An assembly tool for installing a mainspring into a screw-down mechanism

Abstract

The present invention provides an assembly method for installing a mainspring into a screw-off mechanism, which solves the problem that the mainspring is difficult to install in a natural state during the assembly process of the screw-off mechanism, and the mainspring is easy to injure the operator during the assembly process due to the large torque of the spring-off. The method includes the following contents: tightening the mainspring with a mainspring tightening tool, the tool including a swivel, a mainspring fixing pin, a bracket, a pawl, a ratchet, and a spring limiting pin; firstly, the semicircular arc portion of the mainspring is sleeved on the spring limiting pin, and the other end is inserted into the preset groove of the mainspring fixing pin, and at the same time, the mainspring fixing safety pin is inserted into the connecting hole of the mainspring and the mainspring fixing pin; rotating the swivel, when the maximum outer diameter of the mainspring winding is smaller than the inner diameter of the sleeve, the sleeve is sleeved into the mainspring, the pawl is pulled outward, and the mainspring is tightened in the sleeve under the action of the rebound force, and the sleeve is removed together with the mainspring; finally, the sleeve and the mainspring are installed on the rotating mechanism. The assembly of the screw-off mechanism is completed with a special tool.

Description

Technical Field

[0001] The invention belongs to the technical field of unscrewing mechanism assembly process, and in particular relates to an assembly tool for assembling a mainspring into an unscrewing mechanism. Background Art

[0002] The unscrewing mechanism is widely used. Its function is to realize the relative movement between the unscrewing mechanism seat and the base through the two states of tightening and releasing the spring, so as to realize the detection function of the photoelectric system. The spring is a steel strip with a width of 13mm, a thickness of 1.5mm, and a length of 760mm. After heat treatment, it is wound into a spring. After strong pressure, the number of turns of the spring in the free state is 2.5 to 3 turns, and the outer diameter is about 115mm. Figure 1 It is required to install the spring into the hole of the φ77 of the unscrewing mechanism seat, fix the two ends of the spring at a certain position, and the installed spring is required to be at the 4.35-turn position in the initial state, as shown in the figure. Figure 2 After installation, turn the unscrew mechanism seat 180°, tighten the mainspring to 4.85 turns, as shown in the figure below. Figure 3 Loosen the unscrewing mechanism seat and use the power of the spring to rotate (the initial torque of the spring rotation is greater than or equal to 7.2N·m, which is qualified) to make the unscrewing mechanism seat freely rotate back to the initial state, that is, the position of 4.35 turns of the spring. At this time, the whole assembly process is qualified.

[0003] During the assembly of the unscrewing mechanism, the spring is difficult to install in its natural state due to the small available space for assembly. The spring's spring-opening torque is large and the operator may be easily injured during the assembly process. Therefore, special tooling must be used to complete the assembly of the unscrewing mechanism. Summary of the invention

[0004] During the assembly of the unscrewing mechanism, the available space for assembly is relatively small, and the mainspring is difficult to install in its natural state. In addition, due to the large torque of the mainspring's spring-opening, the operator is easily injured during the assembly process. The tooling is designed to complete the assembly of the unscrewing mechanism:

[0005] First, the sleeve for tightening the spring is designed. Through repeated tests and calculations, the dimensions of each part of the spring sleeve are determined, especially the inner diameter φ61. If it is larger or smaller than 61, the spring cannot be installed in place. Its size value determines the assembly position of the two ends of the spring, such as Figure 4 shown.

[0006] How to tighten the spring in the sleeve and make the extended end exposed outside the sleeve for assembly. First of all, consider that during the process of winding, one end of the spring is fixed, and the outer diameter gradually decreases, from 115mm to less than 61mm. Only then can the sleeve tighten the spring. If you simply use the assembly platform, fix the shaft, fix one end of the spring on the locating pin of the shaft, fix it with two support rods and a crossbeam, and put the sleeve into a support rod first. During the process of winding the spring, you must hold the sleeve with your hand, and use the other end of the spring (the extended part) to clamp it in the countersunk hole of the support rod. While turning the crossbeam, hold the sleeve and the spring, and you can also tighten the spring in the sleeve, but two people must cooperate. If the cooperation is not tacit, it will cause the spring to rotate unsafely if you are not careful. Considering these, the principle of ratchet and pawl is used to design the tightening spring tooling.

[0007] In order to solve the above problems, the present invention provides an assembly tool for installing a mainspring into a screw-open mechanism, which can complete the assembly of the screw-open mechanism conveniently and efficiently.

[0008] The technical solution adopted by the present invention is: an assembly method for installing a mainspring into a screw-off mechanism, characterized in that the method includes the following contents: using the following mainspring tightening tool: including a swivel, a mainspring fixing pin, a bracket, a pawl, a ratchet, and a spring limiting pin; the spring limiting pin is a circular structure, axially installed near the middle position of the ratchet, the ratchet is fixed on the bracket, the pawl is embedded in the rear inner end of the swivel and connected with the ratchet, and the swivel has a radial hole for installing the swivel positioning pin; the mainspring fixing pin is a cylindrical structure, installed in the radial hole of the swivel, and a fixing pin is opened in the middle of the mainspring fixing pin. A preset groove of a fixed spring is provided, and a hole is provided on the inner end of a spring fixing pin; the spring is tightened by using a spring tightening tool, firstly the semicircular arc portion of the spring is sleeved on the spring limiting pin, and the other end is inserted into the preset groove of the spring fixing pin, and at the same time, a spring fixing safety pin is inserted into the connecting hole of the spring and the spring fixing pin; the swivel is rotated, and when the maximum outer diameter of the spring winding is smaller than the inner diameter of the sleeve, the sleeve is sleeved into the spring, and the ratchet is pulled outward, and the spring is tightened in the sleeve under the action of the rebound force, and the sleeve is removed together with the spring; finally, the sleeve and the spring are installed on the rotating mechanism.

[0009] The technical effect of the present invention is to solve the problem that during the assembly process of the unscrewing mechanism, the mainspring is difficult to be installed in a natural state, and the operator is easily injured during the assembly process due to the large torque of the mainspring rebounding, and the assembly of the unscrewing mechanism is completed by using special tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] There are 5 drawings in total in the specification of the present invention.

[0011] Figure 1 is a schematic diagram of the shape and size of the spring; a is a main view of the spring, b is a schematic diagram of the structure of the two ends of the spring, and C is a schematic diagram of the strip material of the spring before processing;

[0012] Figure 2 This is a schematic diagram of the tightened state of the mainspring after the mainspring is installed in the unscrewing mechanism;

[0013] Figure 3 It is a schematic diagram of the unwinding state of the mainspring after the mainspring is installed in the unwinding mechanism;

[0014] Figure 4 It is a schematic diagram of a sleeve for tightening the mainspring of the present invention;

[0015] Figure 5 It is a schematic diagram of the tooling for tightening the mainspring of the present invention.

[0016] Figure 6 The figure is a top view of the tooling for tightening the mainspring of the present invention.

[0017] 1 sleeve 2 carriage 3 swivel 4 spring fixing safety pin 5 spring fixing pin 6 swivel positioning pin 7 bolt 8 bolt 9 nut 10 gasket 11 bracket 12 spring 13 nut 14 pawl 15 ratchet 16 spring limiting pin 17 pawl handle 18 handle 19 assembly platform, 20 positioning cylinder A-material tying direction DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings.

[0019] An assembly tool for installing a mainspring into a screw-off mechanism, comprising a sleeve 1, a swivel 3, a mainspring fixing safety pin 4, a mainspring fixing pin 5, a swivel positioning pin 6, a bracket 11, a pawl 14, a ratchet 15, and a spring limiting pin 16; the spring limiting pin 16 is a circular structure, axially installed near the middle position of the ratchet 15, the ratchet 15 is fixed on the bracket 11, the pawl 14 is embedded in the rear inner end of the swivel 3 and connected to the ratchet, and the swivel 3 is provided with a radial hole for installing the swivel positioning pin 6; the mainspring fixing pin 5 is a cylindrical structure, installed in the radial hole of the swivel 3, a preset groove for fixing the mainspring is opened in the middle of the mainspring fixing pin, and the mainspring fixing safety pin 4 passes through the holes on the mainspring and the mainspring fixing pin 5 when assembled.

[0020] Furthermore, the swivel positioning pin 6 is limitedly passed through the radial hole of the swivel 3 and extends into the bottom of the bracket to axially limit the swivel.

[0021] Furthermore, the pawl 14 passes through the inner end of the radial hole of the swivel 3 and is connected to the ratchet wheel.

[0022] Furthermore, the upper end of the rotating body 3 has a cylindrical cavity for placing the mainspring.

[0023] Furthermore, the sleeve is a cylindrical structure, and one side of the cylinder wall is provided with an opening for extending the end of the mainspring.

[0024] Furthermore, the sleeve is used to accommodate the tightened mainspring.

[0025] Furthermore, the outer side of the sleeve is provided with a drag plate for positioning the sleeve.

[0026] Furthermore, the handle 18 is connected to the swivel.

[0027] Furthermore, the outer end of the pawl has a pawl handle.

[0028] Furthermore, a nut and a spring are provided in the hole on the rotating body where the pawl 14 is located; two ends of the spring are respectively pressed against the structural nut and the front end of the pawl 14 .

[0029] A method for assembling a mainspring into a screw-off mechanism, the method comprising the following contents: using the following mainspring tightening tool: comprising a swivel 3, a mainspring fixing pin 5, a bracket 11, a pawl 14, a ratchet 15, and a spring limiting pin 16; the spring limiting pin 16 is a circular structure, axially mounted near the middle of the ratchet 15, the ratchet 15 is fixed on the bracket 11, the pawl 14 is embedded in the rear inner end of the swivel 3 and connected to the ratchet, the swivel 3 has a radial hole for mounting a swivel positioning pin 6; the mainspring fixing pin 5 is a cylindrical structure, mounted in the radial hole of the swivel 3, and a fixing pin 6 is opened in the middle of the mainspring fixing pin The spring has a preset groove, and a hole is provided on the inner end of the spring fixing pin 5; the spring is tightened by using a spring tightening tool, firstly the semicircular arc portion of the spring is sleeved on the spring limiting pin 16, and the other end is inserted into the preset groove of the spring fixing pin 5, and at the same time, the spring fixing safety pin 4 is inserted into the connecting hole of the spring and the spring fixing pin; the rotating body 3 is rotated, and when the maximum outer diameter of the spring winding is smaller than the inner diameter of the sleeve, the sleeve 1 is sleeved into the spring, and the ratchet pawl (14) is pulled outward, and the spring is tightened in the sleeve under the action of the rebound force, and the sleeve is removed together with the spring; finally, the sleeve and the spring are installed on the rotating mechanism.

[0030] Furthermore, the specific contents of installing the sleeve and the mainspring in the rotating mechanism are as follows: the relative positions of the rotating shaft and the unscrewing mechanism seat are adjusted, and after the mainspring and the sleeve are installed into the hole of the unscrewing mechanism seat, one end of the mainspring with a semicircular arc is sleeved on the positioning pin of the rotating shaft, one end of the mainspring is fixed, and the protruding part of the other end is placed in the side groove of the unscrewing mechanism seat, and one end of the mainspring is fixed to the unscrewing mechanism seat with a fixing screw; the unscrewing mechanism seat is fixed on the assembly platform with a rotating shaft, the unscrewing mechanism seat is rotated to tighten the mainspring, and the unscrewing mechanism seat is loosened after the sleeve is withdrawn, and when the mainspring reaches a determined position, the unscrewing mechanism seat is fixed.

[0031] like Figure 5 As shown, an assembly tool for installing a mainspring into a screw-opening mechanism of the present invention comprises a sleeve 1, a swivel 3, a mainspring fixing safety pin 4, a mainspring fixing pin 5, a swivel positioning pin 6, a bracket 11, a pawl 14, a ratchet 15, a spring limiting pin 16, etc.

[0032] The spring limiting pin 16 is a circular structure and is axially installed near the middle position of the ratchet 15. The ratchet 15 is fixed on the bracket 11. The pawl 14 is embedded in the swivel 3 (through the radial hole of the swivel 3) and is connected to the ratchet at the same time (inner end). The (swivel 3) is limited by the swivel positioning pin 6. The spring fixing pin 5 is a movable part with a cylindrical structure and is installed at the radial side hole of the swivel 3. A preset groove for fixing the spring is opened in the middle. The spring fixing safety pin 4 is installed on the spring fixing pin 5 during assembly.

[0033] The spring 12 is sleeved on the outer periphery of the pawl and is limited by the nut 13 .

[0034] When the spring is tightened, the semicircular arc part of the spring is first sleeved on the spring limiting pin (spring limiting pin) 16, and the other end is inserted into the preset groove of the spring fixing pin 5, and the spring fixing safety pin 4 is inserted into the connecting hole of the spring and the spring fixing pin.

[0035] In order to avoid damage to parts or scratching the operator when the mainspring rotates, a ratchet and a pawl are used. The main structural principle is that the ratchet 15 is fixed on the bracket 11, and the movable pawl 14 is embedded in the swivel 3 and connected to the ratchet at the same time, and is limited by the swivel positioning pin 6.

[0036] At this time, the handle 18 is used to rotate the swivel 3. When the maximum outer diameter of the winding of the mainspring is smaller than the inner diameter of the sleeve, the sleeve 1 is inserted into the mainspring. At this time, the pawl 14 is pulled outward, and the mainspring is tightened in the sleeve under the action of the rebound force, and the sleeve is removed together with the mainspring.

[0037] The characteristic of the tooling is that the ratchet is contained in the swivel, the pawl always locks the ratchet by the power of the spring, the spring fixing pin can slide freely in the hole of the swivel, and can move freely when the spring is wound from large to small. At the same time, the upper plane of the ratchet can ensure the shape of the spring during winding without damaging the surface of the spring.

[0038] The process of installing the mainspring into the rotating mechanism is:

[0039] First tighten the spring in the sleeve, and install it together with the sleeve into the hole of the unscrewing mechanism seat (at this time, the relative position of the shaft and the unscrewing mechanism seat has been adjusted). The end of the spring with a semicircular arc is sleeved on the positioning pin of the shaft. One end of the spring is fixed, and the other end (the protruding part) is placed in the side groove of the unscrewing mechanism seat. The end of the spring with a φ4 hole is fixed to the unscrewing mechanism seat with a fixing screw, so that both ends of the spring are fixed at the same time. Use the shaft to fix the unscrewing mechanism seat on the assembly platform. At this time, the shaft is fixed and the unscrewing mechanism seat can rotate relative to the shaft and the assembly platform. By rotating the unscrewing mechanism seat, tighten the spring, withdraw the sleeve, and slowly loosen the unscrewing mechanism seat. When the spring reaches the 4.35-turn position, fix the unscrewing mechanism seat with the positioning pin.

Claims

1. A method for assembling a mainspring into a screw-down mechanism, characterized in that: The method includes the following: The following spring tightening tool is used: comprising a swivel (3), a spring fixing pin (5), a bracket (11), a pawl (14), a ratchet (15), and a spring limiting pin (16); the spring limiting pin (16) is a circular structure, axially mounted near the middle position of the ratchet (15), the ratchet (15) is fixed on the bracket (11), the pawl (14) is embedded in the rear inner end of the swivel (3) and connected to the ratchet, and the swivel (3) is provided with a radial hole for installing a swivel positioning pin (6); the spring fixing pin (5) is a cylindrical structure, mounted in the radial hole of the swivel (3), a preset groove for fixing the spring is opened in the middle of the spring fixing pin, and a hole is provided on the inner end of the spring fixing pin (5); The spring is tightened by using a spring tightening tool. First, the semicircular arc portion of the spring is sleeved on the spring limiting pin (16), and the other end is inserted into the preset groove of the spring fixing pin (5). At the same time, the spring fixing safety pin (4) is inserted into the connecting hole of the spring and the spring fixing pin; the rotating body (3) is rotated, and when the maximum outer diameter of the spring winding is smaller than the inner diameter of the sleeve, the sleeve (1) is sleeved into the spring, and the ratchet (14) is pulled outward. The spring is tightened in the sleeve under the action of the rebound force, and the sleeve is removed together with the spring; Finally, the sleeve and mainspring are mounted on the rotating mechanism.

2. A method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The specific contents of installing the sleeve and the mainspring in the rotating mechanism are: After the relative positions of the rotating shaft and the unscrewing mechanism seat are adjusted, and the mainspring is installed into the hole of the unscrewing mechanism seat together with the sleeve, the end of the mainspring with the semicircular arc is sleeved on the positioning pin of the rotating shaft, one end of the mainspring is fixed, and the protruding part of the other end is placed in the side groove of the unscrewing mechanism seat, and the other end of the mainspring is fixed to the unscrewing mechanism seat with a fixing screw; the unscrewing mechanism seat is fixed on the assembly platform with the rotating shaft, the unscrewing mechanism seat is rotated to tighten the mainspring, and the unscrewing mechanism seat is loosened after the sleeve is withdrawn, and when the mainspring reaches a determined position, the unscrewing mechanism seat is fixed.

3. A method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The sleeve is a cylindrical structure, and one side of the cylinder wall is provided with an opening for extending the end of the mainspring.

4. A method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The outer side of the sleeve is provided with a drag plate for positioning the sleeve.

5. The method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The swivel positioning pin limiter passes through the swivel positioning pin radial hole and extends into the bottom of the bracket to axially limit the swivel.

6. A method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The pawl passes through the inner end of the radial hole of the swivel and is connected with the ratchet wheel.

7. A method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The upper end of the rotating body (3) is provided with a cylindrical cavity for placing the clockwork spring.

8. The method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The handle is connected to the swivel.

9. The method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: A nut and a spring are arranged in a hole on the rotating body where the ratchet is located; two ends of the spring are respectively pressed against the nut and the front end of the ratchet.

10. The method for assembling a mainspring into a screw-down mechanism according to claim 1, characterized in that: The outer end of the pawl has a pawl handle.

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