Four-axis elastic clamping device

Abstract

The utility model discloses a four -axis elastic clamping device, including the jaw mounting plate, a pair of jaws, clamp die mounting seat and elastic clamp die, a pair of jaw installation holes are set up on the jaw mounting plate, a pair of jaws are respectively worn in the jaw installation hole and the middle part rotation is connected to form the lever structure, and the lower end is used for connecting the power input mechanism, and the upper end forms the mouth of clamping, the clamp die mounting seat is located in a pair of jaws middle and is set up on the jaw mounting plate, and elastic clamp die is detachably connected on the clamp die mounting seat and is located between the upper end of a pair of jaws, and the workpiece fixing hole of axis vertical with the rotation plane of jaw is set up on elastic clamp die, and the slit of communicating with the space above elastic clamp die is set up on the workpiece fixing hole. The device is mainly used for clamping the workpiece such as valve core base in four -axis machining, realizes even clamping force, reduces the surface damage, improves the clamping efficiency and stability.

Description

Technical Field

[0001] This utility model relates to the field of machining fixtures. More specifically, this utility model relates to a four-axis elastic clamping device. Background Technology

[0002] For a type of valve core base that is machined by a turning machine, multiple straight and oblique holes need to be machined on the top and bottom. When machining on a four-axis machine, the valve core base needs to be machined to a smooth surface first. When machining with a conventional clamping method, slippage and rotation are likely to occur. If the clamping force is too large, it may cause indentations or damage to the workpiece surface, especially for some workpieces with softer texture or high surface precision requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a four-axis elastic clamping device that uses an elastic mold wrapping method to distribute the clamping force more evenly on the workpiece, reducing localized pressure on the workpiece surface and thus lowering the risk of surface damage. Simultaneously, even with minor variations in workpiece dimensions, the elastic mold maintains good clamping performance, preventing significant changes in clamping force due to slight differences in workpiece size, ensuring stable and reliable clamping.

[0004] To achieve these objectives and other advantages according to the present invention, a four-axis elastic clamping device is provided, comprising: A gripper mounting plate, wherein a pair of gripper mounting holes are provided on the gripper mounting plate; A pair of grippers are respectively inserted into a pair of gripper mounting holes. The middle part of the grippers is rotatably connected in the gripper mounting holes to form a lever structure. The lower end of the pair of grippers is used to connect to a power input mechanism. The upper end of the pair of grippers forms a clamping opening. When the lower ends of the pair of grippers are close to each other, the upper ends of the pair of grippers are far apart. When the lower ends of the pair of grippers are far apart, the upper ends of the pair of grippers are close to each other. A clamping mold mounting base is disposed on a jaw mounting plate and located between a pair of jaws; An elastic clamping mold is detachably connected to the clamping mold mounting base and located between the upper ends of a pair of clamping jaws. The elastic clamping mold has a workpiece fixing hole with its axis perpendicular to the rotation plane of the clamping jaws. The workpiece fixing hole has a slit communicating with the space above the elastic clamping mold. When the upper ends of the pair of clamping jaws approach each other, they press the elastic clamping mold to close the slit, thereby clamping the valve core base to be processed into the workpiece fixing hole.

[0005] Preferably, the elastic clamping mold is provided with a guide hole that passes through the slit and extends to the two sides of the elastic clamping mold that are clamped by a pair of jaws, and a guide rod adapted to the guide hole passes through the guide hole.

[0006] Preferably, the workpiece fixing holes are provided in an even number, and the even number of workpiece fixing holes are symmetrically distributed on both sides of the longitudinal central axis surface of a pair of grippers.

[0007] Preferably, the even number of workpiece fixing holes are arranged in a rectangular array, the slits of the lower workpiece fixing holes are connected to the workpiece fixing holes above them, the slits of the uppermost workpiece fixing holes are connected to the space above the elastic clamping mold, and the guide hole passes through the slits of the uppermost workpiece fixing holes.

[0008] Preferably, the workpiece fixing holes are provided in an odd number, and the axes of the odd number of workpiece fixing holes are all located on the longitudinal central axis surface of a pair of grippers from top to bottom. The guide hole passes through the slit of the uppermost workpiece fixing hole.

[0009] Preferably, the elastic clamping mold has guide grooves running from top to bottom on both sides of the clamping surfaces held by a pair of jaws, and each of the clamping surfaces of the jaws that are used to contact the elastic clamping mold has a limiting block that matches the width of the guide groove.

[0010] Preferably, the clamping mold mounting base has a stepped through hole, the small diameter end of the stepped through hole is located on the top surface of the clamping mold mounting base, and the bottom surface of the elastic clamping mold has a threaded countersunk hole aligned with the small diameter end of the stepped through hole. Bolts for connecting the clamping mold mounting base and the elastic clamping mold are provided in the stepped through hole and the threaded countersunk hole.

[0011] Preferably, the clamping mold mounting base has a positioning through hole, and the bottom surface of the elastic clamping mold has a positioning countersunk hole aligned with the positioning through hole. Positioning pins for positioning the elastic clamping mold are provided in the positioning through hole and the positioning countersunk hole.

[0012] This utility model has at least the following beneficial effects: 1. The flexible clamping mold wrapping method ensures that the clamping force is applied more evenly to the workpiece, reducing localized pressure on the workpiece surface and thus lowering the risk of surface damage. Furthermore, even with minor variations in workpiece dimensions, the flexible clamping mold maintains good clamping performance, preventing significant changes in clamping force due to slight differences in workpiece size, ensuring stable and reliable clamping. 2. The clamping process is usually simple and quick. Simply place the workpiece into the workpiece fixing hole of the elastic clamping mold, and the left and right jaws close and clamp it. There is no need to manually move the moving mold. After processing, the left and right jaws open, and the elastic clamping mold automatically releases to remove the workpiece. Due to its high clamping efficiency, it can reduce the time cost in the production process to a certain extent. 3. The structure of the elastic clamping mold is relatively simple, with an integrated structure that can be obtained by CNC machining in one step, resulting in relatively low manufacturing costs; 4. Workpieces requiring surface polishing and electroplating can be produced in multiple cavities using a single mold, greatly improving production efficiency.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the four-axis elastic clamping device described in this utility model; Figure 2 This is a schematic diagram of the internal structure of the four-axis elastic clamping device of this utility model. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0016] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figures 1-2 As shown, this utility model provides a four-axis elastic clamping device, comprising: A gripper mounting plate 1, wherein a pair of gripper mounting holes 2 are provided on the gripper mounting plate 1; A pair of grippers 3 are respectively inserted into a pair of gripper mounting holes 2. The middle part of the gripper 3 is rotatably connected in the gripper mounting holes 2 to form a lever structure. The lower end of the pair of grippers 3 is used to connect to the power input mechanism. The upper end of the pair of grippers 3 forms a clamping opening. When the lower ends of the pair of grippers 3 are close to each other, the upper ends of the pair of grippers 3 are far apart. When the lower ends of the pair of grippers 3 are far apart, the upper ends of the pair of grippers 3 are close to each other. The clamping mold mounting base 4 is disposed on the clamping jaw mounting plate 1 and located between a pair of clamping jaws 3; The elastic clamping mold 5 is detachably connected to the clamping mold mounting base 4 and located between the upper ends of a pair of clamping jaws 3. The elastic clamping mold 5 has a workpiece fixing hole 6 with its axis perpendicular to the rotation plane of the clamping jaws 3. The workpiece fixing hole 6 has a slit 7 that communicates with the space above the elastic clamping mold 5. When the upper ends of the pair of clamping jaws 3 approach each other, they press the elastic clamping mold 5 to close the slit 7, thereby clamping the valve core base to be processed into the workpiece fixing hole 6.

[0018] The four-axis elastic clamping device is mainly used to solve the problems of slippage, surface indentation, or damage to workpieces such as valve core bases caused by improper clamping during four-axis machining. This device achieves uniform clamping through the wrapping method of the elastic clamping mold 5, and is suitable for workpieces with smooth surfaces, soft textures, or high precision requirements.

[0019] The gripper mounting plate 1 serves as a basic support component, and it has a pair of gripper mounting holes 2 for mounting and fixing the grippers 3. The gripper mounting plate 1 is usually made of a sturdy material to ensure the stability of the overall structure.

[0020] A pair of grippers 3 are respectively inserted into gripper mounting holes 2, and the middle of the grippers 3 is rotatably connected to form a lever structure. The lower end of the grippers 3 is connected to a power input mechanism, such as a pneumatic or hydraulic drive device, and the upper end forms a clamping opening. When the power input mechanism pushes the lower ends of the grippers 3 closer together, the upper ends of the grippers 3 will move away from each other; conversely, when the lower ends of the grippers 3 move away from each other, the upper ends will move closer together. This lever principle realizes the transmission and direction conversion of clamping force.

[0021] The clamping mold mounting base 4 is mounted on the jaw mounting plate 1, located between a pair of jaws 3, and is used to mount the elastic clamping mold 5. The clamping mold mounting base 4 is usually connected to the jaw mounting plate 1 by bolts or locating pins to ensure accurate positioning.

[0022] The elastic clamping mold 5 is detachably connected to the clamping mold mounting base 4 and located between the upper ends of the grippers 3. The elastic clamping mold 5 has a workpiece fixing hole 6, the axis of which is perpendicular to the rotation plane of the grippers 3. A slit 7 is provided in the workpiece fixing hole 6, which communicates with the space above the elastic clamping mold 5. When the upper ends of the grippers 3 approach each other, they press against the elastic clamping mold 5, causing the slit 7 to close, thereby clamping the workpiece within the workpiece fixing hole 6. The elastic clamping mold 5 is typically made of an elastic material such as spring steel and has a certain degree of deformation capability.

[0023] For example, when machining a valve core base, after the workpiece is placed into the workpiece fixing hole 6, the upper end of the gripper 3 moves inward under power drive, squeezing the elastic clamping mold 5. The slit 7 gradually closes, wrapping and fixing the workpiece. Because the clamping force is evenly distributed through the elastic clamping mold 5, excessive local pressure is avoided, protecting the workpiece surface.

[0024] The process involves placing the workpiece into the workpiece fixing hole 6 of the elastic clamping mold 5, activating the power input mechanism to move the lower ends of the grippers 3 away from each other, thereby causing the upper ends of the grippers 3 to move closer together and press against the elastic clamping mold 5, achieving clamping. After processing, the power input mechanism moves in the opposite direction, the upper ends of the grippers 3 move away from each other, and the elastic clamping mold 5 returns to its original shape due to its own elasticity, releasing the workpiece for easy removal.

[0025] The main technical advantages of this device are: uniform clamping force, reducing workpiece surface damage; adaptability to small variations in workpiece size, maintaining stable clamping; quick clamping process, improving production efficiency; and simple structure and low manufacturing cost of the elastic clamping mold 5, which supports multi-cavity processing and further optimizes the production process.

[0026] Furthermore, the elastic clamping mold 5 is provided with a guide hole that passes through the slit 7 and extends to the two sides of the elastic clamping mold 5 that are clamped by a pair of jaws 3. A guide rod 8 that is adapted to the guide hole passes through the guide hole.

[0027] The guide hole passes laterally through the slit 7, and its two ends extend to the two sides of the elastic mold 5 that are held by a pair of jaws 3. A guide rod 8, matching the size of the hole, passes through this guide hole. The function of the guide rod 8 is to guide the elastic mold 5 to deform in a predetermined direction when it is compressed, preventing it from producing irregular twisting or displacement.

[0028] For example, when the upper ends of the grippers 3 approach each other and compress the elastic mold 5, the material of the elastic mold 5 will be stressed, causing the slit 7 to close. Without the guide rod 8, the mold may not be able to accurately reset due to plastic deformation after multiple uses, or the closing action of the slit 7 may be inconsistent. The presence of the guide rod 8 provides a physical constraint and sliding track for the deformation of the elastic mold 5, ensuring that in each clamping action, the slit 7 closes uniformly and symmetrically along the axis of the guide rod 8, thereby making the distribution of clamping force acting on the workpiece more controllable and consistent.

[0029] During operation, the operator places the workpiece into the workpiece fixing hole 6 and then drives the gripper 3 to move. While the gripper 3 presses against the elastic mold 5, the guide rod 8 slides within the guide hole, guiding the two parts of the elastic mold 5 to move relative to each other around the guide rod 8, thus achieving the smooth closing of the slit 7. After processing, the gripper 3 releases, and the elastic mold 5 returns to its original shape due to its own elasticity. During this process, the guide rod 8 also plays a guiding and resetting role, ensuring that the slit 7 is fully open for the next clamping.

[0030] This structure significantly improves the repeatability and reliability of clamping. It effectively prevents workpiece positioning errors caused by the deflection of the elastic clamping mold 5, making it particularly suitable for processes requiring high machining position accuracy. Simultaneously, the guiding structure extends the service life of the elastic clamping mold 5 by reducing fatigue damage caused by irregular stress concentrations, ensuring that the clamping force acts stably on the workpiece over a long period.

[0031] Furthermore, the workpiece fixing holes 6 are provided in an even number, and the even number of workpiece fixing holes 6 are symmetrically distributed on both sides of the longitudinal central axis surface of a pair of grippers 3.

[0032] The number of workpiece fixing holes 6 is even, and they are symmetrically distributed on both sides of the longitudinal central axis of the pair of grippers 3. This symmetrical layout ensures that the clamping force applied by the grippers 3 is evenly transmitted to each workpiece fixing hole 6 located on both sides of the central axis. For example, when four workpiece fixing holes 6 are provided, they can be arranged in pairs on the left and right sides of the central axis, forming a stable rectangular array. This arrangement ensures that the elastic mold 5 is subjected to balanced forces during clamping, without generating additional torque, thus guaranteeing the stability of the clamping.

[0033] Furthermore, the even number of workpiece fixing holes 6 are arranged in a rectangular array. The slit 7 of the lower workpiece fixing hole 6 is connected to the workpiece fixing hole 6 above it. The slit 7 of the uppermost workpiece fixing hole 6 is connected to the space above the elastic clamping mold 5. The guide hole passes through the slit 7 of the uppermost workpiece fixing hole 6.

[0034] When there are an even number of workpiece fixing holes 6 and they are arranged in a rectangular array, their slits 7 employ a special interconnection design. Specifically, the slits 7 of the lower workpiece fixing holes 6 are connected to the workpiece fixing holes 6 directly above them, while the slits 7 of the uppermost workpiece fixing holes 6 are directly connected to the space above the elastic clamping mold 5. Simultaneously, the guide holes are configured to traverse the slits 7 of the uppermost workpiece fixing holes 6. Taking a four-hole layout as an example, counting from top to bottom, the slits 7 of the first hole and the second hole in each column are connected, while the slit 7 of the topmost hole opens upwards. The guide rod 8 passes through the very top of this interconnected slit system 7.

[0035] In use, the operator can place multiple workpieces, such as four valve core bases, into the four workpiece fixing holes 6 respectively. When the power mechanism drives the upper ends of the grippers 3 to approach each other and press against the elastic clamping mold 5, the clamping force is transmitted from the top two sides where the elastic clamping mold 5 contacts the grippers 3. Since the slits 7 are connected vertically, this clamping force is transmitted sequentially from top to bottom along the connected slits 7, causing all the slits 7 from the top to the bottom to close almost synchronously and uniformly, thus clamping the four workpieces at the same time. The guide rod 8 is crucial in this process; it constrains the deformation trajectory of the uppermost slit 7, thereby guiding and stabilizing the closing behavior of the entire lower slit chain 7, preventing over-closure or under-closure of any slit 7 due to stress concentration. Some softer workpieces or those requiring high surface precision can be processed using a two-cavity mold, while those requiring surface polishing and electroplating can be processed using a four-cavity mold.

[0036] This design achieves truly efficient multi-cavity machining with a single mold, allowing for the processing of multiple workpieces in a single clamping operation, significantly improving production efficiency. The interconnected slit structure 7 ensures smoother and more consistent transmission of clamping force, guaranteeing uniform clamping force on all workpieces and avoiding machining accuracy issues caused by differences in clamping force. The positioning of the uppermost slit 7 by the guide rod 8 ensures the predictability and repeatability of deformation of the entire elastic clamping mold 5 system, improving the long-term reliability and lifespan of the equipment.

[0037] Furthermore, the workpiece fixing holes 6 are provided in an odd number, and the axes of the odd number of workpiece fixing holes 6 are all located on the longitudinal central axis surface of a pair of grippers 3 from top to bottom. The guide hole passes through the slit 7 of the uppermost workpiece fixing hole 6.

[0038] This embodiment provides a workpiece fixing hole 6 layout scheme different from the previous embodiments. It proposes that the number of workpiece fixing holes 6 can be odd, and the axes of all holes are located on the longitudinal central axis plane of a pair of grippers 3 from top to bottom. At the same time, the guide hole is set as a slit 7 that runs through the uppermost workpiece fixing hole 6.

[0039] In this layout, all workpiece fixing holes 6 are arranged in a single straight row along the longitudinal central axis of the gripper 3. For example, three workpiece fixing holes 6 can be provided, arranged sequentially from top to bottom, with their center lines precisely falling on the longitudinal central axis of the gripper 3. This centrally symmetrical layout ensures that the clamping force applied by the gripper 3 from both sides can act directly and evenly on both sides of this center line, guaranteeing the symmetry of the force distribution.

[0040] The guide rod 8 passes through the slit 7 of the uppermost workpiece fixing hole 6, a design that provides a reference for the deformation of the central row of holes. When the upper ends of the grippers 3 approach each other and compress the elastic mold 5, the guide rod 8 first constrains the closing direction of the uppermost slit 7, ensuring that it can only close smoothly along the axial direction of the rod. Since all the holes are located on the same principal axis of force, and the elastic mold 5 is a single unit, this constraint and clamping force from the top is effectively transmitted downwards along the central axis, causing all the lower slits 7 to close synchronously and uniformly.

[0041] During operation, the operator places the workpieces, such as three valve core bases, into the three vertically arranged workpiece fixing holes 6 in sequence. After starting the equipment, the grippers 3 actuate, applying pressure evenly from both sides. Guided by the guide rod 8, the uppermost slit 7 of the elastic clamping mold 5 begins to close neatly first, followed by the lower slit 7 undergoing coordinated deformation, ultimately clamping the three workpieces simultaneously and stably in the center position. Throughout the process, the workpieces will not deflect due to uneven force.

[0042] This layout offers significant technical advantages. It centrally positions all workpieces along the mechanical centerline of the device, minimizing the path of clamping force and ensuring the most direct application. This greatly guarantees the uniformity of stress on each workpiece, making it particularly suitable for clamping precision workpieces with symmetrical structures or extremely high requirements for center positioning. Compared to side-by-side multi-row layouts, this single-row central layout is more compact, effectively reducing the overall lateral dimensions of the clamping mold. Furthermore, it also enables efficient machining of multiple workpieces at once, combining the advantages of high precision and high efficiency.

[0043] Furthermore, the elastic clamping mold 5 is provided with guide grooves 9 running from top to bottom on both sides of the clamping surfaces held by a pair of jaws 3, and each of the clamping surfaces of the pair of jaws 3 that are used to contact the elastic clamping mold 5 is provided with a limiting block 10 that matches the width of the guide groove 9.

[0044] This embodiment adds a guiding and limiting mechanism to solve the misalignment or rotation problems that may occur during repeated clamping and loosening of the elastic clamping mold 5, thereby improving the long-term stability and repeatability of the clamping.

[0045] Specifically, guide grooves 9 are machined from top to bottom on the two sides of the elastic mold 5 that are held by a pair of grippers 3. Correspondingly, a limiting block 10 that precisely matches the width of the guide groove 9 is provided on the clamping surface where the pair of grippers 3 contacts the elastic mold 5. When the grippers 3 close, the limiting block 10 on them will fit perfectly into the guide groove 9 on the side of the elastic mold 5.

[0046] For example, on an elastic clamping mold 5 with four workpiece fixing holes 6, there is a straight guide groove 9 running vertically through each of its left and right sides. When the gripper 3 moves, the limiting block 10 fixed inside the gripper 3 slides precisely into these guide grooves 9, much like the relationship between a train wheel and a rail. This fit ensures that the force applied by the gripper 3 is strictly limited to the vertical direction, effectively preventing any slight back-and-forth swaying or twisting of the elastic clamping mold 5 when under force.

[0047] During operation, the operator loads the workpiece and starts the equipment. As the upper ends of the grippers 3 approach each other and press against the elastic mold 5, the limiting block 10 is already embedded in the guide groove 9. This ensures that the clamping force is used entirely to induce the expected elastic deformation of the elastic mold 5 to close the slit 7, while avoiding any lateral force that could cause the mold to shift. Throughout the machining process, the position of the elastic mold 5 is strictly constrained, ensuring absolute accuracy in workpiece positioning. After machining is completed, the grippers 3 are released, and the limiting block 10 exits from the guide groove 9. As the elastic mold 5 returns to its original position, its trajectory remains stable due to the previous constraint.

[0048] The technical benefits of this guide and limit mechanism are remarkable. It significantly improves the repeatability of clamping, which is crucial for valve core bases and other workpieces requiring multi-stage, high-precision machining, effectively ensuring the consistency of machining datum for each workpiece in mass production. Secondly, it prevents wear or premature fatigue damage to the elastic clamping mold 5 caused by irregular forces, extending the service life of critical components. Finally, by ensuring the purity of the clamping force direction, it makes the workpiece clamping state more stable and reliable, fundamentally eliminating vibrations or machining errors that may be caused by minute displacement of the fixture during processing.

[0049] Furthermore, the clamping mold mounting base 4 is provided with a stepped through hole 11, the small diameter end of the stepped through hole 11 is located on the top surface of the clamping mold mounting base 4, and the bottom surface of the elastic clamping mold 5 is provided with a threaded countersunk hole 12 aligned with the small diameter end of the stepped through hole 11. Bolts for connecting the clamping mold mounting base 4 and the elastic clamping mold 5 are provided in the stepped through hole 11 and the threaded countersunk hole 12.

[0050] The specific connection structure between the elastic clamping mold 5 and the clamping mold mounting base 4 in the four-axis elastic clamping device is designed to achieve a stable connection and convenient assembly and disassembly.

[0051] The design incorporates a stepped through-hole 11 on the clamping mold mounting base 4. This stepped through-hole 11 is characterized by its smaller diameter end located on the top surface of the clamping mold mounting base 4, while its larger diameter end is located on the bottom surface. Correspondingly, a threaded countersunk hole 12 is formed on the bottom surface of the elastic clamping mold 5, precisely aligned with the smaller diameter end of the stepped through-hole 11. During installation, a bolt is inserted from the bottom of the clamping mold mounting base 4 into the stepped through-hole 11 and screwed into the threaded countersunk hole 12 at the bottom of the elastic clamping mold 5, thus securely connecting the two together.

[0052] A key advantage of this connection method is that it allows for concealed installation of the connectors. Due to the stepped holes, the bolt heads can be fully accommodated within the large-diameter section at the bottom of the clamping mold mounting base 4, without protruding from the base plane. This ensures a flat bottom for the device and prevents interference with its installation and fixation on the worktable. For example, on an elastic clamping mold 5 with four workpiece fixing holes 6, one or two such bolt connection points can provide sufficient connection strength to ensure that the elastic clamping mold 5 will not loosen or shift from the base under repeated clamping forces.

[0053] During use, replacing or maintaining the elastic clamping mold 5 is extremely simple. Maintenance personnel only need to loosen the bolts at the bottom of the clamping mold mounting base 4 to remove the old elastic clamping mold 5. Installing a new elastic clamping mold 5 is also straightforward; simply align it and tighten the bolts from the bottom to secure it. The entire process requires no disassembly of the entire device or complex tools, greatly simplifying the maintenance procedure.

[0054] This connection structure offers several technical advantages. First, it provides reliable connection rigidity, ensuring that the bottom surface of the elastic clamping mold 5 remains tightly fitted to the top surface of the mounting base when subjected to lateral pressure from the grippers 3, preventing wobbling and providing a stable foundation for workpiece processing. Second, the detachable nature of the bolted connection greatly facilitates the replacement of the elastic clamping mold 5, which is crucial for processing different types of workpieces or replacing worn parts, improving the equipment's versatility and maintenance efficiency. Finally, the concealed bolt design maintains the cleanliness and flatness of the device's exterior, avoiding unnecessary structural interference and demonstrating the design's practicality and comprehensiveness.

[0055] Furthermore, the clamping mold mounting base 4 is provided with a positioning through hole 13, and the bottom surface of the elastic clamping mold 5 is provided with a positioning countersunk hole 14 aligned with the positioning through hole 13. Positioning pins for positioning the elastic clamping mold 5 are provided in the positioning through hole 13 and the positioning countersunk hole 14.

[0056] A positioning through hole 13 is made on the clamping mold mounting base 4, and a positioning countersunk hole 14 is machined at the corresponding position on the bottom surface of the elastic clamping mold 5. These two holes must be precisely aligned during assembly. As a key component, the positioning pin is inserted into these aligned holes. By utilizing its precise outer diameter and the tight fit between the hole and the pin, any possibility of horizontal movement between the elastic clamping mold 5 and the mounting base is eliminated, achieving complete circumferential positioning.

[0057] For example, on a rectangular elastic clamping mold 5 with four workpiece fixing holes 6, two such locating pin assemblies are usually set at the diagonal positions of its bottom face. These two locating pins, one far and one near, form a stable "two-point positioning" system. When the elastic clamping mold 5 is placed on the clamping mold mounting base 4, as long as these two locating pins can be smoothly inserted into the corresponding pin holes, it proves that the clamping mold is in the only correct position, and all the workpiece fixing holes 6 on it have established a precise relationship with the machine tool coordinate system.

[0058] During use, when changing the elastic clamping mold 5, the operator first needs to roughly align the positioning countersunk hole 14 at the bottom of the elastic clamping mold 5 with the positioning through hole 13 on the clamping mold mounting base 4. Then, gently tap or push the positioning pin into the positioning countersunk hole 14 at the bottom of the elastic clamping mold 5. During this process, the positioning pin will automatically guide the elastic clamping mold 5 to a precise position on a microscopic scale. Once the positioning pin is fully in place, the elastic clamping mold 5 is precisely fixed. At this point, tighten the connecting bolts from the bottom to complete the entire installation process. For disassembly, first loosen the bolts, and then pull out the elastic clamping mold 5.

[0059] The technical benefits of this positioning mechanism are crucial. Firstly, it ensures the repeatability and accuracy of the elastic clamping mold 5 during mass production or line changeovers, maintaining a consistent machining datum for the workpiece. This is essential for ensuring product interchangeability and processing quality. Secondly, it significantly simplifies the alignment process for operators, reducing reliance on experience and visual inspection, lowering alignment time, and improving mold changeover efficiency. Finally, its division of labor with the bolts (the locating pins handle precise alignment, while the bolts provide clamping force) allows each component to perform optimally, protecting the threads from shear forces and extending the service life of the entire connection.

[0060] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A four-axis elastic clamping device, characterized in that, include: A gripper mounting plate, wherein a pair of gripper mounting holes are provided on the gripper mounting plate; A pair of grippers are respectively inserted into a pair of gripper mounting holes. The middle part of the grippers is rotatably connected in the gripper mounting holes to form a lever structure. The lower end of the pair of grippers is used to connect to a power input mechanism. The upper end of the pair of grippers forms a clamping opening. When the lower ends of the pair of grippers are close to each other, the upper ends of the pair of grippers are far apart. When the lower ends of the pair of grippers are far apart, the upper ends of the pair of grippers are close to each other. A clamping mold mounting base is disposed on a jaw mounting plate and located between a pair of jaws; An elastic clamping mold is detachably connected to the clamping mold mounting base and located between the upper ends of a pair of clamping jaws. The elastic clamping mold has a workpiece fixing hole with its axis perpendicular to the rotation plane of the clamping jaws. The workpiece fixing hole has a slit communicating with the space above the elastic clamping mold. When the upper ends of the pair of clamping jaws approach each other, they press the elastic clamping mold to close the slit, thereby clamping the valve core base to be processed into the workpiece fixing hole.

2. The four-axis elastic clamping device as described in claim 1, characterized in that, The elastic clamping mold is provided with a guide hole that passes through the slit and extends to the two sides of the elastic clamping mold that are clamped by a pair of jaws. A guide rod adapted to the guide hole passes through the guide hole.

3. The four-axis elastic clamping device as described in claim 2, characterized in that, The workpiece fixing holes are provided in an even number, and the even number of workpiece fixing holes are symmetrically distributed on both sides of the longitudinal central axis surface of a pair of grippers.

4. The four-axis elastic clamping device as described in claim 3, characterized in that, An even number of workpiece fixing holes are arranged in a rectangular array. The slits of the lower workpiece fixing holes are connected to the workpiece fixing holes above them. The slits of the uppermost workpiece fixing holes are connected to the space above the elastic clamping mold. The guide hole passes through the slits of the uppermost workpiece fixing holes.

5. The four-axis elastic clamping device as described in claim 2, characterized in that, The workpiece fixing holes are provided in an odd number, and the axes of the odd number of workpiece fixing holes are all located on the longitudinal central axis surface of a pair of grippers from top to bottom. The guide hole passes through the slit of the uppermost workpiece fixing hole.

6. The four-axis elastic clamping device as described in claim 1, characterized in that, The elastic clamping mold has guide grooves running from top to bottom on both sides of the clamping surface held by a pair of jaws, and each of the clamping surfaces of the jaws that are used to contact the elastic clamping mold has a limiting block that matches the width of the guide groove.

7. The four-axis elastic clamping device as described in claim 1, characterized in that, The clamping mold mounting base has a stepped through hole, the small diameter end of the stepped through hole is located on the top surface of the clamping mold mounting base, and the bottom surface of the elastic clamping mold has a threaded countersunk hole aligned with the small diameter end of the stepped through hole. Bolts for connecting the clamping mold mounting base and the elastic clamping mold are provided in the stepped through hole and the threaded countersunk hole.

8. The four-axis elastic clamping device as described in claim 1, characterized in that, The clamping mold mounting base is provided with a positioning through hole, and the bottom surface of the elastic clamping mold is provided with a positioning countersunk hole aligned with the positioning through hole. Positioning pins for positioning the elastic clamping mold are provided in the positioning through hole and the positioning countersunk hole.

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