A device and method for controlling tightening torque

Abstract

The application discloses a device and method for controlling tightening torque, which mainly comprises a shell and an inner sleeve, the shell and the inner sleeve form a guide rail; a floating claw is slidably arranged outside the guide rail and moves along the track of the guide rail; a plurality of sliding blocks are arranged on the inner side of the floating claw in the length direction, the floating claw is slidably matched with a driving block through the sliding blocks; the lower end of the floating claw is clamped with a product, and the product is tightened when the driving block drives the floating claw to rotate; the driving block is driven by a driving mechanism with adjustable torque. The application discloses a device for controlling tightening torque, and the device and method for controlling tightening torque can avoid obstacles and accurately adjust the torque.

Description

Technical Field

[0001] This invention relates to tightening equipment, and more particularly to a device for controlling tightening torque. Background Technology

[0002] like Figures 12-13 As shown, this type of product uses a steel band to secure the cap to the housing, preventing the cap from being lost after being unscrewed. However, during the production process, the steel band obstructs the tightening of the cap, making it impossible to use a machine; it must be tightened by hand. Finally, a torque wrench is required to inspect each product individually, making the process cumbersome and increasing production costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device for controlling tightening torque, which can avoid the obstruction of the steel strip and achieve tightening of the workpiece; in addition, it can also precisely control the torque.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A device for controlling tightening torque includes a housing and an inner sleeve, which form a guide rail. A floating claw is slidably disposed inside the guide rail and moves along the trajectory of the guide rail. Multiple sliders are provided on the inner side of the floating claw along the length direction, and the floating claw slides into a drive block through the sliders. The lower end of the floating claw engages with the product, and the product is tightened when the drive block drives the floating claw to rotate.

[0006] The drive block is driven by an adjustable torque drive mechanism.

[0007] The guide rail is an annular slide groove, which includes high sections on the left and right and low sections on the front and back. The high sections and low sections are smoothly connected by inclined sections.

[0008] The floating claw includes multiple arc-shaped plates, which are spliced ​​together to form a ring structure; each arc-shaped plate has a slider on its inner side, and each arc-shaped plate has a roller mounted at the same height on its outer side via a pin.

[0009] The drive block includes a drive block body. The outer wall of the drive block body is provided with a groove that matches the slider. The center of the drive block body is provided with a threaded mounting hole, a shaft through hole, and a shaft positioning hole vertically from top to bottom. The drive block body between the threaded mounting hole and the shaft positioning hole is provided with a plurality of transmission pin positioning holes in the circumferential direction. The transmission pin positioning holes are connected to the threaded mounting hole and the shaft positioning hole.

[0010] The torque adjusting mechanism comprises an adjusting wheel, the outer side of the adjusting wheel is in threaded connection with the inner wall of the threaded mounting hole, the lower end of the adjusting wheel is provided with a compression spring, the lower end of the compression spring is provided with a bushing, the bushing clamps the transmission needle in the driving block into the shaft positioning hole of the driving shaft, the large head part of the lower end of the driving shaft is arranged in the rotating shaft positioning hole and is limited by the shaft stop ring, and the upper end of the driving shaft freely penetrates the rotating shaft perforation, the bushing and the adjusting wheel and then extends out.

[0011] The driving block is vertically provided with a spring needle positioning hole in the circumferential direction, a spring needle spring is mounted in the spring needle positioning hole, a positioning spring needle is arranged above the spring needle spring, and the upper end of the positioning spring needle is clamped into the adjusting positioning hole of the adjusting wheel.

[0012] The lower end of the driving shaft is provided with a screw tightening head.

[0013] A method for controlling the tightening torque, comprising the following steps:

[0014] Step 1), first, the roller of the floating jaw is arranged in the guide rail formed by the outer shell and the inner sleeve, and then the outer shell and the inner sleeve are fixed by bolts, so that the arc-shaped plate of the floating jaw can run along the guide rail and then up and down when rotating; after passing through the steel belt, the arc-shaped plate at this position moves upward and then avoids the steel belt;

[0015] Step 2), the driving block is inserted from the lower end to the upper end and then extends out through the floating jaw and the inner sleeve, at this time, the groove of the driving block is matched with the sliding block of the floating jaw, the floating jaw can be driven to rotate when the driving block rotates, and the arc-shaped plate of the floating jaw can independently up and down when rotating; the lower end of the driving block is large in diameter, the upper end of the driving block is small in diameter, and the upper part of the driving block is provided with an annular groove;

[0016] After the driving block extends out of the inner sleeve, the shaft stop ring is arranged in the annular groove of the upper part of the driving block, and the driving block is limited to move downward by the shaft stop ring; after installation, the driving block can only rotate in the circumferential direction and cannot move up and down;

[0017] Step 3), the spring needle spring and the positioning spring needle are arranged in the plurality of spring needle positioning holes in the circumferential direction of the driving block; the driving shaft is inserted into the center of the driving block, the large head part of the lower end of the driving shaft is limited by the shaft stop ring in the rotating shaft positioning hole at the bottom end of the driving block; the upper end of the driving shaft freely penetrates the rotating shaft perforation, the bushing and the adjusting wheel in turn and then extends out; a handle for operation can be connected to the top end of the driving shaft in the later stage; the handle can be manually or mechanically rotated to drive the driving shaft to rotate;

[0018] Step 4), the transmission needle is inserted into the transmission needle positioning hole, and the lower end of the transmission needle falls into the shaft positioning hole on the large head end of the driving shaft; the bushing is sleeved on the driving shaft, and the bushing falls on the bottom surface of the threaded mounting hole; the compression spring is further sleeved on the bushing, and then the adjusting wheel is penetrated through the driving shaft and is in threaded connection with the threaded mounting hole of the driving block; the threaded sleeve at the lower end of the adjusting wheel presses the compression spring downward, so that the bushing clamps the transmission needle on the driving shaft;

[0019] Step 5, and because the lower end surface of the wheel body of the adjusting wheel is provided with a plurality of adjusting positioning holes, after the adjusting wheel is installed, the positioning elastic pin is clamped with the adjusting positioning hole;

[0020] Step 6, when it is needed to drive the product cover to rotate, the four positioning columns of the device are inserted into the positioning perforations of the product, so that the relative position between the device and the product is kept unchanged; at this time, the arc-shaped plates of the floating clamping jaw are in the high position section of the guide rail at the steel belt, so that the arc-shaped plates at this position move upward to avoid the steel belt; and the arc-shaped plates at other positions of the floating clamping jaw cooperate with the product cover to tightly grip;

[0021] Step 7, rotate the handle, and the driving shaft is rotated accordingly; because the driving shaft and the driving block are clamped through the transmission pin, when the driving shaft rotates, the driving shaft drives the driving block to rotate; the rotation of the driving block can drive the floating clamping jaw to rotate, and the rotation of the floating clamping jaw can drive the product cover to rotate, thereby tightening the product cover on the product shell;

[0022] Step 8, during the rotation of the driving shaft, because the high position section of the device always corresponds to the steel belt, when the arc-shaped plates of the floating clamping jaw run to the high position section on the guide rail, the arc-shaped plates will move upward to automatically avoid the steel belt, so that whether manual or mechanical means can directly drive the driving shaft of the device to rotate circumferentially without any obstacles;

[0023] Step 9, when it is needed to increase the torque, the wheel body of the adjusting wheel can be rotated to move the adjusting wheel downward by a distance, so that the elastic force of the compression spring increases, and the force required for the transmission pin to be lifted upward from the shaft positioning hole of the driving shaft also increases; that is, the driving shaft needs to provide a larger torque to make the transmission pin disengage from the driving shaft; because when the driving shaft and the transmission pin are not disengaged, the driving shaft can drive the driving block and the floating clamping jaw to rotate through the transmission pin, thereby tightening the product cover; when the driving shaft and the transmission pin are disengaged, the driving shaft will not drive the driving block and the floating clamping jaw to rotate;

[0024] In this way, when the adjusting wheel is rotated to increase the torque of the driving shaft, the tightening torque for tightening the product cover can be increased, so that the product cover is tightened more tightly; when the adjusting wheel is reversely rotated to increase the torque of the driving shaft, the tightening torque for tightening the product cover can be reduced.

[0025] The device for controlling the tightening torque has the following technical effects:

[0026] 1), by setting the spliced floating clamping jaw, the arc-shaped plate of the floating clamping jaw can be independently lifted when running along the guide rail; the sliding block of the arc-shaped plate of the floating clamping jaw is matched with the groove of the driving block, so that the floating clamping jaw can rotate circumferentially; since the high section of the guide rail corresponds to the steel belt of the product, when the arc-shaped plate of the floating clamping jaw runs to the high section of the guide rail, the arc-shaped plate moves upward to separate from the product cover body and is located above the steel belt of the product; the arc-shaped plates of the floating clamping jaws at other positions still frequently grab the product cover body, and the product cover body is tightened in the rotating process. Therefore, when the device is used for tightening the cover body with an obstacle, the obstacle can be avoided. The device can be directly operated manually or mechanically driven to act, which is simple and efficient.

[0027] 2), when the transmission needle is not separated from the driving shaft, the driving shaft can drive the floating clamping jaw to rotate and tighten the product cover body; when the transmission needle is separated from the driving shaft, the driving shaft cannot drive the floating clamping jaw to rotate. Therefore, by rotating the adjusting wheel, the elastic force of the compression spring can be increased after moving under the adjusting wheel, the torque required for the transmission needle to separate from the driving shaft is increased, and the torque for tightening the product cover body is increased, and vice versa. The torque control precision in the present application lies in the following points: 1), the pitch of the threaded sleeve of the adjusting wheel; 2), the distance between the positioning holes; 3), the elastic coefficient of the spring needle spring; 4), the design of the transmission needle and the shaft positioning hole matching structure. The torque can be accurately adjusted by adjusting the above points. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in conjunction with the drawings and examples:

[0029] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0030] Figure 2 It is a schematic diagram of the structure of the shell and the inner sleeve in the present application.

[0031] Figure 3 It is a schematic diagram of the structure of the inner sleeve in the present application.

[0032] Figure 4 It is a schematic diagram of the structure of the driving block in the present application (upper part).

[0033] Figure 5 It is a schematic diagram of the structure of the driving block in the present application (lower part).

[0034] Figure 6 It is a schematic diagram of the structure of the driving block in the present application (middle part).

[0035] Figure 7 It is a sectional view of the driving block in the present application.

[0036] Figure 8 It is a partial sectional view of the present application.

[0037] Figure 9 Structure diagram of the adjusting wheel in the application.

[0038] Figure 10 Structure diagram of the bushing in the application.

[0039] Figure 11 Structure diagram of the drive shaft in the application.

[0040] Figure 12 Structure diagram of the product in the application.

[0041] Figure 13 Structure diagram of the product in the application.

[0042] Figure 14 Structure diagram of the floating claw in the application.

[0043] Figure 15 Structure diagram of the arc plate in the application (inner).

[0044] Figure 16 Structure diagram of the arc plate in the application (outer).

[0045] Figure 17 Structure diagram of the application (floating claw not drawn).

[0046] Figure 18 Cross-sectional view of Figure 17 .

[0047] In the figure: shell 1, inner sleeve 2, guide rail 3, floating claw 4, sliding block 5, driving block 6, product 7, driving mechanism 8, positioning column 9, product shell 7.1, product cover 7.2, steel belt 7.3, screw 7.4, positioning hole 7.5, high position section 3.1, low position section 3.2, inclined section 3.2, arc plate 4.1, roller 4.2, convex surface 4.3, driving block body 6.1, groove 6.2, threaded mounting hole 6.3, rotating shaft hole 6.4, rotating shaft positioning hole 6.5, transmission needle positioning hole 6.6, spring needle positioning hole 6.7, spring needle spring 6.8, positioning spring needle 6.9, adjusting wheel 8.1, adjusting positioning hole 8.1.1, wheel body 8.1.2, threaded sleeve 8.1.3, compression spring 8.2, bushing 8.3, transmission needle 8.4, drive shaft 8.5, shaft positioning hole 8.5.1, shaft stop ring 8.6, handle 8.7, screw tightening head 8.8. DETAILED DESCRIPTION

[0048] As shown in Figure 1 , an apparatus for controlling tightening torque includes a shell 1, an inner sleeve 2, a guide rail 3, a floating claw 4, a sliding block 5, a driving block 6, and a driving mechanism 8.

[0049] As Figures 2-3 shown, the inner sleeve 2 is a circular tube, the lower end of the inner sleeve 2 is provided with a special-shaped end face, and the upper end of the inner sleeve 2 is provided with a flange plate. The outer shell 1 is also a circular tube structure, the inner diameter of the upper part of the outer shell 1 is the same as the outer diameter of the inner sleeve 2, the inner diameter of the lower part of the outer shell 1 is the same as the inner diameter of the inner sleeve 2, and the lower part of the outer shell 1 is provided with a special-shaped end face at the inner side, which is the same as the lower end of the inner sleeve 2. When the inner sleeve 2 is placed in the outer shell 1 and tightened by bolts, the outer shell 1 and the inner sleeve 2 form a guide rail 3.

[0050] As Figures 2-3 shown, the guide rail 3 is an annular chute, the cross section of the annular chute is a horizontal U-shaped groove, and the annular chute includes left and right high sections 3.1 and front and rear low sections 3.2, which are smoothly connected by inclined sections 3.3. The high section 3.1 corresponds to the position of the steel belt 7.3 corresponding to the product 7, and the low section 3.2 and the inclined section 3.3 correspond to other parts of the product 7. In this way, the later floating clamping jaw 4 drives the product cover body 7.2 to rotate, and the floating clamping jaw 4 moves up when passing through the position where the steel belt 7.3 is located, thereby avoiding the steel belt 7.3.

[0051] As Figures 14-16 shown, the floating clamping jaw 4 is slidably arranged in the guide rail 3 and moves along the track of the guide rail 3. Specifically, the floating clamping jaw 4 includes a plurality of arc-shaped plates 4.1, and the upper part of each arc-shaped plate 4.1 has a "convex" structure. The plurality of arc-shaped plates 4.1 are sequentially spliced into an annular structure. The inner side of each arc-shaped plate 4.1 is provided with a sliding block 5, and the sliding block 5 of the floating clamping jaw 4 matches the groove 6.2 of the driving block 6, so that each arc-shaped plate 4.1 can move up and down relative to the driving block 6, and when the driving block 6 rotates in the circumferential direction, all the arc-shaped plates 4.1 rotate in the circumferential direction with the driving block 6. The outer side of the arc-shaped plate 4.1 is provided with a roller 4.2 at a suitable position, and the roller 4.2 is arranged in the guide rail 3 and moves up and down along the guide rail 3 when rotating in the circumferential direction. The inner side of the bottom end of each arc-shaped plate 4.1 is a convex surface 4.3, which matches the concave surface of the outer wall of the product cover body 7.2, so that the product cover body 7.2 can be clamped when the floating clamping jaw 4 moves down, and the product cover body 7.2 is driven to rotate when the floating clamping jaw 4 rotates.

[0052] To match the outer wall of the product cover body 7.2, so that the floating clamping jaw 4 can grasp the product cover body 7.2, and when the floating clamping jaw 4 rotates, the product cover body 7.2 rotates with it, and is locked on the outer shell 1.

[0053] As Figures 4-7As shown, the driving block 6 includes a driving block body 6.1, which is in the shape of a cylindrical structure as a whole. A groove 6.2 matching the slider 5 of the floating jaw 4 is arranged on the outer wall of the driving block body 6.1. A threaded mounting hole 6.3, a rotating shaft through hole 6.4 and a rotating shaft positioning hole 6.5 are sequentially arranged vertically in the center of the driving block body 6.1. The diameters of the threaded mounting hole 6.3 and the rotating shaft positioning hole 6.5 are greater than that of the rotating shaft through hole 6.4. An inner thread is arranged on the upper portion of the threaded mounting hole 6.3. An annular groove for positioning the shaft retaining ring 8.6 is arranged on the inner wall of the rotating shaft positioning hole 6.5. In addition, a plurality of transmission pin positioning holes 6.6 are arranged circumferentially on the driving block body 6.1 between the threaded mounting hole 6.3 and the rotating shaft positioning hole 6.5. The transmission pin positioning holes 6.6 are communicated with the threaded mounting hole 6.3 and the rotating shaft positioning hole 6.5.

[0054] As shown in the figure, Figure 8 The torque adjusting mechanism 8 includes an adjusting wheel 8.1. The adjusting wheel 8.1 includes a wheel body 8.1.2 on the upper portion. A plurality of adjusting positioning holes 8.1.1 are circumferentially distributed on the wheel body 8.1.2. A threaded sleeve 8.1.3 is integrally formed on the lower portion of the wheel body 8.1.2. The threaded sleeve 8.1.3 is used for threaded connection with the inner wall of the threaded mounting hole 6.3 of the driving block 6. A compression spring 8.2 is arranged on the lower end of the adjusting wheel 8.1. The compression spring 8.2 is sleeved on the bushing 8.3 and tightly presses the bushing 8.3 against the end face on the bottom end of the threaded mounting hole 6.3. A transmission pin 8.4 is inserted into each transmission pin positioning hole 6.6. The lower end of the transmission pin 8.4 passes through the transmission pin positioning hole 6.6 and enters the shaft positioning hole 8.5.1 of the driving shaft 8.5. The large head portion of the lower end of the driving shaft 8.5 is located in the rotating shaft positioning hole 6.5 and is limited by the shaft retaining ring 8.6. The upper end of the driving shaft 8.5 freely passes through the rotating shaft through hole 6.4, the bushing 8.3 and the adjusting wheel 8.1 and extends out. A handle 8.7 for operation is connected to the top end of the driving shaft 8.5.

[0055] Preferably, a plurality of elastic pin positioning holes 6.7 are vertically arranged on the inner circumferences of the driving block 6. An elastic pin spring 6.8 is arranged in each elastic pin positioning hole 6.7. A positioning elastic pin 6.9 is arranged above the elastic pin spring 6.8. The upper end of the positioning elastic pin 6.9 is inserted into the adjusting positioning hole 8.1.1 of the adjusting wheel 8.1.

[0056] As shown in the figure, Figure 8 The positioning elastic pin 6.9 is clamped into the corresponding hole position of the adjusting wheel 8.1 under the action of the lower elastic pin spring 6.8. The adjusting wheel 8.1 is locked. During the overall movement, the adjusting wheel 8.1 is prevented from changing the position relative to the connector, so that the torque is constant.

[0057] The torque control accuracy is determined by the following points: 1) the pitch of the threaded sleeve 8.1.3 of the adjusting wheel 8.1; 2) the spacing of the adjusting positioning holes 8.1.1 (seeFigure 9 ); 3) The elastic coefficient of the spring needle spring 6.8; 4) The design of the mating structure between the transmission needle 8.4 and the shaft positioning hole 8.5.1.

[0058] The principles in 1) and 2) are similar. The pitch is the compression of the torque spring (compression spring 8.2) by one revolution of the adjusting wheel 8.1. When the threaded sleeve 8.1.3 of the adjusting wheel 8.1 moves up or down by one pitch, the adjusting wheel 8.1 rotates one revolution. However, for greater precision, a ring of adjusting positioning holes 8.1.1 is set around the adjusting wheel 8.1. Since one revolution of the adjusting wheel 8.1 corresponds to one pitch movement, with four adjusting positioning holes 8.1.1, a quarter revolution moves the threaded sleeve 8.1.3 of the adjusting wheel 8.1 up or down by 1 / 4 pitch, meaning the compression adjustment precision is only 1 / 4 pitch. Similarly, with 40 adjusting positioning holes 8.1.1, the adjustment precision is 1 / 40 pitch. In other words, the more adjusting positioning holes 8.1.1 there are, the higher the precision. Of course, for greater clarity, torque markings can be made on the adjusting wheel 8.1 corresponding to each adjusting positioning hole 8.1.1, making it easier to check during adjustment.

[0059] To enable relative sliding between two parts, the shaft positioning hole 8.5.1 can only be a conical or hemispherical surface. According to the force analysis diagram below, separation can only occur when there is an inclination.

[0060] A method for controlling tightening torque includes the following steps:

[0061] Step 1) First, place the roller 4.2 (bearing) of the floating claw 4 inside the guide rail 3 formed by the outer shell 1 and the inner sleeve 2. Then fix the outer shell 1 and the inner sleeve 2 with bolts. In this way, the arc plate 4.1 of the floating claw 4 can run along the guide rail 3 when rotating, and thus move up and down. After passing the steel strip 7.3, the arc plate 4.1 at that point moves up and thus avoids the steel strip 7.3.

[0062] Step 2) The drive block 6 extends from bottom to top through the floating claw 4 and inner sleeve 2. At this time, the groove 6.2 of the drive block 6 matches the slider 5 of the floating claw 4. When the drive block 6 rotates, it can drive the floating claw 4 to rotate. At the same time, the arc plate 4.1 of the floating claw 4 can independently rise and fall during rotation. See Figure 6 The drive block 6 has a larger diameter at the lower end and a smaller diameter at the upper end, and an annular groove is provided on the upper part of the drive block 6. After the drive block 6 extends out of the inner sleeve 2, a shaft retaining ring (GB894) is fitted into the annular groove on the upper part of the drive block 6, and the drive block 6 is restricted from moving downward by the shaft retaining ring 8.6. After installation, the drive block 6 can only rotate circumferentially and cannot move up and down.

[0063] Step 3), a plurality of elastic needle positioning holes 6.7 are arranged on the periphery of the driving block 6, and an elastic needle spring 6.8 and a positioning elastic needle 6.9 are arranged in the elastic needle positioning holes 6.7. A driving shaft 8.5 is inserted into the center of the driving block 6, and the large end of the driving shaft 8.5 is limited by the shaft stop ring 8.6 in the shaft positioning hole 6.5 in the bottom end of the driving block 6. The upper end of the driving shaft 8.5 freely passes through the shaft hole 6.4, the bushing 8.3, and the adjusting wheel 8.1 in sequence and then extends out. In the later stage, a handle 8.7 for operation can be connected to the top end of the driving shaft 8.5. The handle 8.7 can be manually or mechanically rotated to drive the driving shaft 8.5 to rotate.

[0064] Step 4), a transmission needle 8.4 is inserted into the transmission needle positioning hole 6.6, and the lower end of the transmission needle 8.4 falls into the shaft positioning hole 8.5.1 on the large end of the driving shaft 8.5. The bushing 8.3 is sleeved on the driving shaft 8.5 and falls on the bottom surface in the threaded mounting hole 6.3. The compression spring 8.2 is further sleeved on the bushing 8.3, and then the adjusting wheel 8.1 is threaded and connected with the threaded mounting hole 6.3 of the driving block 6 after passing through the driving shaft 8.5. The threaded sleeve 8.1.3 at the lower end of the adjusting wheel 8.1 presses the compression spring 8.2 downward, so that the bushing 8.3 tightly presses the transmission needle 8.4 on the driving shaft 8.5.

[0065] Step 5), since the wheel body 8.1.2 of the adjusting wheel 8.1 is provided with a plurality of adjusting positioning holes 8.1.1 on the lower end surface in the circumference, after the adjusting wheel 8.1 is installed, the positioning elastic needle 6.9 is clamped with the adjusting positioning hole 8.1.1.

[0066] Step 6), when it is necessary to drive the product cover body 7.2 to rotate, the four positioning columns 9 of the device are inserted into the positioning holes 7.5 of the product 7, so that the relative position between the device and the product 7 remains unchanged. At this time, the arc-shaped plates 4.1 of the floating clamping jaw 4 are located in the high position section 3.1 of the guide rail 3 at the steel belt 7.3, so that the arc-shaped plates 4.1 at this position are moved upward to avoid the steel belt 7.3. The arc-shaped plates 4.1 at other positions of the floating clamping jaw 4 are in cooperation with the product cover body 7.2 to tightly clamp.

[0067] Step 7), the handle 8.7 is rotated, and the driving shaft 8.5 is rotated accordingly. Since the driving shaft 8.5 is clamped with the driving block 6 through the transmission needle 8.4, when the driving shaft 8.5 is rotated, the driving shaft 8.5 drives the driving block 6 to rotate. The rotation of the driving block 6 drives the floating clamping jaw 4 to rotate, and the rotation of the floating clamping jaw 4 drives the product cover body 7.2 to rotate, thereby tightening the product cover body 7.2 on the product shell 7.1.

[0068] Step 8), during the rotation of the driving shaft 8.5, because the high section 3.1 of the device is always corresponding to the steel belt 7.3, when the arc plate 4.1 of the floating jaw 4 runs to the high section 3.1 on the guide rail 3, the arc plate 4.1 will move up and automatically avoid the steel belt 7.3, so as to ensure that the driving shaft 8.5 of the device can be directly driven to rotate circumferentially without any obstacles whether by artificial or mechanical means.

[0069] Step 9), when the torque needs to be increased, the wheel body 8.1.2 of the adjusting wheel 8.1 (providing a groove circumferentially for easy rotation) can be rotated to move the adjusting wheel 8.1 downward by a distance, so that the elastic force of the compression spring 8.2 increases, and the force required to lift the transmission needle 8.4 upward also increases. That is, the driving shaft 8.5 needs to provide a larger torque to make the transmission needle 8.4 disengage from the driving shaft 8.5. Because when the driving shaft 8.5 and the transmission needle 8.4 are not disengaged, the driving shaft 8.5 can drive the driving block 6 and the floating jaw 4 to rotate through the transmission needle 8.4, and then tighten the product cover 7.2. When the driving shaft 8.5 and the transmission needle 8.4 are disengaged, the driving shaft 8.5 will not drive the driving block 6 and the floating jaw 4 to rotate.

[0070] In this way, when the adjusting wheel 8.1 is rotated to increase the torque of the driving shaft 8.5, the tightening torque for tightening the product cover 7.2 can be increased, so that the product cover 7.2 can be tightened more tightly; when the adjusting wheel 8.1 is reversely rotated to increase the torque of the driving shaft 8.5, the tightening torque for tightening the product cover 7.2 can be reduced.

Claims

1. A device for controlling tightening torque, characterized by: The utility model relates to a floating clamp jaw driving mechanism, including shell (1), inner cover (2), shell (1), inner cover (2) form guide rail (3), floating clamp jaw (4) outside slide in guide rail (3) inside and move along the track of guide rail (3) with, floating clamp jaw (4) inside circumferential along length direction is equipped with a plurality of slider (5), floating clamp jaw (4) is through slider (5) with drive block (6) sliding fit, floating clamp jaw (4) lower end is connected with product (7), drive block (6) drives floating clamp jaw (4) rotation, product (7) is screwed up, The drive block (6) is driven by the adjustable torque driving mechanism (8). The guide rail (3) is a ring-shaped sliding slot, which includes left and right high sections (3.1) and front and rear low sections (3.2). The high sections (3.1) and the low sections (3.2) are smoothly connected through inclined sections (3.3). The floating clamp jaw (4) includes a plurality of arc-shaped plates (4.1), which are connected in a ring-shaped structure. The inner side of each arc-shaped plate (4.1) is provided with a slider (5), and the outer side of each arc-shaped plate (4.1) is provided with a roller (4.2) at the same height through a pin shaft. The inner side of the bottom end of each arc-shaped plate (4.1) is a convex surface (4.3). The high sections (3.1) correspond to the positions of the steel belts (7.3) corresponding to the product (7). The low sections (3.2) and the inclined sections (3.3) correspond to other parts of the product (7). When the floating clamp jaw (4) drives the product cover body (7.2) to rotate, the floating clamp jaw (4) will move up when passing through the position of the steel belt (7.3), thereby avoiding the steel belt (7.3).

2. A device for controlling the tightening torque according to claim 1, characterized in that: The drive block (6) includes a drive block body (6.1), which is provided with a groove (6.2) matched with the slider (5) on the outer wall. A threaded mounting hole (6.3), a shaft through hole (6.4), and a shaft positioning hole (6.5) are sequentially arranged vertically in the center of the drive block body (6.1) from top to bottom. A plurality of transmission needle positioning holes (6.6) are arranged circumferentially on the drive block body (6.1) between the threaded mounting hole (6.3) and the shaft positioning hole (6.5). The transmission needle positioning holes (6.6) are connected with the threaded mounting hole (6.3) and the shaft positioning hole (6.5).

3. A device for controlling the tightening torque according to claim 2, characterized in that: The torque adjusting mechanism (8) includes an adjusting wheel (8.1), which is threadedly connected with the inner wall of the threaded mounting hole (6.3) on the outer side. A compression spring (8.2) is arranged at the lower end of the adjusting wheel (8.1). A bushing (8.3) is arranged at the lower end of the compression spring (8.2). The bushing (8.3) tightly presses the transmission needle (8.4) in the drive block (6) into the shaft positioning hole (8.5.1) of the drive shaft (8.5). The large end of the drive shaft (8.5) is arranged in the shaft positioning hole (6.5) and is limited by the shaft stop ring (8.6). The upper end of the drive shaft (8.5) freely passes through the shaft through hole (6.4), the bushing (8.3), and the adjusting wheel (8.1) and then extends out.

4. A device for controlling the tightening torque according to claim 3, characterized in that: The driving block (6) is vertically provided with a spring needle positioning hole (6.7) in the inner periphery, a spring needle spring (6.8) is mounted in the spring needle positioning hole (6.7), a positioning spring needle (6.9) is arranged above the spring needle spring (6.8), and the upper end of the positioning spring needle (6.9) is inserted into an adjusting positioning hole (8.1.1) of an adjusting wheel (8.1).

5. A device for controlling the tightening torque according to claim 4, characterized in that: The adjusting positioning hole (8.1.1) is in multiple groups and is uniformly and spacedly distributed at the bottom of the adjusting wheel (8.1).

6. The method for installing product covers by using the device for controlling tightening torque according to claim 5, comprising the following steps: Step 1), firstly, the roller (4.2) of the floating jaw (4) is arranged in the guide rail (3) formed by the outer shell (1) and the inner sleeve (2), and then the outer shell (1) and the inner sleeve (2) are fixed by bolts, so that the arc-shaped plate (4.1) of the floating jaw (4) can run along the guide rail (3) and then be lifted up and down when being rotated, and after passing through the steel belt (7.3), the arc-shaped plate (4.1) at this position is lifted up and then avoids the steel belt (7.3); Step 2), the driving block (6) is inserted from the bottom to the top of the floating jaw (4) and the inner sleeve (2) and then is extended, at this time, the groove (6.2) of the driving block (6) is matched with the sliding block (5) of the floating jaw (4), the floating jaw (4) can be rotated when the driving block (6) is rotated, and the arc-shaped plate (4.1) of the floating jaw (4) can be independently lifted up and down when being rotated; the lower end of the driving block (6) has a large diameter, the upper end of the driving block (6) has a small diameter, and the upper part of the driving block (6) is provided with an annular groove; After the driving block (6) is extended out of the inner sleeve (2), the shaft stop ring is arranged in the annular groove of the upper part of the driving block (6), and the driving block (6) is limited to move downward by the shaft stop ring (8.6); after being installed, the driving block (6) can only be rotated in the circumferential direction and cannot be moved up and down; Step 3), the spring needle spring (6.8) and the positioning spring needle (6.9) are arranged in the plurality of spring needle positioning holes (6.7) in the circumferential direction of the driving block (6); the driving shaft (8.5) is inserted into the center of the driving block (6), the lower end of the driving shaft (8.5) is limited by the shaft stop ring (8.6) in the driving block (6) bottom end rotating shaft positioning hole (6.5); the upper end of the driving shaft (8.5) is sequentially and freely inserted through the rotating shaft perforation (6.4), the bushing (8.3) and the adjusting wheel (8.1) and then is extended; the handle (8.7) for operation can be connected to the top end of the driving shaft (8.5) in the later period; the handle (8.7) can be manually or mechanically rotated to drive the driving shaft (8.5) to rotate. Step 4, insert the driving needle (8.4) into the driving needle positioning hole (6.6), the lower end of the driving needle (8.4) falls into the shaft positioning hole (8.5.1) on the large end of the driving shaft (8.5); the bushing (8.3) is sleeved on the driving shaft (8.5), and the bushing (8.3) falls into the bottom of the threaded mounting hole (6.3); the compression spring (8.2) is further sleeved on the bushing (8.3), and then the adjusting wheel (8.1) is threaded through the driving shaft (8.5) and connected with the threaded mounting hole (6.3) of the driving block (6); the threaded sleeve (8.1.3) at the lower end of the adjusting wheel (8.1) presses the compression spring (8.2) downward, so that the bushing (8.3) tightly presses the driving needle (8.4) on the driving shaft (8.5); Step 5, because the lower end of the wheel body (8.1.2) of the adjusting wheel (8.1) is provided with a plurality of adjusting positioning holes (8.1.1) in the circumferential direction, after the adjusting wheel (8.1) is installed, the positioning needle (6.9) is connected with the adjusting positioning hole (8.1.1); Step 6, when the product cover (7.2) needs to be driven to rotate, the four positioning columns (9) of the device are inserted into the positioning holes (7.5) of the product (7), so that the relative position between the device and the product (7) remains unchanged; At this time, the arc-shaped plates (4.1) of the floating clamping jaw (4) are in the high position section (3.1) of the guide rail (3) at the steel belt (7.3), so that the arc-shaped plates (4.1) at this position are moved upward to avoid the steel belt (7.3); The arc-shaped plates (4.1) at other positions of the floating clamping jaw (4) cooperate with the product cover (7.2) to tightly grasp; Step 7, rotate the handle (8.7), the driving shaft (8.5) rotates, because the driving shaft (8.5) and the driving block (6) are connected through the driving needle (8.4), when the driving shaft (8.5) rotates, the driving shaft (8.5) drives the driving block (6) to rotate; The rotation of the driving block (6) can drive the floating clamping jaw (4) to rotate, and the rotation of the floating clamping jaw (4) can drive the product cover (7.2) to rotate, thereby tightening the product cover (7.2) on the product shell (7.1); Step 8, during the rotation of the driving shaft (8.5), because the high position section (3.1) of the device always corresponds to the steel belt (7.3), when the arc-shaped plates (4.1) of the floating clamping jaw (4) run to the high position section (3.1) on the guide rail (3), the arc-shaped plates (4.1) will move upward and automatically avoid the steel belt (7.3), so that whether manual or mechanical means can directly drive the driving shaft (8.5) of the device to rotate without any obstacles. Step 9), when the torque needs to be increased, the wheel body (8.1.2) of the adjusting wheel (8.1) can be rotated to move the adjusting wheel (8.1) downward by a distance, so that the elastic force of the compression spring (8.2) increases, the driving needle (8.4) is separated from the shaft positioning hole (8.5.1) of the drive shaft (8.5), and the required upward lifting force of the driving needle (8.4) also increases; that is, the drive shaft (8.5) needs to provide a larger torque to make the driving needle (8.4) separate from the drive shaft (8.5); because when the drive shaft (8.5) and the driving needle (8.4) are not separated, the drive shaft (8.5) can drive the driving block (6) and the floating clamping jaw (4) to rotate through the driving needle (8.4), and then tighten the product cover body (7.2); when the drive shaft (8.5) and the driving needle (8.4) are separated, the drive shaft (8.5) will not drive the driving block (6) and the floating clamping jaw (4) to rotate; In this way, when the adjusting wheel (8.1) is rotated to increase the torque of the drive shaft (8.5), the tightening torque for tightening the product cover body (7.2) can be increased, so that the product cover body (7.2) is tightened more tightly; when the adjusting wheel (8.1) is reversely rotated to reduce the torque of the drive shaft (8.5), the tightening torque for tightening the product cover body (7.2) can be reduced.

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