Coil spring automatic assembly device and method

Abstract

The present invention relates to an automatic assembly device and method for a coil spring, which is used to assemble a pre-assembled component in which the inner end of a coil spring is fixed relative to a base, and the outer end of the coil spring is assembled in a docking slot of the base in an energy storage state, and the outer end of the coil spring is blocked by rotating the base, so that the outer end of the coil spring is twisted relative to the base. Compared with rotating the coil spring to fix the base, the present invention is easy to operate and reduces the design cost. The installation process of the outer end of the coil spring can be automatically realized by using an automatic assembly device for coil springs, which greatly improves production efficiency. At the same time, the non-manual operation method improves safety and has great promotion value.

Description

Technical Field

[0001] The invention relates to an automatic assembly device, in particular to an automatic coil spring assembly device and a method thereof. Background Art

[0002] Plane scroll spring( Figure 1 ) is usually wound in the form of a spiral scroll into a disc shape, so it is also called a coil spring. To date, the installation of coil springs is still often achieved using traditional tools and methods, such as Figure 2-3 The structure diagram of a coil spring applied to a rotating bracket of an isolating switch is shown. The rotating bracket is used to manually drive the isolating switch to open or close, and includes a base frame 1 composed of a rotating shaft 11 and a cantilever 12, and also includes a coil spring 2 and a cam 3. The coil spring 2 is rotatably sleeved on the rotating shaft 11, and the cam 3 is connected to the rotating shaft 11 and rotates synchronously with the rotating shaft 11. The inner end 22 of the coil spring 2 is inserted into the cam 3, and the cam 3 is used to limit the rotation of the inner end 22 of the coil spring 2, so that the inner end 22 of the coil spring 2 is fixed relative to the base frame 1. The outer end 21 of the coil spring 2 is a curved U-shaped hook structure, and the cantilever 12 is provided with a docking slot 121 that is engaged with the outer end 21 of the coil spring 2. After the pre-assembly of the base frame 1, the coil spring 2 and the cam 3 is completed, the base frame 1 is first fixed with a clamp, and then the outer end 21 of the coil spring 2 is manually pressed with a tool (such as a screwdriver) to rotate relative to the base frame 1. At the same time, brute force is used to press the outer end 21 downward so that it passes over the outer edge of the docking slot 121 so that it is elastically clamped in the docking slot 121. After the coil spring 2 is assembled, the base frame 1 and the cam 3 are clamped and fixed together by the elastic force of the coil spring 2.

[0003] This traditional installation method is not only time-consuming and labor-intensive, but also inefficient and, more importantly, unsafe. Since the elastic coefficient of the coil spring is high and the force-bearing area of ​​the outer end 21 is small, workers can only use tools such as screwdrivers to press down the outer end 21, which is inconvenient. In addition, workers need to accurately apply a large pressure to the outer end 21 of the coil spring during operation. If the external force is removed or slips due to insufficient strength or inaccurate force application position when pressing down the outer end 21, it is easy to cause the coil spring 2 and the cam 3 to bounce, collapse, and other unfavorable situations. Summary of the invention

[0004] Therefore, in order to solve the above problems, the present invention proposes a coil spring automatic assembly device and method with optimized structure.

[0005] The present invention is implemented by the following technical solutions:

[0006] The present invention proposes an automatic coil spring assembly device, which is used to assemble a preassembled component in which the inner end of the coil spring is fixed relative to a base, and the outer end of the coil spring is assembled in a docking slot of the base in an energy-storing state. The device comprises a positioning seat, a rotating mechanism, a stopper and a pressing mechanism. The positioning seat is used to carry and position the preassembled component, the rotating mechanism is used to drive the base to rotate, and the stopper is used to block the outer end of the coil spring when the rotating mechanism drives the base to rotate. After the outer end of the coil spring is twisted relative to the base to store energy, and when the outer end of the coil spring moves relatively to the docking slot adjacent to the base, the outer end of the coil spring is pressed radially inwardly by the pressing mechanism, so that the outer end of the coil spring is separated from the blockage of the stopper and is clamped into the docking slot of the base by the elastic force of the coil spring to complete the assembly.

[0007] Among them, the preassembled component also includes a mating piece that is sleeved on the base and forms a circumferential limiting relationship with the base. The disc spring can be rotatably sleeved on the base, and the inner end of the disc spring is inserted and mated on the mating piece so that the inner end of the disc spring and the base are relatively fixed. When the outer end of the disc spring is clamped in the slot, the elastic force of the disc spring fixes the mating piece, the disc spring and the base as a whole.

[0008] Preferably, the coil spring automatic assembly device further comprises a lifting mechanism, the stopper is fixedly arranged above the positioning seat, and the lifting mechanism drives the positioning seat to rise or fall so as to approach or move away from the stopper.

[0009] Preferably, the automatic assembly device for coil springs also includes a limiting member fixedly arranged on the side of the stop member. When the lifting mechanism drives the positioning seat to approach the stop member, the limiting member engages with the positioning seat to enclose the outer periphery of the base, thereby stopping the mating member in the axial direction of the coil spring, preventing the mating member from bursting out of the axial direction of the coil spring due to the elastic force of the coil spring when the outer end of the coil spring is twisted to store energy.

[0010] Preferably, the base is a rotating bracket for driving the switch electrical appliance to open and close, the rotating bracket includes a rotating shaft, and the matching piece is a cam with a hub connected to the rotating shaft.

[0011] Preferably, the rotating shaft has a U-shaped hollow structure, the hollow interior of which forms a square cavity, and the rotating mechanism is a retractable square rotating rod, which extends into the square cavity of the rotating shaft to form a circumferential limit fit with the rotating shaft to drive the rotating shaft to rotate.

[0012] Preferably, the coil spring automatic assembly device further comprises an outer shell, which encloses the positioning seat, the rotating mechanism, the stopper and the pressing mechanism.

[0013] Preferably, the outer shell includes an openable door, and the door is arranged at a position facing the positioning seat.

[0014] Preferably, the door is made of transparent material.

[0015] Preferably, the rotating member includes a hollow rotating shaft, and the rotating mechanism includes a rotatable rotating rod, and the rotating rod extends into the hollow interior of the rotating shaft to form a circumferential limit fit with the rotating shaft to drive the rotating shaft to rotate.

[0016] Preferably, the stopper is a stopper plate having a stopper surface facing the outer end of the coil spring.

[0017] Preferably, the outer end of the coil spring is a U-shaped hook structure.

[0018] The present invention also provides a coil spring automatic assembly method, comprising the following steps:

[0019] A. Provide a pre-assembled assembly in which the inner end of the coil spring is fixed relative to the base;

[0020] B. Positioning the preassembled assembly, rotating the base and simultaneously preventing the outer end of the coil spring from rotating;

[0021] C. When the outer end of the coil spring moves relatively to the docking slot adjacent to the base, the outer end of the coil spring is pressed radially inwardly of the coil spring so that the outer end of the coil spring is inserted into the docking slot of the base to complete the assembly.

[0022] The present invention has the following beneficial effects: the present invention goes against the grain, rotates the base to block the outer end of the coil spring, so that the outer end of the coil spring is twisted relative to the base, the base is large in size, there are many force-applying locations, the operation is convenient, and the rotation drive is relatively easy to achieve. The outer end of the coil spring can be blocked by only one stopper, which reduces the design cost. The installation process of the outer end of the coil spring can be automatically achieved using a coil spring automatic assembly device, which greatly improves production efficiency. At the same time, the non-manual operation method improves safety and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a coil spring in the prior art;

[0024] Figure 2 It is a structural diagram of a coil spring used in a rotating bracket of an isolating switch in the prior art (angle 1);

[0025] Figure 3 It is a structural diagram of a coil spring used in a rotating bracket of an isolating switch in the prior art (angle 2);

[0026] Figure 4 is a schematic diagram of the automatic assembly device for coil springs in Example 1 (one, the outer shell is hidden and the positioning seat is not raised);

[0027] Figure 5is a schematic diagram of the automatic assembly device for coil springs in Example 1 (the second one, the outer shell is hidden and the positioning seat is raised);

[0028] Figure 6 Schematic diagram of the automatic assembly device for coil springs in Example 1 (the third one shows the outer shell). DETAILED DESCRIPTION

[0029] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0031] Embodiment 1:

[0032] See also Figure 4-6 As shown, as a preferred embodiment of the present invention, an automatic coil spring assembly device is provided. In order to facilitate the explanation of the corresponding structure and effect, this embodiment is described by taking the assembly of a coil spring in a manual opening and closing rotating bracket of a disconnector as an example, which can be combined with the description in the background technology. The rotating bracket includes a base frame 1 (as a base), a coil spring 2 and a cam 3 (as a matching piece). The coil spring 2 is rotatably sleeved on the base frame 1, and the cam 3 is connected to the base frame 1 and rotates synchronously with the base frame 1. The inner end of the coil spring 2 is inserted into the cam 3, and the cam 3 is used to limit the rotation of the inner end of the coil spring 2 so that the inner end of the coil spring 2 is fixed relative to the base frame 1. The outer end 21 of the coil spring 2 is a curved U-shaped hook structure, and the base frame 1 is provided with a docking slot 121 for hooking and matching with the outer end 21 of the coil spring 2. The rotating bracket (pre-assembled component) preassembled as above is placed in the automatic coil spring assembly device of this embodiment, and the coil spring automatic assembly device automatically realizes the elastic clamping of the outer end 21 of the coil spring 2.

[0033] The coil spring automatic assembly device specifically includes a positioning seat 10, a rotating mechanism 4, a baffle 5, a lifting mechanism 6 and a pressing mechanism 9. The positioning seat 10 is used to carry and position the preassembled rotating bracket, the baffle 5 is fixedly arranged above the positioning seat 10, and the lifting mechanism 6 is used to drive the positioning seat 10 to move closer to or away from the baffle 5. Figure 5When the positioning seat 10 is driven by the lifting mechanism 6 to rise to the vicinity of the baffle 5, the abutment surface on one side of the baffle 5 just faces the outer end 21 of the coil spring 2, so that the baffle 5 can stop the outer end 21 of the coil spring 2 to limit the torsion of the outer end 21. In other embodiments, the baffle 5 can be replaced by other stoppers, such as a lever, and its shape is not limited as long as it can block the outer end 21 of the coil spring 2. The baffle 5 with a plate-like structure is easy to manufacture and install, and has a larger abutment surface area and better reliability.

[0034] Limiting members 7 are also fixedly provided on both sides of the baffle 5. When the lifting mechanism 6 drives the positioning seat 10 to rise to the vicinity of the baffle 5, the limiting members 7 engage with the positioning seat 10 to enclose the outer periphery of the base frame 1, thereby stopping the cam 3 in the axial direction of the disc spring 2 to prevent the cam 3 from bursting out of the axial direction of the disc spring 2 due to the elastic force of the disc spring 2 when the outer end 21 of the disc spring 2 is twisted to store energy.

[0035] The rotating mechanism 4 is a retractable and rotatable rotating rod, and the base frame 1 includes a rotating shaft 11. The rotating shaft 11 is U-shaped and hollow, and a square cavity is formed in the hollow interior thereof. The rotating rod is a square rod, and the rotating rod extends into the hollow interior of the rotating shaft 11 to form a circumferential limit fit with the rotating shaft 11 to drive the rotating shaft 11 to rotate. In other embodiments, the rotating mechanism 4 can also be other structures, such as replacing the rotating rod with a rotatable clamping claw, which clamps the base frame 1 for rotation. The circumferential limit fit between the rotating rod and the rotating shaft 11 does not have to be a fit between a square shaft and a square hole, and can be replaced by any molded connection shape, such as a triangular shaft and a triangular hole, a cut-edge circle and a cut-edge circular shaft. The specific shape can be flexibly selected based on the structure of the base frame 1 itself.

[0036] The pressing mechanism 9 includes a punch 91 for pressing the outer end portion 21 of the disc spring 2. When the outer end portion 21 of the disc spring 2 rotates to the outside of the docking slot 121, the punch 91 of the pressing mechanism 9 moves downward, pressing the outer end portion 21 of the disc spring 2 radially inward, so that the outer end portion 21 of the disc spring 2 is freed from the obstruction of the baffle 5 and is clamped in the docking slot 121 by elastic force.

[0037] like Figure 6 The coil spring automatic assembly device further comprises an outer shell 8, which encloses the positioning seat 10, the rotating mechanism 4, the pressing mechanism 9 and the baffle 5 to enhance safety and prevent the coil spring 2 and the cam 3 from collapsing and endangering personal safety. In order to take and place the rotating bracket, the outer shell 8 comprises an openable door 81, which is arranged at a position facing the positioning seat 10. Preferably, the door 81 is made of a transparent material, so that the working condition of the coil spring automatic assembly device can be observed in real time.

[0038] The working principle of this embodiment is as follows: open the door 81, position the preassembled rotating bracket on the positioning seat 10, start the automatic assembly device of the coil spring, so that the lifting mechanism 6 drives the positioning seat 10 to rise to the vicinity of the baffle 5, and the rotating mechanism 4 drives the base frame 1 to rotate. Since the outer end 21 of the coil spring 2 is blocked by the baffle 5, the outer end 21 is twisted relative to the base frame 1, so that the coil spring 2 is energy stored. When the outer end 21 of the coil spring 2 rotates to the adjacent docking slot 121, the punch 91 of the pressing mechanism 9 moves downward, and the outer end 21 of the coil spring 2 is pressed radially inward, so that the outer end 21 of the coil spring 2 is separated from the obstruction of the baffle 5 and is clamped in the docking slot 121 by elastic force. Thus, the base frame 1, the coil spring 2 and the cam 3 are assembled and fixed as a whole by the elastic force of the coil spring 2.

[0039] This embodiment does the opposite, rotating the base frame 1 to block the outer end 21 of the coil spring 2, so that the outer end 21 of the coil spring 2 is twisted relative to the base frame 1. Since the base frame 1 is large in size and has many force-applying locations, the rotation drive is relatively easy to achieve. The outer end 21 of the coil spring 2 can be blocked by only one stopper, which reduces the design cost. The installation process of the outer end 21 of the coil spring 2 can be automatically achieved using the coil spring automatic assembly device of this embodiment, which greatly improves production efficiency. At the same time, the non-manual operation method improves safety and has great promotion value.

[0040] Although this embodiment is described by taking the assembly of the coil spring in the manual opening and closing rotating bracket of the isolating switch as an example, it is obvious that the automatic assembly device of the coil spring in this embodiment can also be applied to other pre-assembled components for assembly. As long as the inner end of the coil spring is relatively fixed to a base, the structure in which the outer end of the coil spring needs to be twisted and clamped on the base can be achieved by the automatic assembly device of the coil spring in this embodiment.

[0041] In this embodiment, the cam 3 and the base frame 1 are fixed by the disc spring 2. In other embodiments, the cam 3 and the base frame 1 can be other bases and matching parts, for example, they can be replaced by a gear shaft and a gear keyed to the gear shaft. The inner end of the disc spring 2 is inserted into the gear, and the outer end is elastically clamped on the gear shaft. The gear shaft and the gear are clamped and fixed by the elastic force of the disc spring 2.

[0042] The axial limitation of the cam 3 is achieved in this embodiment by lifting and lowering the lifting mechanism 6 to drive the engagement of the positioning seat 10 and the limiting member 7. In other embodiments, an axial limitation mechanism of the cam 3, such as an axial end baffle, can be provided on the positioning seat 10. In this structure, there is no need to provide a lifting mechanism 6 and a limiting member 7. The advantage of using the lifting mechanism 6 is that a larger space can be opened between the baffle 5 and the positioning seat 10, which is convenient for positioning and placing a larger base frame 1.

[0043] In this embodiment, the outer end 21 of the coil spring 2 is a curved U-shaped hook structure, which has the advantage of more stable cooperation with the docking slot 121. In other embodiments, a coil spring with an outer end having an L-shaped curved structure can also be used.

[0044] The driving of the rotating mechanism 4, the lifting mechanism 6 and the pressing mechanism 9 can be realized by using existing driving mechanisms such as cylinders, motors, etc. The automatic control thereof can be realized by using existing electrical control technology. This example will not be described in detail.

[0045] Embodiment 2:

[0046] This embodiment provides an automatic assembly method for a coil spring, which is used to assemble a pre-assembled component in which the inner end of the coil spring is fixed relative to the base. Different from the method of fixing the base and twisting the outer end of the coil spring in the prior art, this embodiment fixes the outer end of the coil spring and rotates the base. The advantages are easy operation and high safety.

[0047] The method specifically comprises the following steps:

[0048] A. Provide a pre-assembled assembly with the inner end of the coil spring fixed relative to the base,

[0049] B. Positioning the preassembled assembly, rotating the base and simultaneously preventing the outer end of the coil spring from rotating,

[0050] C. When the outer end of the coil spring moves relatively to the docking slot adjacent to the base, the outer end of the coil spring is pressed radially inwardly of the coil spring so that the outer end of the coil spring is inserted into the docking slot of the base to complete the assembly.

[0051] Among them, the pre-assembled components of step A can be pre-assembled manually or automatically pre-assembled by a machine; the rotation of the base in step B can be achieved by manually rotating the base (such as setting a rotating handle to link the base), or by an automated rotating mechanism; the prevention of the rotation of the outer end of the coil spring in step B can be achieved by fixing the outer end of the clamp coil spring, or by limiting the outer end of the coil spring; the pressing of the outer end of the coil spring in step C can be achieved by manual pressing by a worker, or by an automated pressing mechanism. Preferably, the rotation of the base, the prevention of the rotation of the outer end of the coil spring, and the pressing of the outer end of the coil spring in steps B and C are respectively achieved by the rotating mechanism 4, the baffle 5, and the pressing mechanism 9 in embodiment 1.

[0052] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims will fall within the scope of protection of the present invention.

Claims

1. Automatic coil spring assembly device, used for assembling a pre-assembled assembly with the inner end of the coil spring fixed relative to a base, assembling the outer end of the coil spring in the docking slot of the base in the energy storage state, characterized in that: It includes a positioning seat, a rotating mechanism, a stopper and a pressing mechanism. Positioning seat, used to carry and position pre-assembled components, A rotating mechanism, used to drive the substrate to rotate, The stopper is used to stop the outer end of the coil spring when the rotating mechanism drives the base to rotate. The pressing mechanism presses the outer end of the disc spring radially inwardly after the outer end of the disc spring is twisted relative to the base to store energy in the disc spring, and when the outer end of the disc spring moves relatively to the docking slot adjacent to the base, so that the outer end of the disc spring is separated from the obstruction of the stopper and is inserted into the docking slot of the base by the elastic force of the disc spring to complete the assembly.

2. The automatic coil spring assembly device according to claim 1, characterized in that: The preassembled component also includes a mating piece that is sleeved on the base and forms a circumferential limiting relationship with the base. The coil spring can be rotatably sleeved on the base. The inner end of the coil spring is inserted and mated on the mating piece so that the inner end of the coil spring and the base are relatively fixed. When the outer end of the coil spring is clamped in the docking slot, the elastic force of the coil spring fixes the mating piece, the coil spring and the base as a whole.

3. The automatic coil spring assembly device according to claim 2, characterized in that: It also includes a lifting mechanism, the stopper is fixedly arranged above the positioning seat, and the lifting mechanism drives the positioning seat to rise or fall so as to approach or move away from the stopper.

4. The automatic coil spring assembly device according to claim 3, characterized in that: It also includes a limiting piece fixedly arranged on the side of the stopper. When the lifting mechanism drives the positioning seat to approach the stopper, the limiting piece engages with the positioning seat to enclose the outer periphery of the base, thereby stopping the matching piece in the axial direction of the disc spring, preventing the matching piece from bursting out of the axial direction of the disc spring due to the elastic force of the disc spring when the outer end of the disc spring is twisted to store energy.

5. The automatic coil spring assembly device according to claim 4, characterized in that: The base is a rotating bracket used to drive the switch electrical appliance to open and close. The rotating bracket includes a rotating shaft. The matching piece is a cam with a hub connected to the rotating shaft.

6. The automatic coil spring assembly device according to claim 5, characterized in that: The rotating shaft is a U-shaped hollow structure, and a square cavity is formed in the hollow interior thereof. The rotating mechanism is a retractable square rotating rod, and the rotating rod extends into the square cavity of the rotating shaft to form a circumferential limit fit with the rotating shaft to drive the rotating shaft to rotate.

7. The automatic coil spring assembly device according to claim 1, characterized in that: It also includes an outer shell, which seals the positioning seat, the rotating mechanism, the stopper and the pressing mechanism.

8. The automatic coil spring assembly device according to claim 7, characterized in that: The outer shell includes an openable door, and the door is arranged at a position facing the positioning seat.

9. The automatic coil spring assembly device according to claim 8, characterized in that: The door is made of transparent material.

10. Automatic assembly method of coil spring, characterized in that The steps include: A. Provide a pre-assembled assembly in which the inner end of the coil spring is fixed relative to a base, and the base is also provided with a docking slot for assembling the outer end of the coil spring; B. Positioning the preassembled assembly, rotating the base and simultaneously preventing the outer end of the coil spring from rotating; C. When the outer end of the coil spring moves relatively to the docking slot adjacent to the base, the outer end of the coil spring is pressed radially inwardly of the coil spring so that the outer end of the coil spring is inserted into the docking slot of the base to complete the assembly.

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