clamps

Abstract

The present invention relates to a clamp, which comprises a left slider, a right slider, a voice coil motor and a guide rail, wherein the left slider and the right slider are arranged on the guide rail in a relative sliding manner, wherein the voice coil motor comprises a stator, a first mover and a second mover, wherein the stator and the stator are arranged relative to each other, and a mover sliding area is formed between the stator and the stator, wherein the first mover is placed in the mover sliding area to connect the left slider and drive the left slider to slide along the guide rail, wherein the second mover is placed in the mover sliding area to connect the right slider and drive the right slider to slide along the guide rail, wherein the first mover and the second mover are both provided with a grating ruler reading head or a grating ruler, and the position of the clamp corresponding to the grating ruler reading head or the grating ruler is provided with a grating ruler or a grating ruler reading head. The voice coil motor has short electrical and mechanical time delay, fast response, and can adjust the approach distance and separation distance of the left slider and the right slider through the stroke, thereby adjusting the clamping area, so that the clamp can clamp objects more accurately.

Description

Technical Field

[0001] The invention relates to a clamp. Background Art

[0002] Existing clamps are generally driven by servo motors to control the clamp jaws to move closer to or away from each other. Due to the use of servo motors, the clamp has low precision, so traditional clamps are not suitable for precision operations. Summary of the invention

[0003] The purpose of the present invention is to provide a clamp with high precision and simple structure.

[0004] The object of the present invention is achieved in that:

[0005] A fixture comprises a left slider, a right slider, a voice coil motor and a guide rail, wherein the left slider and the right slider are arranged on the guide rail in a relative sliding manner, the voice coil motor comprises a stator, a first mover and a second mover, the stator and the stator are arranged relative to each other, a mover sliding area is formed between the stator and the stator, the first mover is placed in the mover sliding area to connect with the left slider and drive the left slider to slide along the guide rail, the second mover is placed in the mover sliding area to connect with the right slider and drive the right slider to slide along the guide rail, the first mover and the second mover are both provided with a grating scale reading head or a grating scale, and a grating scale or a grating scale reading head is provided at a position of the fixture corresponding to the grating scale reading head or the grating scale.

[0006] The voice coil motor has short electrical and mechanical time delays, fast response, linear force-stroke characteristics and high electrical-mechanical energy conversion rate. The voice coil motor is more suitable for control systems that require fast and high-precision positioning. The user can adjust the movement speed, trajectory and stroke of the first mover and the second mover by controlling the voltage, the change pattern, and the power-on time. The operation is simple. When the first mover and the second mover move, the displacement sensor of the grating ruler accurately controls the stroke of the first mover and the second mover. The stroke can be used to adjust the approach distance and separation distance of the left slider and the right slider, thereby adjusting the clamping area, so that the clamp can clamp objects more accurately.

[0007] The purpose of the present invention can also be solved by the following technical measures:

[0008] As a more specific solution, it also includes a left connecting block and a right connecting block, the guide rail is provided with a slide groove, the bottom surface of the slide groove is provided with a left limiting cavity and a right limiting cavity, the left slider and the right slider are placed in the slide groove, the upper end of the left slider passes through the left limiting cavity to connect to the left slider, the lower end of the left slider is connected to the first mover, the upper end of the right slider passes through the right limiting cavity to connect to the right slider, and the lower end of the right slider is connected to the second mover. The left limiting cavity and the right limiting cavity limit the moving distance of the left connecting block and the right connecting block, thereby limiting the sliding distance of the left slider and the right slider, preventing the left slider and the right slider from deviating from the slide groove, and improving the stability of the clamp.

[0009] As a more specific solution, the side walls of the left and right sliders are provided with limiting convex edges along their length direction, and the inner walls of the slide grooves are provided with limiting slide grooves along their length direction, and the limiting convex edges extend into the corresponding limiting slide grooves. The left and right sliders are placed in the slide grooves, and the limiting convex edges extend into the corresponding limiting slide grooves, so as to prevent the left and right sliders from deflecting during the sliding process and improve the stability of the fixture.

[0010] As a more specific solution, it also includes a support seat, the support seat is located below the first mover and the second mover, the lower ends of the first mover and the second mover are connected to the grating ruler, and the positions of the support seat corresponding to the first mover and the second mover are respectively provided with corresponding grating ruler reading heads. The grating ruler is installed on the first mover and the second mover respectively, and when the first mover and the second mover move, the signal of the grating ruler displacement sensor can be collected, and the stroke of the first mover and the second mover can be accurately measured. The approach distance and separation distance of the left slider and the right slider can be adjusted through the stroke, thereby adjusting the clamping area.

[0011] As a more specific solution, it also includes a base, the voice coil motor is placed in the base, and the guide rail is placed on the base.

[0012] As a more specific solution, an air gap is formed between the first mover and the stator and between the second mover and the stator. Due to the air gap between the stator, the first mover and the second mover, the first mover and the second mover can slide more smoothly in the mover sliding area.

[0013] As a more specific solution, the stator is a coil, and the first mover and the second mover are both permanent magnets. Since the stator is a coil, the first mover and the second mover are both permanent magnets, a moving magnet voice coil motor is formed. The advantages of a moving magnet voice coil motor are easy heat dissipation, a larger current can be passed through the coil, and a longer stroke.

[0014] As a more specific solution, a circuit board is arranged at the bottom of the coil, and the circuit board provides power to the coil.

[0015] As a more specific solution, the stator is a permanent magnet, and the first mover and the second mover are both coils. Since the stator is a permanent magnet, the first mover and the second mover are both coils, the stator is a permanent magnet, the first mover and the second mover are both coils, and the slide area of ​​the mover is provided with an iron core, and the first mover and the second mover are sleeved on the iron core and slide along the length direction of the iron core. Thus, a moving coil voice coil motor is formed. The advantages of the moving coil voice coil motor are that the moving part has a small mass, a small inertia, and a good dynamic response.

[0016] As a more specific solution, the voice coil motor further includes a circuit board, the first mover and the second mover are respectively connected to the circuit board via wires, and the circuit board provides power for the first mover and the second mover.

[0017] The beneficial effects of the present invention are as follows:

[0018] In the present invention, the voice coil motor has short electrical and mechanical time delays, fast response, linear force-stroke characteristics and high electrical-mechanical energy conversion rate. The voice coil motor is more suitable for control systems that require fast and high-precision positioning. The user can adjust the movement speed, trajectory and stroke of the first mover and the second mover by controlling the voltage, the change rule, and the power-on time. The operation is simple, and when the first mover and the second mover move, the displacement sensor of the grating ruler accurately controls the stroke of the first mover and the second mover. The approach distance and separation distance of the left slider and the right slider can be adjusted according to the stroke, thereby adjusting the clamping area, so that the clamp can clamp objects more accurately.

[0019] In the present invention, the grating ruler is respectively installed on the first mover and the second mover. When the first mover and the second mover move, the signal of the grating ruler displacement sensor can be collected, and the stroke of the first mover and the second mover can be accurately measured. The approach distance and separation distance of the left slider and the right slider can be adjusted according to the stroke, thereby adjusting the clamping area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the fixture of Example 1.

[0021] Figure 2 for Figure 1 Top view of the .

[0022] Figure 3 for Figure 2 AA section view.

[0023] Figure 4 for Figure 2 BB cross-sectional view.

[0024] Figure 5 This is the fixture assembly diagram of Example 1.

[0025] Figure 6 This is an exploded view of the fixture of Example 1.

[0026] Figure 7 Schematic diagram of the fixture of Example 2.

[0027] Figure 8 for Figure 2 Top view of the .

[0028] Fig. 9 for Figure 2 CC cross-sectional view.

[0029] Fig.10 for Figure 2 DD cross-sectional view.

[0030] Fig.11 This is the fixture assembly diagram of Example 2.

[0031] Fig.12 This is an exploded view of the fixture of Example 2. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0033] Combination Figures 1 to 6 As shown, in embodiment 1, a fixture includes a left slider 1, a right slider 2, a voice coil motor 3, a guide rail 4, a support seat 5, a base 6, a left connecting block 7 and a right connecting block 8.

[0034] The voice coil motor 3 is placed in the base 6 , and includes a stator 31 , a first mover 32 , a second mover 33 and a circuit board 9 . The stators 31 are arranged opposite to each other, and a mover sliding area 34 is formed between the stators 31 and the stators 31 .

[0035] The first mover 32 and the second mover 33 are placed in the mover sliding area 34 in a sliding manner, and an air gap is formed between the first mover 32 and the stator 31 and between the second mover 33 and the stator 31 .

[0036] The guide rail 4 is seated on the base 6 , and is provided with a slide groove 41 . The inner wall of the slide groove 41 is provided with a limit slide groove 42 along its length direction, and the bottom surface of the slide groove 41 is provided with a left limit cavity 43 and a right limit cavity 44 .

[0037] The side walls of the left slider 1 and the right slider 2 are both provided with limiting convex edges 10 along their length directions. The left slider 1 and the right slider 2 are arranged on the slide groove 41 in a relatively sliding manner, and the limiting convex edges 10 extend into the corresponding limiting slide grooves 42 .

[0038] The left connecting block 7 is placed in the base 6, the lower end of the left connecting block 7 is connected to the first mover 32, and the upper end of the left connecting block 7 is connected to the left slider 1. The right connecting block 8 is placed in the base 6, the lower end of the right connecting block 8 is connected to the second mover 33, and the upper end of the right connecting block 8 is connected to the right slider 2.

[0039] The bottom of the first mover 32 and the bottom of the second mover 33 are both provided with a grating scale 100. The support seat 5 is arranged in the base 6 and is located below the first mover 32 and the second mover 33. The support seat 5 is provided with a corresponding grating scale reading head 200 at the position corresponding to the grating scale 100.

[0040] The stator 31 is a coil, the first mover 32 and the second mover 33 are both permanent magnets, the circuit board 9 is arranged in the base 6, the circuit board 9 and the coil are connected by a wire, and the circuit board 9 provides power for the coil.

[0041] Combination Figures 7 to 12 As shown, embodiment 2, embodiment 2 differs from embodiment 1 in that: the stator 31 of embodiment 2 is a permanent magnet, the first mover 32 and the second mover 33 are both coils, the mover sliding area 34 is provided with an iron core 35, the first mover 32 and the second mover 33 are sleeved on the iron core 35 and slide along the length direction of the iron core 35. The circuit board 9 is arranged in the base 6, the circuit board 9 and the coil are connected by a wire, and the circuit board 9 provides power to the coil.

[0042] Working principle:

[0043] Based on the structural characteristics of the voice coil motor 3 and using the principle that a conductor with current is subjected to Ampere force in a magnetic field, when the coil is energized, it will be subjected to the magnetic field force of the permanent magnet, thereby driving the left slider 1 and the right slider 2 to perform linear motion.

[0044] Moreover, changing the voltage polarity applied to both ends of the coil will cause the first mover 32 and the second mover 33 to be subjected to a reverse Ampere force, thereby changing the movement direction of the first mover 32 and the second mover 33, making the first mover 32 and the second mover 33 move closer to or separate from each other, thereby achieving a clamping function. Therefore, the user can adjust the movement speed, trajectory and stroke of the first mover 32 and the second mover 33 by controlling the voltage size, change pattern, and power-on time, and the operation is simple.

[0045] Furthermore, by utilizing the principle of interference and diffraction of light and with the help of the displacement sensor of the grating ruler 100, the stroke of the first mover 32 and the second mover 33 is accurately controlled, the grating ruler reading head 200 is installed on the support seat 5 as a reference, and the grating ruler 100 is installed on the first mover 32 and the second mover 33 respectively. When the first mover 32 and the second mover 33 move, the signal of the displacement sensor of the grating ruler 100 can be collected, and the stroke of the first mover 32 and the second mover 33 can be accurately measured. The approach distance and separation distance of the left slider 1 and the right slider 2 can be adjusted according to the stroke, thereby adjusting the clamping area.

Claims

1. A fixture, comprising a left slider, a right slider, a voice coil motor and a guide rail, characterized in that: The left slider and the right slider are arranged on the guide rail in a relatively sliding manner, the voice coil motor includes a stator, a first mover and a second mover, the stator and the stator are arranged relatively to each other, a mover sliding area is formed between the stator and the stator, the first mover is placed in the mover sliding area to connect with the left slider and drive the left slider to slide along the guide rail, the second mover is placed in the mover sliding area to connect with the right slider and drive the right slider to slide along the guide rail, and also includes a support seat, the support seat is located below the first mover and the second mover; The first mover and the second mover are both provided with a grating ruler reading head, and a grating ruler is provided at a position of the support seat corresponding to the grating ruler reading head; Alternatively, both the first mover and the second mover are provided with grating scales, and a grating scale reading head is provided at a position of the support seat corresponding to the grating scale reading head.

2. The clamp according to claim 1, characterized in that: It also includes a left connecting block and a right connecting block, the guide rail is provided with a slide groove, the bottom surface of the slide groove is provided with a left limiting cavity and a right limiting cavity, the left slider and the right slider are placed in the slide groove, the upper end of the left slider passes through the left limiting cavity to connect to the left slider, the lower end of the left slider is connected to the first mover, the upper end of the right slider passes through the right limiting cavity to connect to the right slider, and the lower end of the right slider is connected to the second mover.

3. The clamp according to claim 2, characterized in that: The side walls of the left slider and the right slider are both provided with limiting convex edges along their length direction, and the inner walls of the slide grooves are both provided with limiting slide grooves along their length direction, and the limiting convex edges extend into the corresponding limiting slide grooves.

4. The clamp according to claim 1, characterized in that: It also includes a base, the voice coil motor is placed in the base, and the guide rail is placed on the base.

5. The clamp according to claim 1, characterized in that: An air gap is formed between the first mover and the stator and between the second mover and the stator.

6. The clamp according to any one of claims 1 to 5, characterized in that: The stator is a coil, and the first mover and the second mover are both permanent magnets.

7. The clamp according to claim 6, characterized in that: A circuit board is arranged at the bottom of the coil, and the circuit board provides power to the coil.

8. The clamp according to any one of claims 1 to 5, characterized in that: The stator is a permanent magnet, the first mover and the second mover are both coils, an iron core is provided in the sliding area of ​​the mover, and the first mover and the second mover are sleeved on the iron core and slide along the length direction of the iron core.

9. The clamp according to claim 8, characterized in that: The voice coil motor further includes a circuit board, the first mover and the second mover are respectively connected to the circuit board via wires, and the circuit board provides power for the first mover and the second mover.

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