve 3. The other end of the product bushing 4 has a mounting groove for fixedly inserting with the coil spring shaft. In this embodiment, the end of the motor shaft is shaped similarly to a flat slot, which facilitates the insertion of the motor shaft into the flat slot. A round hole is provided at the end of the motor shaft to facilitate the passage of a screw. When the motor shaft is inserted into the flat slot, the screw is passed through the threaded hole 202 and the round hole, thereby locking the motor shaft in the flat slot.

[0048] In this embodiment, both the key structure 5 and the lock cylinder structure 6 have two types of structures. One type is where the key structure 5 is a key body arranged in a straight line, and the lock cylinder structure 6 is one or two opposing protrusions 601 located on the inner wall of the lock cylinder sleeve 3, thereby forming a rotatable area centered on the radial cross-section center of the lock cylinder sleeve 3. See also: Figure 4As shown, with the top of the lock cylinder sleeve 3 as the starting point of 0° and the bottom as 180°, the flat surface 301 is located in the 90° and 270° directions, while the protruding structure 601 is located in the 0° direction on the inner wall of the lock cylinder sleeve 3. The protruding structure 601 cooperates with the one-shaped key structure 5 of the motor shaft sleeve 2 to form an active area. The active area is centered on the radial cross-section center of the lock cylinder sleeve 33, and has an arc range of 18 to 342°, totaling 324°.

[0049] Furthermore, as a preferred embodiment, the fixed ring 1 and the lock cylinder sleeve 3 rotate together. The rotation and floating of the lock cylinder sleeve 3 are achieved by the key body of the motor bushing 2 rotating within its rotatable range. The protruding structure 601 locks and transmits power by engaging with the key body. In this embodiment, the lock cylinder sleeve 3 can drive the fixed ring 1 to rotate together under the drive of the motor bushing 2. The motor bushing 2 is connected to the motor shaft, and the motor 8 drives the motor bushing 2 to rotate through the motor shaft. The key body of the motor bushing 2 engages with the protruding structure 601 inside the lock cylinder sleeve 3, thus transmitting force.

[0050] In this embodiment, another structure for the key structure 5 and the lock cylinder structure 6 is as follows: The key structure 5 includes a key body arranged in a straight line and lock plates integrally formed at both ends of the key body. The two lock plates are located on opposite sides of the long axis of symmetry of the key body, forming a Z-shaped structure. The lock cylinder structure 6 includes two protruding structures 601 oppositely disposed on the inner wall of the lock cylinder sleeve 3, thereby forming a rotatable movable area with the radial cross-section center of the lock cylinder sleeve 3 as the center. In this embodiment, see... Figure 5 As shown, with the top of the lock cylinder sleeve 3 as 0° and the bottom as 180°, the flat surfaces 301 on the outer surface of the lock cylinder sleeve 3 are located at 90° and 270° respectively. Inside the lock cylinder sleeve 3, there is an inwardly protruding structure 601 at both the 0° and 180° directions. For the specific structure of the key structure 5, please refer to [reference needed]. Figure 5 As shown, this design enhances the structural strength of the key body while maximizing the usable area. Figure 5 As can be seen, the key structure 5 is no longer a simple straight line, but has become a Z-shaped structure. This also reduces the overall thickness of the key structure 5 and the raised structure 601, resulting in an active area with a radius of 25–180° and 205–360°, totaling 310°, centered on the radial cross-section of the lock cylinder sleeve 3. When the motor bushing 2 rotates, the key structure 5 can contact the lock cylinder structure 6, causing the lock cylinder sleeve 3 to rotate.

[0051] Furthermore, as a preferred embodiment, the fixed ring 1 and the lock cylinder sleeve 3 rotate together. The rotation and floating of the lock cylinder sleeve 3 are achieved by the key body of the motor bushing 2 and the lock plate rotating within the rotatable range. The protruding structure 601 locks and drives by interlocking with the lock plate.

[0052] Furthermore, as a preferred embodiment, the bottom of the protruding structure 601 is smoothly connected to or integrally formed with the inner wall of the lock cylinder sleeve 3, the top of the protruding structure 601 is provided with a rounded chamfer, and the surfaces of the key structure 5 and the protruding structure 601 are coated with a wear-resistant coating to prevent wear and increase service life.

[0053] During assembly, the bearing is inserted from the upper end of the motor bushing 2 and secured at the first shoulder 203 (the bearing can also be omitted here). Then, the motor bushing 2 is inserted into the retaining ring 1, and the flat slot of the motor bushing 2 is connected to the motor shaft, allowing the motor bushing 2 to extend beyond the retaining ring 1. Next, the key structure 5 on the motor bushing 2 is inserted into the top of the lock cylinder sleeve 3. The length of the key structure 5 on the motor bushing 2 is less than the depth of the upper movable area of ​​the lock cylinder sleeve 3. This ensures that during normal use, when the lock cylinder sleeve 3 slides up and down, the key structure 5 of the motor bushing 2 cannot disengage from the upper movable area of ​​the lock cylinder sleeve 3, and also ensures that the lower end of the key structure 5 of the motor bushing 2 does not contact the pin 9. Then, the pin 9 is passed through the pin hole 302 and the sliding hole 101, confining the lock cylinder sleeve 3 within the retaining ring 1, completing the assembly of the lock cylinder sleeve 3. At this time, the lock cylinder sleeve 3 can slide up and down along the sliding hole 101 and rotate circumferentially in the movable area relative to the motor shaft sleeve 2 (when installed, the motor shaft and motor shaft sleeve 22 are in a vertical position and cannot be rotated). This adds two degrees of freedom to the motor shaft and motor shaft sleeve 2, which are fixed by the lock cylinder sleeve 3.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the scope of protection and implementation of the present invention.

[0055] A method of using a floating sleeve transmission device for tightening coil springs, the method comprising:

[0056] S1. Install motor 8 on the Z-shaped bracket on the workbench, then insert the motor shaft of motor 8 into the flat slot of motor shaft sleeve 2 and tighten it with screws.

[0057] S2. Connect the mounting slot of the product bushing 4 to the coil spring shaft;

[0058] S3. Slide the lock cylinder sleeve 3 upward along the sliding hole 101, and install the coil spring 7 with the product bushing 4 installed into the working position on the worktable and fix it.

[0059] S4. The rotating fixed ring 1 drives the lock cylinder sleeve 3 to rotate within the rotatable range, so that the lower end of the lock cylinder sleeve 3 is aligned with the key structure 5 of the product bushing 4. At this time, the lock cylinder sleeve 3 automatically falls under its own weight, completing the transmission connection between the lower end of the lock cylinder sleeve 3 and the product bushing 4.

[0060] S5. Start motor 8. The motor shaft drives motor bushing 2 to rotate. Motor bushing 2 transmits torque to lock cylinder sleeve 3, which in turn drives product bushing 4 to rotate, thereby driving coil spring shaft to rotate and achieving the tightening operation of coil spring 7.

[0061] S6. After the coil spring 7 is tightened, slide the lock cylinder sleeve 3 upward along the sliding hole 101 to separate the lock cylinder sleeve 3 from the product bushing 4. Remove the coil spring 7 from the product bushing 4 to complete the tightening.

[0062] In this embodiment, the motor bushing 2 enables a circumferential floating fit between the motor shaft and the lock cylinder sleeve 3. The product bushing 4 and the lock cylinder sleeve 3 also have a circumferential floating fit. After the motor 8 rotates, the key structure 5 and the lock cylinder structure 6 are locked together, achieving a transmission connection. Given that alignment can be achieved simply by rotating the lock cylinder sleeve 3, the shapes of the key structure 5 and the lock cylinder structure 6 need to be designed.

[0063] In practical applications, for batch automated tightening of coil springs 7, multiple through holes can be equally spaced laterally on the workbench surface to enable the lifting and lowering of work positions. Each work position moves vertically under the drive of a lifting cylinder. During operation, multiple coil springs 7 to be tightened are placed on the work positions. Additionally, each work position can rotate slightly axially under the drive of a motor 8, thus aligning with the moving area in conjunction with the lock cylinder sleeve 3. The motor 8 for tightening the coil springs 7 corresponding to each work position is mounted on a Z-shaped bracket directly above the work position (workbench). The structure is similar to... Figure 3 As shown, a vertical fixed plate is set on the workbench surface. Vertical slide rails and sliders are set on the fixed plate at the corresponding work positions. The vertical movement is driven by a cylinder or motor 8. The slider is fixed to the fixed ring 1, so that the fixed ring 1 can slide up and down automatically.

[0064] See Figure 6The diagram shows another structural schematic of the floating sleeve transmission device for tightening the coil spring 7 in this invention. This structure does not require a separate fixing ring 1 and lock cylinder sleeve 3, but adopts an integrated design with only an integrated motor bushing 2 and a product bushing 4. In its use, the upper end of the integrated motor bushing 2 is connected and fixed to the motor shaft, and the product bushing 4 is installed and connected to the coil spring shaft. Since the integrated motor bushing 2 is fixed to the motor shaft and cannot rotate, it is necessary to manually rotate the coil spring shaft to overcome the force of the coil spring 7 during use. The key structure 5 of the product bushing 4 is aligned with the movable area at the lower end of the integrated motor bushing 2 and then inserted to complete the connection.

[0065] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A floating sleeve drive for tensioning a coil spring, characterized in that The application relates to a lock cylinder and a motor shaft sleeve, a lock core sleeve and a product shaft sleeve, and a lock cylinder and a motor shaft sleeve, a lock core sleeve and a product shaft sleeve. The lock core sleeve is axially floated to install the spring, and the relative position between the lock core sleeve and the product shaft sleeve is adjusted through rotation floating to realize automatic plug-in transmission.

2. A floating sleeve drive for tensioning a coil spring as defined in claim 1, characterized in that Two sides of the outer wall of the lock core sleeve are respectively provided with flat surfaces, and through holes are respectively formed in the flat surfaces; the outer wall of the fixed ring is provided with sliding holes in the axial direction; the lock core sleeve is located in the fixed ring, and the lock core sleeve can be axially floated along the sliding holes through the insertion of the pin into the through holes and the sliding holes.

3. The floating sleeve drive for tensioning a coil spring of claim 1 wherein, The outer wall of the motor shaft sleeve is provided with a first shaft shoulder; the lock key structure at one end of the motor shaft sleeve is inserted into the top of the lock core sleeve and can be locked with the lock core structure through rotation floating; the other end of the motor shaft sleeve is internally provided with a flat slot for fixed plug-in with the motor shaft, and the outer wall of the other end is respectively provided with flat parts; the through screw holes are formed in the flat parts to fix the motor shaft through the screw.

4. The floating sleeve drive for tensioning a coil spring of claim 1 wherein, The outer wall of the product shaft sleeve is provided with a second shaft shoulder; the lock key structure at one end of the product shaft sleeve is inserted into the bottom of the lock core sleeve and can be locked with the lock core structure of the lock core sleeve; the other end of the product shaft sleeve is provided with an installation slot for fixed plug-in with the spring shaft.

5. The floating sleeve drive for tensioning a coil spring of claim 1 wherein, The lock key structure is a lock key body arranged in a character type; the lock core structure is one or two protruding structures arranged on the inner wall of the lock core sleeve, thereby forming a rotatable activity area with the center of the radial section of the lock core sleeve as the center.

6. A floating sleeve drive for tensioning a coil spring as defined in claim 5, characterized in that The fixed ring and the lock core sleeve are jointly rotated, the lock core sleeve is rotationally floated through the rotation of the lock key body of the motor shaft sleeve in the rotatable activity area, and the protruding structure is locked and transmitted through the mutual clamping of the lock key body.

7. The floating sleeve drive for tensioning a coil spring of claim 1 wherein, The lock key structure comprises a lock key body arranged in a character type and lock plates integrally formed at two ends of the lock key body; the two lock plates are respectively located at the two sides of the long symmetry axis of the lock key body and jointly form a Z-shaped structure with the lock key body; the lock core structure comprises two protruding structures arranged on the inner wall of the lock core sleeve, thereby forming a rotatable activity area with the center of the radial section of the lock core sleeve as the center.

8. A floating sleeve drive for tensioning a coil spring as defined in claim 7, characterized in that The fixed ring and the lock core sleeve are jointly rotated, the lock core sleeve is rotationally floated through the rotation of the lock key body and the lock plate of the motor shaft sleeve in the rotatable activity area, and the protruding structure is locked and transmitted through the mutual clamping of the lock plate.

9. A floating sleeve drive for tensioning a coil spring as claimed in claim 5 or 7, characterized in that The bottom of the convex structure is smoothly connected with or integrally formed with the inner wall of the lock cylinder sleeve, the top of the convex structure is provided with a smooth chamfer, and the surfaces of the lock key structure and the convex structure are coated with wear-resistant coating.

10. A method of using a floating sleeve drive for tensioning a coil spring, characterized in that The method of using the floating sleeve transmission device for tightening a coil spring according to any one of claims 1-9, the method comprising: S1, installing the motor on the Z-shaped support on the workbench, then inserting the motor shaft into the flat slot of the motor shaft sleeve, and locking by screw; S2, connecting the installation groove of the product shaft sleeve with the coil spring shaft; S3, sliding the lock cylinder sleeve upward along the sliding hole, and loading the coil spring with the product shaft sleeve into the working position on the workbench and fixing; S4, rotating the fixing ring to drive the lock cylinder sleeve to rotate within the rotatable active area, and after the lower end of the lock cylinder sleeve is aligned with the lock key structure of the product shaft sleeve, the lock cylinder sleeve automatically falls under the influence of its own gravity, and the transmission connection between the lower end of the lock cylinder sleeve and the product shaft sleeve is completed; S5, starting the motor, the motor shaft drives the motor shaft sleeve to rotate, and the motor shaft sleeve transmits the torque to the lock cylinder sleeve, so that the lock cylinder sleeve drives the product shaft sleeve to rotate, thereby driving the coil spring shaft to rotate, and the tightening operation of the coil spring is realized; S6, after the coil spring is tightened, sliding the lock cylinder sleeve upward along the sliding hole, so that the lock cylinder sleeve is separated from the product shaft sleeve, the coil spring is removed from the product shaft sleeve, and the tightening is completed.

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