Automatic clamping device for spring movement knife

Abstract

The present invention discloses an automatic clamping device for a spring core cutter, aiming to provide an automatic clamping device for a spring core cutter that is not only convenient for installing the core cutter with high installation efficiency, but also stable and reliable in installing the core cutter. It includes a core cutter mounting seat, on which a core cutter mounting groove is provided; a core cutter, which is placed in the core cutter mounting groove; a two-way tensioning device, which is used to lock and fix the core cutter in the core cutter mounting groove. The two-way tensioning device includes a floating seat, a cylinder fixed on the floating seat, two left and right tensioning blocks located in the core cutter mounting groove, and two front and rear locking blocks located between the two left and right tensioning blocks. The two front and rear locking blocks are distributed along the axial direction of the cylinder. The two left and right tensioning blocks are on the same side of the core cutter, and the front locking block is fixed on the floating seat. The cylinder is used to drive the rear locking block to approach or move away from the front locking block.

Description

Technical Field

[0001] The present invention relates to a spring machine, and more particularly to an automatic clamping device for a core cutter of a spring machine. Background Art

[0002] The core cutter of a spring machine is a key component of the spring machine. At present, the core cutter of the spring machine is generally locked and fixed by multiple bolts; and for the production of springs of different specifications, it is often necessary to replace different core cutters, which not only makes the replacement and installation of the core cutter of the spring machine inconvenient, affecting the processing efficiency of spring processing; but also in the long-term production and use process, the bolts are prone to loosen, resulting in the loosening of the core cutter, and affecting the spring processing accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic clamping device for a core cutter of a spring machine, which is not only convenient for installing the core cutter, with high installation efficiency; but also the core cutter is stably and reliably installed.

[0004] The technical solution of the present invention is as follows:

[0005] An automatic clamping device for a core cutter of a spring machine, comprising:

[0006] A core cutter mounting seat, on which a core cutter mounting groove is provided;

[0007] A core cutter, which is placed in the core cutter mounting groove;

[0008] A two-way tensioning device, which is used to lock and fix the core cutter in the core cutter mounting groove. The two-way tensioning device includes a floating seat, a cylinder fixed on the floating seat, two left and right tensioning blocks located in the core cutter mounting groove, and two front and rear locking blocks located between the two left and right tensioning blocks. The two front and rear locking blocks are distributed along the axial direction of the cylinder. The two left and right tensioning blocks are on the same side of the core cutter, and the front locking block is fixed on the floating seat. The cylinder is used to drive the rear locking block to approach or move away from the front locking block. In the process of the cylinder driving the rear locking block to approach the front locking block, the two front and rear locking blocks will push and drive the two left and right tensioning blocks to expand, so as to lock and fix the core cutter in the core cutter mounting groove. In this way, the core cutter is automatically locked and fixed in the core cutter mounting groove, which is not only convenient for installing the core cutter, with high installation efficiency; but also the core cutter is locked and fixed by the two front and rear locking blocks pushing and driving the two left and right tensioning blocks to expand, making the core cutter more stably and reliably installed.

[0009] Preferably, the two-way tensioning device further includes a driving rod, which is coaxially distributed with the cylinder. A driving rod through hole is provided on the front locking block. One end of the driving rod is connected to the piston rod of the cylinder, and the other end of the driving rod passes through the driving rod through hole and is connected to the rear locking block. In this way, not only can the cylinder drive the rear locking block to approach or move away from the front locking block, but also the structure is compact, which is beneficial to reducing the volume of the automatic clamping device for the core cutter of the spring machine.

[0010] Preferably, a tension spring is further provided between the front and rear locking blocks. One end of the tension spring is connected to the front locking block, and the other end of the tension spring is connected to the rear locking block. The tension spring is used to provide a pulling force to make the front and rear locking blocks approach each other. In this way, during the use of the automatic clamping device for the spring core cutter, if the air cylinder leaks, the tension spring can also provide a pulling force to make the front and rear locking blocks approach each other, keep the left and right tensioning blocks expanded, and lock and fix the core cutter in the core cutter installation groove; thus improving the problem of the core cutter loosening caused by the leakage of the air cylinder.

[0011] Preferably, the bi-directional tensioning device further includes a driving rod and a pre-tightening compression spring. The driving rod is coaxially distributed with the air cylinder. A driving rod through hole is provided on the front locking block. One end of the rear locking block facing away from the front locking block is provided with a receiving hole, and the inner end surface of the receiving hole is provided with a rear through hole. One end of the driving rod is connected to the piston rod of the air cylinder. The other end of the driving rod sequentially passes through the driving rod through hole and the rear through hole and extends into the receiving hole. An end stop is provided at the other end of the driving rod. A front limit block and a rear limit block are provided on the driving rod. The front limit block is located between the front and rear blocks, and the rear limit block is located in the receiving hole. The pre-tightening compression spring is sleeved on the driving rod. One end of the pre-tightening compression spring abuts against the inner end surface of the receiving hole, and the other end of the pre-tightening compression spring abuts against the end stop. In this way, during the use of the automatic clamping device for the spring core cutter, if the air cylinder leaks slightly, the pre-tightening compression spring can also provide a pre-pressure to make the front and rear locking blocks approach each other, keep the left and right tensioning blocks expanded, and lock and fix the core cutter in the core cutter installation groove; thus improving the problem of the core cutter loosening caused by the leakage of the air cylinder.

[0012] Preferably, front locking inclined surfaces are provided on the left and right side surfaces of the front locking block facing the left and right tensioning blocks, and front tensioning inclined surfaces cooperating with the front locking inclined surfaces are provided on the left and right tensioning blocks; rear locking inclined surfaces are provided on the left and right side surfaces of the rear locking block facing the left and right tensioning blocks, and rear tensioning inclined surfaces cooperating with the rear locking inclined surfaces are provided on the left and right tensioning blocks.

[0013] Preferably, the inclination angle of the front locking inclined surface is less than the equivalent friction angle, and the inclination angle of the rear locking inclined surface is less than the equivalent friction angle. During the use of the automatic clamping device for the spring core cutter, if the air cylinder leaks, since the inclination angle of the front locking inclined surface is less than the equivalent friction angle and the inclination angle of the rear locking inclined surface is less than the equivalent friction angle, in this way, when the two tensioning blocks are only subjected to the extrusion force that makes the two tensioning blocks approach each other, the front and rear locking blocks can remain stationary, thereby keeping the core cutter in a locked state and effectively improving the problem of the core cutter loosening caused by the leakage of the air cylinder.

[0014] Preferably, the front locking inclined surfaces are symmetrically distributed on the left and right side surfaces of the front locking block, and the front locking inclined surfaces are also symmetrically distributed on the left and right side surfaces of the rear locking block.

[0015] Preferably, a front limiting block is provided on the front locking block, and at least one of the left and right tensioning blocks is provided with a front limiting groove. The front limiting block extends into the front limiting groove, and the front limiting block can move axially along the cylinder in the front limiting groove; a rear limiting block is provided on the rear locking block, and at least one of the left and right tensioning blocks is provided with a rear limiting groove. The rear limiting block extends into the rear limiting groove, and the rear limiting block can move axially along the cylinder in the front limiting groove. Thus, when the cylinder drives the rear locking block away from the front locking block to unlock the core cutter, when the rear limiting block abuts against the end of the rear limiting groove, the rear locking block stops moving; thereafter, the front locking block, the floating seat and the cylinder will move away from the front limiting block, so that the front locking block is separated from the left and right tensioning blocks, ensuring the unlocking of the core cutter and enabling the core cutter to be disassembled smoothly.

[0016] Preferably, the core cutter installation groove penetrates through the core cutter installation seat, and the length direction of the core cutter installation groove is parallel to the axial direction of the cylinder.

[0017] Preferably, one of the left and right tensioning blocks faces the core cutter, and a plurality of grooves are provided on the side surface of the tensioning block facing the core cutter.

[0018] Preferably, the front locking block is fixed on the floating seat by bolts.

[0019] Preferably, the cylinder is fixed on the floating seat by bolts.

[0020] The beneficial effects of the present invention are as follows: It can realize the automatic locking and fixing of the core cutter. Not only is the installation of the core cutter convenient and the installation efficiency high, but also the front and rear locking blocks are used to push and drive the left and right tensioning blocks to expand, so as to lock and fix the core cutter, making the installation of the core cutter more stable and reliable. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of an automatic clamping device for a spring core cutter according to the first specific embodiment of the present invention.

[0022] Figure 2 It is a schematic structural diagram of an automatic clamping device for a spring core cutter according to the second specific embodiment of the present invention.

[0023] Figure 3 It is a schematic structural diagram of an automatic clamping device for a spring core cutter according to the third specific embodiment of the present invention.

[0024] In the figure:

[0025] Core cutter installation seat 1;

[0026] Core cutter 2;

[0027] Bi-directional tensioning device 3, floating seat 3.1, cylinder 3.2, left tensioning block 3.3a, right tensioning block 3.3b, front locking block 3.4a, rear locking block 3.4b, rear locking inclined surface 3.5, rear tensioning inclined surface 3.6, front locking inclined surface 3.7, front tensioning inclined surface 3.8, drive rod 3.9, drive rod through-hole 3.10, rear limit groove 3.11, rear limit block 3.12, front limit groove 3.13, front limit block 3.14, tension spring 3.15, accommodation hole 3.16, pre-tightening compression spring 3.17, rear limit block 3.18, rear through-hole 3.19, front limit block 3.20, end stop 3.21. Detailed implementation mode

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and the specific implementation mode:

[0029] Specific embodiment 1: As Figure 1 shown, an automatic clamping device for a spring core cutter includes a core cutter mounting seat 1, a core cutter 2 and a bi-directional tensioning device 3. A core cutter mounting groove is provided on the core cutter mounting seat. The core cutter is placed in the core cutter mounting groove.

[0030] The bi-directional tensioning device 3 is used to lock and fix the core cutter in the core cutter mounting groove. The bi-directional tensioning device 3 includes a floating seat 3.1, a cylinder 3.2 fixed on the floating seat, two left and right tensioning blocks 3.3a, 3.3b located in the core cutter mounting groove, and two front and rear locking blocks 3.4a, 3.4b located between the two left and right tensioning blocks. In this embodiment, the core cutter mounting groove penetrates the core cutter mounting seat, and the length direction of the core cutter mounting groove is parallel to the axial direction of the cylinder. The two front and rear locking blocks are distributed along the axial direction of the cylinder. The two left and right tensioning blocks are distributed along the width direction of the core cutter mounting groove. The two left and right tensioning blocks are located on the same side of the core cutter. The front locking block 3.4a is fixed on the floating seat. In this embodiment, the front locking block is fixed on the floating seat by bolts, and the cylinder is fixed on the floating seat by bolts. Front locking inclined surfaces 3.7 are provided on the left and right side surfaces of the front locking block facing the two left and right tensioning blocks, and front tensioning inclined surfaces 3.8 matching the front locking inclined surfaces are provided on the two left and right tensioning blocks. Rear locking inclined surfaces 3.5 are provided on the left and right side surfaces of the rear locking block facing the two left and right tensioning blocks, and rear tensioning inclined surfaces 3.6 matching the rear locking inclined surfaces are provided on the two left and right tensioning blocks.

[0031] The cylinder is used to drive the rear locking block to approach or move away from the front locking block. In the process of the cylinder driving the rear locking block to approach the front locking block, the two front and rear locking blocks will push and drive the two left and right tensioning blocks to expand, so as to lock and fix the core cutter in the core cutter mounting groove. In this way, the core cutter is automatically locked and fixed in the core cutter mounting groove, which is not only convenient for installing the core cutter and has high installation efficiency; moreover, the two front and rear locking blocks push and drive the two left and right tensioning blocks to expand to lock and fix the core cutter, making the installation of the core cutter more stable and reliable.

[0032] In this embodiment, the front locking inclined surfaces are symmetrically distributed on the left and right sides of the front locking block, and the front locking inclined surfaces are also symmetrically distributed on the left and right sides of the rear locking block. The left and right tensioning blocks are symmetrically distributed along the axial direction of the cylinder. The axial direction of the cylinder is horizontally distributed. A cover plate is further provided on the core cutter mounting seat, and the cover plate is connected to the core cutter mounting seat by bolts, and the cover plate seals the notch of the core cutter mounting groove.

[0033] Further, as Figure 1 shown, the inclination angle of the front locking inclined surface 3.7 is less than the equivalent friction angle, and the inclination angle of the rear locking inclined surface 3.5 is less than the equivalent friction angle. During the use of the automatic clamping device for the spring core cutter, if the cylinder leaks, since the inclination angle of the front locking inclined surface is less than the equivalent friction angle and the inclination angle of the rear locking inclined surface is less than the equivalent friction angle, thus, when the two tensioning blocks are only subjected to the extrusion force that makes the two tensioning blocks approach each other, the front and rear locking blocks can remain stationary, so as to keep the core cutter in a locked state, effectively improving the problem that the core cutter becomes loose due to the leakage of the cylinder.

[0034] Further, as Figure 1 shown, a front limiting block 3.14 is provided on the front locking block, and at least one of the left and right tensioning blocks is provided with a front limiting groove 3.13, and the front limiting groove extends along the axial direction of the cylinder. The front limiting block extends into the front limiting groove, and the front limiting block can move along the axial direction of the cylinder in the front limiting groove. In this embodiment, there are two front limiting blocks on the front locking block, and the left and right tensioning blocks are both provided with front limiting grooves. The front limiting blocks on the front locking block correspond to the front limiting grooves one by one, and the front limiting blocks extend into the corresponding front limiting grooves. A rear limiting block 3.12 is provided on the rear locking block, and at least one of the left and right tensioning blocks is provided with a rear limiting groove 3.11, and the rear limiting groove extends along the axial direction of the cylinder. The rear limiting block extends into the rear limiting groove, and the rear limiting block can move along the axial direction of the cylinder in the front limiting groove. In this embodiment, there are two rear limiting blocks on the rear locking block, and the left and right tensioning blocks are both provided with rear limiting grooves. The rear limiting blocks on the rear locking block correspond to the rear limiting grooves one by one, and the rear limiting blocks extend into the corresponding rear limiting grooves. Thus, during the process of the cylinder driving the rear locking block away from the front locking block to unlock the core cutter, when the rear limiting block abuts against the end of the rear limiting groove, the rear locking block stops moving; thereafter, the front locking block, the floating seat and the cylinder will move away from the front limiting block, so that the front locking block is separated from the left and right tensioning blocks, ensuring the unlocking of the core cutter and enabling the core cutter to be disassembled smoothly.

[0035] Further, one of the left and right tensioning blocks faces the core cutter, and a plurality of grooves are provided on the side of this tensioning block facing the core cutter. Thus, after the tensioning block locks and fixes the core cutter in the core cutter mounting groove, it is beneficial to improve the installation stability and reliability of the core cutter.

[0036] Further, as Figure 1As shown, the bi-directional tensioning device further includes a drive rod 3.9. The drive rod is coaxially distributed with the cylinder. A drive rod through-hole 3.10 is provided on the front locking block. One end of the drive rod is connected to the piston rod of the cylinder, and the other end of the drive rod passes through the drive rod through-hole and is connected to the rear locking block. In this way, not only can the cylinder drive the rear locking block to approach or move away from the front locking block, but also the structure is compact, which is beneficial to reducing the volume of the automatic clamping device for the spring core cutter.

[0037] Specific Embodiment 2: The rest of the structure of this embodiment refers to Specific Embodiment 1, and the difference is that

[0038] As Figure 2 shown, a tension spring 3.15 is further provided between the front and rear locking blocks 3.4a and 3.4b. One end of the tension spring is connected to the front locking block, and the other end of the tension spring is connected to the rear locking block. The tension spring is used to provide a pulling force to make the front and rear locking blocks approach each other. In this way, during the use of the automatic clamping device for the spring core cutter, if the cylinder leaks, the tension spring can also provide a pulling force to make the front and rear locking blocks approach each other, keep the left and right tensioning blocks open, and lock and fix the core cutter in the core cutter installation groove; thus improving the problem that the core cutter loosens due to the leakage of the cylinder.

[0039] Specific Embodiment 3: The rest of the structure of this embodiment refers to Specific Embodiment 1, and the difference is that

[0040] As Figure 3 shown, an automatic clamping device for a spring core cutter includes a core cutter mounting seat 1, a core cutter 2 and a bi-directional tensioning device 3. A core cutter installation groove is provided on the core cutter mounting seat. The core cutter is placed in the core cutter installation groove.

[0041] The bi-directional tensioning device 3 is used to lock and fix the core cutter in the core cutter installation groove. The bi-directional tensioning device 3 includes a floating seat 3.1, a cylinder 3.2 fixed on the floating seat, left and right tensioning blocks 3.3a and 3.3b located in the core cutter installation groove, and front and rear locking blocks 3.4a and 3.4b located between the left and right tensioning blocks. In this embodiment, the core cutter installation groove penetrates the core cutter mounting seat, and the length direction of the core cutter installation groove is parallel to the axial direction of the cylinder. The front and rear locking blocks are distributed along the axial direction of the cylinder. The left and right tensioning blocks are distributed along the width direction of the core cutter installation groove. The left and right tensioning blocks are located on the same side of the core cutter. The front locking block 3.4a is fixed on the floating seat. In this embodiment, the front locking block is fixed on the floating seat by bolts, and the cylinder is fixed on the floating seat by bolts. Front locking inclined surfaces 3.7 are provided on the left and right side surfaces of the front locking block facing the left and right tensioning blocks, and front tensioning inclined surfaces 3.8 are provided on the left and right tensioning blocks to cooperate with the front locking inclined surfaces. Rear locking inclined surfaces 3.5 are provided on the left and right side surfaces of the rear locking block facing the left and right tensioning blocks, and rear tensioning inclined surfaces 3.6 are provided on the left and right tensioning blocks to cooperate with the rear locking inclined surfaces.

[0042] The air cylinder is used to drive the rear locking block to approach or move away from the front locking block. During the process that the air cylinder drives the rear locking block to approach the front locking block, the front and rear locking blocks will push to drive the left and right tensioning blocks to expand, so as to lock and fix the core cutter in the core cutter installation groove. In this way, the core cutter is automatically locked and fixed in the core cutter installation groove, which is not only convenient for installing the core cutter and has high installation efficiency; moreover, the front and rear locking blocks will push to drive the left and right tensioning blocks to expand to lock and fix the core cutter, making the installation of the core cutter more stable and reliable.

[0043] In this embodiment, the front locking inclined surfaces are symmetrically distributed on the left and right side surfaces of the front locking block, and the front locking inclined surfaces are also symmetrically distributed on the left and right side surfaces of the rear locking block. The left and right tensioning blocks are symmetrically distributed along the axial direction of the air cylinder. The axial direction of the air cylinder is horizontally distributed. A cover plate is further provided on the core cutter mounting seat, and the cover plate is connected to the core cutter mounting seat by bolts, and the cover plate covers the notch of the core cutter installation groove.

[0044] Further, as Figure 3 shown, the inclination angle of the front locking inclined surface 3.7 is less than the equivalent friction angle, and the inclination angle of the rear locking inclined surface 3.5 is less than the equivalent friction angle. During the use of the automatic clamping device for the spring core cutter, if the air cylinder leaks, since the inclination angle of the front locking inclined surface is less than the equivalent friction angle and the inclination angle of the rear locking inclined surface is less than the equivalent friction angle, in this way, when the two tensioning blocks are only subjected to the extrusion force that makes the two tensioning blocks approach each other, the front and rear locking blocks can remain stationary, so as to keep the core cutter in a locked state, effectively improving the problem that the core cutter becomes loose due to the leakage of the air cylinder.

[0045] Further, as Figure 3As shown in the figure, a front limit block 3.14 is provided on the front locking block, and at least one of the left and right tensioning blocks is provided with a front limit groove 3.13, and the front limit groove extends along the axial direction of the cylinder. The front limit block extends into the front limit groove, and the front limit block can move along the axial direction of the cylinder in the front limit groove. In this embodiment, there are two front limit blocks on the front locking block, and front limit grooves are provided on both the left and right tensioning blocks. The front limit blocks on the front locking block correspond to the front limit grooves one by one, and the front limit blocks extend into the corresponding front limit grooves. A rear limit block 3.12 is provided on the rear locking block, and at least one of the left and right tensioning blocks is provided with a rear limit groove 3.11, and the rear limit groove extends along the axial direction of the cylinder. The rear limit block extends into the rear limit groove, and the rear limit block can move along the axial direction of the cylinder in the front limit groove. In this embodiment, there are two rear limit blocks on the rear locking block, and rear limit grooves are provided on both the left and right tensioning blocks. The rear limit blocks on the rear locking block correspond to the rear limit grooves one by one, and the rear limit blocks extend into the corresponding rear limit grooves. In this way, when the cylinder drives the rear locking block away from the front locking block to unlock the core cutter, when the rear limit block abuts against the end of the rear limit groove, the rear locking block stops moving; thereafter, the front locking block, the floating seat and the cylinder will move away from the front limit block, so that the front locking block is separated from the left and right tensioning blocks, ensuring the unlocking of the core cutter and enabling the core cutter to be disassembled smoothly.

[0046] Furthermore, one of the left and right tensioning blocks faces the core cutter, and a plurality of grooves are provided on the side surface of this tensioning block facing the core cutter. In this way, after the tensioning block locks and fixes the core cutter in the core cutter installation groove, it is beneficial to improve the installation stability and reliability of the core cutter.

[0047] Furthermore, as Figure 3As shown in the figure, the bi-directional tensioning device further includes a driving rod 3.9 and a pre-tightening compression spring 3.17. The driving rod is coaxially distributed with the cylinder. A driving rod through-hole 3.10 is provided on the front locking block. An accommodating hole 3.16 is provided at one end of the rear locking block facing away from the front locking block, and a rear through-hole 3.19 is provided on the inner end surface of the accommodating hole. In this embodiment, the accommodating hole, the rear through-hole and the driving rod are coaxially distributed. The inner diameter of the rear through-hole is smaller than the inner diameter of the accommodating hole. One end of the driving rod is connected to the piston rod of the cylinder, and the other end of the driving rod sequentially passes through the driving rod through-hole and the rear through-hole and extends into the accommodating hole. An end stop 3.21 is provided at the other end of the driving rod. A front limit block 3.20 and a rear limit block 3.18 are provided on the driving rod. The front limit block is located between the front and rear locking blocks, and the rear limit block is located in the accommodating hole. The pre-tightening compression spring is sleeved on the driving rod. One end of the pre-tightening compression spring abuts against the inner end surface of the accommodating hole, and the other end of the pre-tightening compression spring abuts against the end stop. In this way, not only can the cylinder drive the rear locking block to approach or move away from the front locking block, but also the structure is compact, which is beneficial to reducing the volume of the automatic clamping device for the spring core cutter. More importantly, during the use of the automatic clamping device for the spring core cutter, if the cylinder leaks slightly, the pre-tightening compression spring can also provide a pre-pressure to make the front and rear locking blocks approach each other, keep the left and right tensioning blocks open, and lock the core cutter in the core cutter installation groove; thus improving the problem that the core cutter loosens due to the leakage of the cylinder.

[0048] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes and equivalent transformations made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. An automatic clamping device for a spring core cutter, Characterized in that, Comprising: A core cutter mounting seat provided with a core cutter mounting groove; A core cutter placed in the core cutter mounting groove; A two-way tensioning device for locking and fixing the core cutter in the core cutter mounting groove, including a floating seat, a cylinder fixed on the floating seat, a driving rod, a pre-tightening compression spring, two left and right tensioning blocks located in the core cutter mounting groove, and two front and rear locking blocks located between the two left and right tensioning blocks. The two front and rear locking blocks are distributed along the axial direction of the cylinder. The two left and right tensioning blocks are on the same side of the core cutter. The front locking block is fixed on the floating seat. The cylinder is used to drive the rear locking block to approach or move away from the front locking block. During the process of the cylinder driving the rear locking block to approach the front locking block, the two front and rear locking blocks will push the two left and right tensioning blocks to expand, so as to lock and fix the core cutter in the core cutter mounting groove; The front locking block is provided with a driving rod through hole. One end of the rear locking block facing away from the front locking block is provided with a receiving hole. The inner end surface of the receiving hole is provided with a rear through hole. One end of the driving rod is connected to the piston rod of the cylinder. The other end of the driving rod sequentially passes through the driving rod through hole and the rear through hole and extends into the receiving hole. The other end of the driving rod is provided with an end stop block. The driving rod is provided with a front limit block and a rear limit block. The front limit block is located between the two front and rear locking blocks. The rear limit block is located in the receiving hole. The pre-tightening compression spring is sleeved on the driving rod. One end of the pre-tightening compression spring abuts against the inner end surface of the receiving hole, and the other end of the pre-tightening compression spring abuts against the end stop block.

2. The automatic clamping device for a spring core cutter according to claim 1, Characterized in that, The driving rod and the cylinder are coaxially distributed.

3. The automatic clamping device for a spring core cutter according to claim 1 or 2, Characterized in that, The left and right side surfaces of the front locking block facing the two left and right tensioning blocks are both provided with front locking inclined surfaces, and the two left and right tensioning blocks are both provided with front tensioning inclined surfaces that cooperate with the front locking inclined surfaces; the left and right side surfaces of the rear locking block facing the two left and right tensioning blocks are both provided with rear locking inclined surfaces, and the two left and right tensioning blocks are both provided with rear tensioning inclined surfaces that cooperate with the rear locking inclined surfaces.

4. The automatic clamping device for a spring core cutter according to claim 3, Characterized in that, The inclination angle of the front locking inclined surface is less than the equivalent friction angle, and the inclination angle of the rear locking inclined surface is less than the equivalent friction angle.

5. The automatic clamping device for a spring core cutter according to claim 3, Characterized in that, The front locking inclined surfaces on the left and right side surfaces of the front locking block are symmetrically distributed, and the rear locking inclined surfaces on the left and right side surfaces of the rear locking block are also symmetrically distributed.

6. The automatic clamping device for a spring core cutter according to claim 1 or 2, Characterized in that, The front locking block is provided with a front limit block I. At least one of the two left and right tensioning blocks is provided with a front limit groove. The front limit block I extends into the front limit groove, and the front limit block I can move along the axial direction of the cylinder in the front limit groove; the rear locking block is provided with a rear limit block I. At least one of the two left and right tensioning blocks is provided with a rear limit groove. The rear limit block I extends into the rear limit groove, and the rear limit block I can move along the axial direction of the cylinder in the front limit groove.

7. The automatic clamping device for a spring core cutter according to claim 1 or 2, Characterized in that, The core cutter mounting groove penetrates through the core cutter mounting seat, and the length direction of the core cutter mounting groove is parallel to the axial direction of the cylinder.

8. The automatic clamping device for the spring core cutter according to claim 1 or 2, Characterized in that, The front locking block is fixed on the floating seat by bolts.

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