Fixtures and punch presses

Abstract

The present invention discloses a fixture and a punch press, comprising a base platform, two clamping arms, a drive member, and multiple amplitude sensing devices. The base platform includes a movable platform, two clamping arms are disposed on the movable platform, and the two clamping arms have a range of motion for approaching and separating. Multiple mounting slots are spaced apart on the side surfaces of each clamping arm, and multiple amplitude sensing devices are disposed in the multiple mounting slots. The amplitude sensing device includes a first housing, a first piezoelectric ceramic, a circuit board assembly, and an elastic pendulum. The elastic pendulum has a fixed end and a movable end. The fixed end is connected to the upper cavity wall of the amplitude cavity, and the movable end is spaced relative to the first piezoelectric ceramic. The movable end can swing relative to the fixed end, and within its swing range, the movable end can contact the first piezoelectric ceramic to generate an electrical signal from the first piezoelectric ceramic. The present invention aims to provide a fixture structure that can monitor whether a part is accurately positioned within the fixture.

Description

Technical Field

[0001] The present invention relates to the field of clamping technology, and in particular to a clamp and a punching machine. Background Art

[0002] Before stamping, parts usually need to be clamped in a fixture. Before clamping, the parts need to be positioned in the fixture. However, since the positioning of the parts in the fixture is usually done manually by the operator or assisted by positioning tooling, when the operator is inexperienced or the positioning tooling is worn out from long-term use, it will cause deviations in the positioning of the product in the fixture. These deviations are not easy to observe with the naked eye, but they will affect the processing accuracy. Summary of the Invention

[0003] The main purpose of the present invention is to provide a fixture and a punching machine, aiming to provide a fixture structure that can monitor whether a part is accurately positioned in the fixture.

[0004] To achieve the above-mentioned purpose, the clamp proposed by the present invention includes:

[0005] Base platforms, including movable platforms;

[0006] Two clamping arms are arranged on the movable platform, the two clamping arms have a movement stroke of approaching and moving away, and a plurality of mounting grooves are arranged at intervals on the side surface of each clamping arm;

[0007] a driving member for driving the two clamping arms to move; and

[0008] A plurality of amplitude sensing devices are respectively arranged in the plurality of the installation slots;

[0009] Wherein, the amplitude sensing device includes:

[0010] a first housing, forming an amplitude cavity, wherein an outer wall of the first housing is fixedly connected to the mounting groove;

[0011] a first piezoelectric ceramic, fixedly connected to the inner wall of the amplitude cavity;

[0012] a circuit board assembly electrically connected to the piezoelectric ceramic; and

[0013] An elastic pendulum is disposed in the amplitude cavity. The elastic pendulum has a fixed end and a movable end. The fixed end is connected to the upper cavity wall of the amplitude cavity. The movable end is spaced relative to the first piezoelectric ceramic. The movable end can swing relative to the fixed end, and within its swinging stroke, the movable end can touch the first piezoelectric ceramic to form an electrical signal in the first piezoelectric ceramic.

[0014] Optionally, an amplifier circuit is provided on the circuit board assembly for amplifying the electrical signal generated by the first piezoelectric ceramic.

[0015] Optionally, the base platform further comprises a base body, the base body is formed with a movable groove, and the movable platform is movably arranged in the movable groove;

[0016] The clamp further includes a buffer device, which includes a buffer portion, one end of which abuts against the lower end surface of the movable platform, and the other end of which is fixedly connected to the bottom of the movable groove.

[0017] Optionally, the buffer device includes:

[0018] a second housing, the second housing forming a buffer cavity;

[0019] a piston rod movably disposed in the buffer cavity and partially protruding from the buffer cavity, the piston rod having a movement stroke for moving up and down along the buffer cavity, wherein the end of the piston rod can abut against the lower end surface of the movable platform within the movement stroke of the piston rod; and

[0020] a first spring, one end of which is connected to the piston rod and the other end of which is fixedly connected to the inner wall of the buffer chamber;

[0021] The buffer portion includes the piston rod and the first spring.

[0022] Optionally, the buffer cavity is filled with a buffer solution.

[0023] Optionally, the clamp further comprises a power generation auxiliary device, and the power generation auxiliary device is arranged in the buffer cavity corresponding to the piston rod;

[0024] The power generation auxiliary device includes:

[0025] a third housing, wherein the third housing is formed with a receiving cavity;

[0026] Second piezoelectric ceramics are electrically connected to each other and stacked in the accommodation cavity;

[0027] A push rod, one end of which is connected to the end of the piston rod, and the other end of which extends into the accommodating cavity and is spaced relative to the wall of the accommodating cavity; the push rod can move up and down with the piston rod, and within its movement range, the push rod can contact the second piezoelectric ceramic to enable the piezoelectric ceramic to generate electricity.

[0028] Optionally, the elastic pendulum includes a second spring and an elastic contact ball;

[0029] One end of the second spring is connected to the upper cavity wall of the amplitude cavity, and the other end is connected to the elastic contact ball.

[0030] Optionally, the driving member includes a cylinder, which is fixedly arranged on the movable platform. The cylinder is formed with a telescopic portion that moves in the left and right directions, and the cylinder is connected to the clamping arm through the telescopic portion.

[0031] Optionally, the clamp further comprises a guide assembly for providing guidance for the two clamping arms;

[0032] The guide assembly includes a guide rail and a slider that cooperate with each other, and the guide rail is arranged on the movable platform in the left and right directions;

[0033] The sliding block is connected to the bottom of the clamping arm to drive the clamping arm to move along the guide rail.

[0034] The present invention further provides a punching machine, comprising a clamp, wherein the clamp comprises:

[0035] Base platforms, including movable platforms;

[0036] Two clamping arms are arranged on the movable platform, the two clamping arms have a movement stroke of approaching and moving away, and a plurality of mounting grooves are arranged at intervals on the side surface of each clamping arm;

[0037] a driving member for driving the two clamping arms to move; and

[0038] A plurality of amplitude sensing devices are respectively arranged in the plurality of the installation slots;

[0039] Wherein, the amplitude sensing device includes:

[0040] a first housing, forming an amplitude cavity, wherein an outer wall of the first housing is fixedly connected to the mounting groove;

[0041] a first piezoelectric ceramic, fixedly connected to the inner wall of the amplitude cavity;

[0042] a circuit board assembly electrically connected to the piezoelectric ceramic; and

[0043] An elastic pendulum is disposed in the amplitude cavity. The elastic pendulum has a fixed end and a movable end. The fixed end is connected to the upper cavity wall of the amplitude cavity. The movable end is spaced relative to the first piezoelectric ceramic. The movable end can swing relative to the fixed end, and within its swinging stroke, the movable end can touch the first piezoelectric ceramic to form an electrical signal in the first piezoelectric ceramic.

[0044] In the technical solution of the present invention, the two clamping arms can move closer and farther away under the action of the driving member to jointly clamp the workpiece to be processed. A plurality of mounting slots are provided on the two clamping arms, and the amplitude sensing devices are arranged in the plurality of mounting slots; the amplitude sensing device includes a first shell, a first piezoelectric ceramic, an elastic pendulum and a circuit board assembly, the first piezoelectric ceramic and the circuit board assembly are electrically connected, when the two clamping arms clamp the workpiece to be processed, the clamping arms will vibrate due to collision with the workpiece, the vibration will be transmitted to the elastic pendulum through the first shell, and drive the elastic pendulum to collide with the first piezoelectric ceramic; the vibration is different from the elastic pendulum and impacts the first piezoelectric ceramic. The frequency of a piezoelectric ceramic is also different, and the electrical signal generated by the first piezoelectric ceramic and transmitted to the circuit board assembly is also different; similarly, the position and collision angle of the part colliding with the clamping arm are different, and the vibration conditions of various parts of the clamping arm are also different. The circuit board assembly records the electrical signal of the first piezoelectric ceramic when the clamping arm and the part are normally clamped. When the positioning of the part in the two clamping arms deviates, the electrical signal generated by the first piezoelectric ceramic will change. The circuit board assembly that obtains this change will control the punch press to work and issue an alarm to warn the operator that the part is not placed in the correct position, thereby achieving the purpose of monitoring whether the part is correctly positioned in the fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0046] Figure 1 A schematic structural diagram of an embodiment of the clamp provided by the present invention;

[0047] Figure 2 for Figure 1 sectional view of

[0048] Figure 3 for Figure 1 a cross-sectional view of a medium amplitude sensing device;

[0049] Figure 4 for Figure 2 Cross-sectional view of the middle buffer device and power generation auxiliary device.

[0050] Description of Figure Numbers:

[0051]

[0052]

[0053] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0057] Before stamping, parts usually need to be clamped in a fixture. Before clamping, the parts need to be positioned in the fixture. However, since the positioning of the parts in the fixture is usually done manually by the operator or assisted by positioning tooling, when the operator is inexperienced or the positioning tooling is worn out from long-term use, it will cause deviations in the positioning of the product in the fixture. These deviations are not easy to observe with the naked eye, but they will affect the processing accuracy.

[0058] To solve the above problems, the present invention proposes a fixture, which aims to provide a fixture structure that can monitor whether the parts are accurately positioned in the fixture, wherein: Figures 1 to 4 This is a schematic structural diagram of an embodiment of the clamp provided by the present invention.

[0059] Reference Figures 1 to 3The clamp 1000 includes a base platform 1, two clamping arms 2, a driving member 3, and a plurality of amplitude sensing devices 4. The base platform 1 includes a movable platform 11. The two clamping arms 2 are arranged on the movable platform 11. The two clamping arms 2 have a movement stroke of approaching and moving away. A plurality of mounting grooves 21 are arranged on the side surface of each clamping arm 2. The driving member 3 is used to drive the two clamping arms 2 to move. The plurality of amplitude sensing devices 4 are respectively arranged in the plurality of mounting grooves 21. The amplitude sensing device 4 includes a first shell 41, a first piezoelectric ceramic 42, a circuit board assembly and an elastic pendulum. The first The shell 41 forms an amplitude cavity, the outer wall of the first shell 41 is fixedly connected to the mounting groove 21, the first piezoelectric ceramic 42 is fixedly connected to the inner wall of the amplitude cavity, the circuit board assembly is electrically connected to the piezoelectric ceramic, and the elastic pendulum is arranged in the amplitude cavity. The elastic pendulum has a fixed end and a movable end, the fixed end is connected to the upper cavity wall of the amplitude cavity, and the movable end is relatively spaced apart from the first piezoelectric ceramic 42. The movable end can swing relative to the fixed end, and within its swinging stroke, the movable end can touch the first piezoelectric ceramic 42 to form an electrical signal for the first piezoelectric ceramic 42.

[0060] In the technical solution of the present invention, the two clamping arms 2 can move closer and farther away under the action of the driving member 3, so as to jointly clamp the parts to be processed. A plurality of mounting slots 21 are provided on the two clamping arms 2, and the amplitude sensing devices 4 are arranged in the plurality of mounting slots 21; the amplitude sensing device 4 includes a first shell 41, a first piezoelectric ceramic 42, an elastic pendulum and a circuit board assembly, the first piezoelectric ceramic 42 and the circuit board assembly are electrically connected, when the two clamping arms 2 clamp the parts to be processed, the clamping arms 2 will vibrate due to collision with the parts, the vibration will be transmitted to the elastic pendulum through the first shell 41, and drive the elastic pendulum to collide with the first piezoelectric ceramic 42; the vibration is different from the elastic pendulum collision The frequency of the first piezoelectric ceramic 42 is also different, and the electrical signal generated by the first piezoelectric ceramic 42 and transmitted to the circuit board assembly is also different; similarly, the position and collision angle of the part colliding with the clamping arm 2 are different, and the vibration conditions of various parts of the clamping arm 2 are also different. The circuit board assembly records the electrical signal of the first piezoelectric ceramic 42 when the clamping arm 2 and the part are normally clamped. When the positioning of the part in the two clamping arms 2 deviates, the electrical signal generated by the first piezoelectric ceramic 42 will change. The circuit board assembly that obtains this change will control the punch press to work and issue an alarm to warn the operator that the part is not placed in the correct position, thereby achieving the purpose of monitoring whether the part is correctly positioned in the fixture 1000.

[0061] In order to improve the sensitivity of the amplitude sensing device 4, in one embodiment of the present invention, an amplifier circuit is provided on the circuit board assembly to amplify the electrical signal generated by the first piezoelectric ceramic 42. In this way, through the amplifier circuit, the weak signal excited by the first piezoelectric ceramic 42 can be quickly amplified into an electrical signal that can be recognized by the circuit board assembly, thereby improving the sensitivity of the amplitude sensing device 4.

[0062] To prevent the first piezoelectric ceramic 42 from frequently colliding with the elastic pendulum and causing damage to the piezoelectric ceramic, please refer to Figure 3 In one embodiment of the present invention, the elastic pendulum includes a second spring 431 and an elastic ball 432. One end of the second spring 431 is connected to the upper wall of the amplitude cavity, and the other end is connected to the elastic ball 432. When the elastic ball 432 contacts the first piezoelectric ceramic 42, it elastically deforms to absorb some of the kinetic energy of the impact on the first piezoelectric ceramic 42, thereby protecting the first piezoelectric ceramic 42. The elastic ball 432 can be made of elastic rubber or elastic plastic, which is not limited by the present invention.

[0063] In order to improve the durability of the clamp 1000 and prevent the clamp 1000 from being damaged prematurely, in one embodiment of the present invention, the base platform 1 also includes a base body 12, and the base body 12 is formed with a movable groove 121. The movable platform 11 is movably arranged in the movable groove 121. The clamp 1000 also includes a buffer device 5, and the buffer device 5 includes a buffer part, one end of the buffer part abuts against the lower end surface of the movable platform 11, and the other end is fixedly connected to the bottom of the movable groove 121. When the part fixed on the movable platform 11 contacts the punch of the punch press, the buffer device 5 located under the movable platform 11 will buffer the impact kinetic energy of the punch and convert the impact kinetic energy into other mechanical energy, thereby achieving the purpose of protecting the movable platform 11.

[0064] The buffer device 5 can be a hydraulic damper or a spring, and the present invention is not limited to this. In one embodiment of the present invention, the buffer device 5 includes a second shell 51, a piston rod 52 and a first spring 53. The second shell 51 forms a buffer cavity. The piston rod 52 is movably arranged in the buffer cavity and partially protrudes out of the buffer cavity. The piston rod 52 has a movement stroke that moves up and down along the buffer cavity. Within the movement stroke of the piston rod 52, the end of the piston rod 52 can abut against the lower end surface of the movable platform 11. The first spring 53 has one end connected to the piston rod 52 and the other end fixedly connected to the inner wall of the buffer cavity. The buffer part includes the piston rod 52 and the first spring 53. When the punch of the punch press contacts the movable platform 11, the piston rod 52 will move downward under the push of the movable platform 11 and compress the first spring 53 in contact with it. In this way, the mechanical energy of the punch of the punch press is converted into elastic potential energy of the first spring 53, so as to achieve the purpose of protecting the movable platform.

[0065] Furthermore, in order to improve the buffering capacity of the buffer device 5 in the above embodiment, in one embodiment of the present invention, the buffer chamber is filled with a buffer solution to provide further buffering for the piston rod 52, and further convert the kinetic energy of the punch head into the buoyancy potential energy of the buffer solution, thereby further improving the buffering capacity of the buffer device 5.

[0066] It is understandable that if the large amount of kinetic energy brought by the punch is converted into other mechanical energy and dissipated only through the buffer device 5, a large amount of energy will be wasted. Therefore, please refer to Figure 4 In one embodiment of the present invention, the fixture 1000 further includes a power generation auxiliary device 6, which is disposed in the buffer cavity corresponding to the piston rod 52; the power generation auxiliary device 6 includes a third housing 61, a second piezoelectric ceramic 62, and a push rod 63. The third housing 61 forms an accommodating cavity, and the second piezoelectric ceramics 62 are electrically connected to each other and stacked in the accommodating cavity. One end of the push rod 63 is connected to the end of the piston rod 52, and the other end extends into the accommodating cavity and is spaced relative to the cavity wall of the accommodating cavity. The push rod 63 can move up and down with the piston rod, and within its movement range, the push rod 63 contacts the second piezoelectric ceramic 62 to enable the piezoelectric ceramic to generate electricity. When the movable platform 11 moves downward under the impact of the punch, it drives the push rod 63 to move downward and hits the multiple second piezoelectric ceramics 62 stacked below the push rod 63, so that the second piezoelectric ceramics 62 generate electricity, and the kinetic energy of the punch is converted into electrical energy for recycling, thereby achieving the purpose of recycling the punch energy.

[0067] At the same time, the buffer device 5 can also provide buffering for the second piezoelectric ceramic 62 to prevent the punching force from being too large, which may cause the second piezoelectric ceramic 62 to be damaged by excessive kinetic energy; the electrical energy can be stored in a battery, or directly used as a power supply for low-power products such as electric lights and displays, and the present invention does not impose any restrictions on this.

[0068] The driving member 3 can be a motor screw or a hydraulic cylinder. The present invention does not limit this. From a cost perspective, in one embodiment of the present invention, the driving member 3 includes a cylinder 3a, which is fixed on the movable platform 11. The cylinder 3a is formed with a telescopic part that moves in the left and right directions. The cylinder 3a is connected to the clamping arm 2 through the telescopic part. The cylinders 3a provided on the two clamping arms 2 are arranged opposite to each other, so as to push the two clamping arms 2 closer to and away from each other.

[0069] In order to enable the clamping arm 2 to run smoothly on the movable platform 11, in one embodiment of the present invention, the clamp 1000 also includes a guide assembly 7 for providing guidance for the two clamping arms 2. The guide assembly 7 includes a guide rail 71 and a slider 72 that cooperate with each other. The guide rail 71 is arranged on the movable platform 11 in the left and right directions. The slider 72 is connected to the bottom of the clamping arm 2 to drive the clamping arm 2 to move along the guide rail 71. In this way, guidance is provided for the movement of the clamping arm 2, so that the clamping arm 2 can move according to a predetermined trajectory.

[0070] The present invention also proposes a punch press, which includes a clamp. The specific structure of the clamp refers to the above embodiment. Since this punch press adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0071] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fixture for clamping machine tool parts, characterized in that: include: Base platforms, including movable platforms; Two clamping arms are arranged on the movable platform, the two clamping arms have a movement stroke of approaching and moving away, and a plurality of mounting grooves are arranged at intervals on the side surface of each clamping arm; A driving member, used for driving the two clamping arms to move; as well as, A plurality of amplitude sensing devices are respectively arranged in the plurality of the installation slots; Wherein, the amplitude sensing device includes: a first housing, forming an amplitude cavity, wherein an outer wall of the first housing is fixedly connected to the mounting groove; a first piezoelectric ceramic, fixedly connected to the inner wall of the amplitude cavity; a circuit board assembly electrically connected to the first piezoelectric ceramic; and An elastic pendulum is disposed in the amplitude cavity. The elastic pendulum has a fixed end and a movable end. The fixed end is connected to the upper cavity wall of the amplitude cavity. The movable end is spaced relative to the first piezoelectric ceramic. The movable end can swing relative to the fixed end, and within its swinging stroke, the movable end can touch the first piezoelectric ceramic to form an electrical signal in the first piezoelectric ceramic.

2. The clamp according to claim 1, wherein The circuit board assembly is provided with an amplifier circuit for amplifying the electrical signal generated by the first piezoelectric ceramic.

3. The clamp according to claim 1, wherein The base platform further comprises a base body, the base body is formed with a movable groove, and the movable platform is movably arranged in the movable groove; The clamp further includes a buffer device, which includes a buffer portion, one end of which abuts against the lower end surface of the movable platform, and the other end of which is fixedly connected to the bottom of the movable groove.

4. The clamp according to claim 3, wherein: The buffer device comprises: a second housing, the second housing forming a buffer cavity; a piston rod movably disposed in the buffer cavity and partially protruding from the buffer cavity, the piston rod having a movement stroke for moving up and down along the buffer cavity, wherein the end of the piston rod can abut against the lower end surface of the movable platform within the movement stroke of the piston rod; and a first spring, one end of which is connected to the piston rod and the other end of which is fixedly connected to the inner wall of the buffer chamber; The buffer portion includes the piston rod and the first spring.

5. The clamp according to claim 4, wherein: The buffer cavity is filled with a buffer solution.

6. The clamp according to claim 4, wherein: The clamp further includes a power generation auxiliary device, which is arranged in the buffer cavity corresponding to the piston rod; The power generation auxiliary device includes: a third housing, wherein the third housing is formed with a receiving cavity; Second piezoelectric ceramics are electrically connected to each other and stacked in the accommodation cavity; A push rod, one end of which is connected to the end of the piston rod, and the other end of which extends into the accommodating cavity and is spaced relative to the wall of the accommodating cavity; the push rod can move up and down with the piston rod, and within its movement range, the push rod can contact the second piezoelectric ceramic to enable the second piezoelectric ceramic to generate electricity.

7. The clamp according to claim 1, wherein: The elastic pendulum comprises a second spring and an elastic contact ball; One end of the second spring is connected to the upper cavity wall of the amplitude cavity, and the other end is connected to the elastic contact ball.

8. The clamp according to claim 1, wherein The driving member includes a cylinder, which is fixedly arranged on the movable platform. The cylinder is formed with a telescopic portion that moves in the left and right directions. The cylinder is connected to the clamping arm through the telescopic portion.

9. The clamp according to claim 1, wherein: Also included is a guide assembly for providing guidance for the two clamping arms; The guide assembly includes a guide rail and a slider that cooperate with each other, and the guide rail is arranged on the movable platform in the left and right directions; The sliding block is connected to the bottom of the clamping arm to drive the clamping arm to move along the guide rail.

10. A punching machine, characterized in that: Comprising the clamp according to any one of claims 1 to 9.

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