A rotary clamping device

Abstract

This utility model relates to the field of clamping technology for stamping dies and press tables, and particularly to a rotary clamping device, including a body assembly, a drive rod assembly, a clamping head assembly, and a drive unit. The drive rod assembly is movably disposed within the body assembly along the axial direction, and a helical curved surface is provided on the outer circular surface of the head of the drive rod assembly. The clamping head assembly is partially sleeved on the outer side of the head of the drive rod assembly, and a first rolling element is provided on the inner peripheral wall of the clamping head assembly, which engages with the helical curved surface. When the axial movement of the drive rod assembly reaches its limit, the clamping head assembly is driven to rotate around the axis through the engagement of the helical curved surface and the first rolling element. The helical curved surface of the drive rod head and the first rolling element on the inner wall of the clamping head assembly form a rolling friction pair, reducing the frictional resistance during the movement. This allows the linear motion of the drive rod assembly to be converted into the rotational motion of the clamping head assembly more quickly and smoothly, resulting in less wear and a longer service life.

Description

Technical Field

[0001] This utility model relates to the field of stamping die and press table clamping technology, and in particular to a rotary clamping device. Background Technology

[0002] In automated stamping production, the rapid change and reliable fixation of dies are key to ensuring production efficiency and safety. Traditional die clamping often relies on manual clamps operated by hand, which suffers from low efficiency, high labor intensity, and safety hazards. To address this, automatic clamping devices have emerged. These devices use hydraulic or pneumatic drives to lift and lock the clamping head, thereby replacing manual labor and improving the level of automation. To balance rapid response and large clamping force, a composite drive method combining pneumatic lifting and hydraulic locking has become an effective solution. Such devices typically use a screw mechanism to convert the linear motion of the drive rod into the rotational motion of the clamping head. Although this method achieves basic functionality, its core rotary transmission structure still has inherent defects in practice. Specifically, the lead screw pair (the cooperation between the rotating lead screw and the lead screw nut) used in this existing technology is essentially a sliding friction transmission. This mechanism leads to the following prominent problems: First, the transmission efficiency is low and it is prone to wear. The sliding friction between the threaded surfaces generates significant resistance, resulting in insufficient action response. After long-term use, the increased wear will affect the accuracy of the rotation angle. Second, it has high requirements for lubrication and maintenance. Regular lubrication is required to ensure smooth operation, and in harsh industrial environments, it is prone to jamming due to lubrication failure.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] This invention provides a rotary clamping device, thereby effectively solving the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a rotary clamping device, comprising: a body assembly, a drive rod assembly, a clamping head assembly, and a drive unit; The drive rod assembly is movably disposed within the body assembly along the axial direction, and a helical curved surface is provided on the outer circular surface of the head of the drive rod assembly; The clamping head assembly is partially sleeved on the outer side of the head of the drive rod assembly, and a first rolling element is provided on the inner peripheral wall of the clamping head assembly, the first rolling element cooperating with the helical surface; The drive unit is used to drive the drive rod assembly to move axially. Once the limit is reached, when the drive rod assembly continues to move axially, the clamping head assembly is driven to rotate around its axis through the cooperation of the helical surface and the first rolling element.

[0006] Furthermore, the clamping head assembly includes a T-shaped rod and a bearing structure; One end of the T-shaped rod is provided with a T-shaped head for pressing the mold, and the other end is provided with the bearing structure. A second rolling element is provided between the bearing structure and the T-shaped rod, so that the T-shaped rod can rotate freely relative to the main body assembly.

[0007] Furthermore, a baffle is provided on the end face of the T-shaped rod facing the drive rod assembly; The baffle is used to prevent the drive rod assembly from disengaging from the clamping head assembly, while ensuring effective engagement between the first rolling element and the helical raceway at the head of the clamping head assembly.

[0008] Furthermore, the helical surface is at least one helical raceway machined on the outer surface of the head of the drive rod assembly; One part of the first rolling element is embedded in the clamping head assembly, and the other part is embedded in the helical raceway.

[0009] Furthermore, the helix angle and stroke of the helical raceway are configured such that when the drive rod assembly moves a predetermined stroke, it drives the clamping head assembly to rotate exactly 90°.

[0010] Furthermore, it also includes an elastic element disposed between the head of the drive rod assembly and the clamping head assembly, the elastic element being used to ensure that the relative position of the drive rod assembly and the clamping head assembly remains unchanged.

[0011] Furthermore, the elastic element is a compression spring; When the axial movement of the drive rod assembly reaches the limit, the compression spring is compressed, allowing the drive rod assembly to undergo axial displacement relative to the clamping head assembly, thereby triggering the engagement of the helical surface with the first rolling element and driving the clamping head assembly to rotate.

[0012] Furthermore, the drive unit includes a cylinder drive unit; The drive rod assembly includes a cylinder rod and a cylinder piston disposed at one end of the cylinder rod, the cylinder piston dividing the inner cavity of the body assembly into a first air chamber and a second air chamber. The cylinder drive unit includes a first air port communicating with the first air chamber and a second air port communicating with the second air chamber. The lifting and lowering of the drive rod and the rotation of the clamping head assembly are precisely controlled by controlling the flow direction and pressure change of the air pressure.

[0013] Furthermore, the drive unit also includes a hydraulic drive unit for providing the final clamping force; The hydraulic drive unit includes an oil cavity formed within the body assembly and an oil port communicating with the oil cavity; It also includes a piston assembly slidably disposed within the oil chamber; The piston assembly is located above the clamping head assembly. When oil enters through the oil port, the piston assembly is hydraulically driven to move downward and push the clamping head assembly to perform a clamping action.

[0014] Furthermore, the drive rod assembly is constrained by a guide mechanism to move only axially; The guiding mechanism includes a guide pin disposed on the drive rod assembly and an axial guide groove disposed on the body assembly that cooperates with the guide pin.

[0015] The beneficial effects of this utility model are as follows: This utility model utilizes the cooperation between the helical curved surface and the rolling element to convert the axial movement of the drive rod into the rotational motion of the clamping head, which has the advantages of low frictional resistance, fast response speed, low energy loss, precise and controllable rotation angle, high repeatability, low wear, long service life, and low maintenance cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rotary clamping device. Figure 2 This is a schematic diagram of the clamping head assembly; Figure 3 In order to be in Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the drive rod assembly. Figure 5 This is a schematic diagram of the structure in its initial working state; Figure 6 This is a schematic diagram of the T-shaped rod at the U-shaped notch of the mold in its initial working state. Figure 7 A schematic diagram of the T-shaped rod rising as the first action in the working process; Figure 8This is a schematic diagram of the T-shaped rod rotating 90° as the second action in the working process; Figure 9 A schematic diagram of a T-shaped rod rotated 90° at the U-shaped notch in the mold; Figure 10 A schematic diagram of the structure for the third action in the working process: the T-shaped rod descending and clamping. Figure 11 A schematic diagram of the structure for the fourth action in the working process: the T-shaped rod rising to clamp and relax. Figure 12 This is a schematic diagram of the structure for the fifth action in the working process: the T-shaped rod rotating back to its original position.

[0018] Reference numerals: 1. Body assembly; 11. Axial guide groove; 2. Drive rod assembly; 21. Helical raceway; 22. Guide pin; 23. Cylinder rod; 24. Cylinder piston; 3. Clamping head assembly; 31. First rolling element; 32. T-bar; 321. T-head; 33. Bearing structure; 331. Bearing upper cover; 332. Bearing lower cover; 34. Second rolling element; 35. Baffle; 4. Compression spring; 5. Piston assembly; E1, First air chamber; E2, Second air chamber; A1, First air port; A2, Second air port; E, Oil chamber; B, Oil port; 01. Mold; 02. Press table. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] In the description of this utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are 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.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1 to 12 As shown: A rotary clamping device includes: a body assembly 1, a drive rod assembly 2, a clamping head assembly 3, and a drive unit; The drive rod assembly 2 is movably disposed within the body assembly 1 along the axial direction, and a helical curved surface is provided on the outer circular surface of the head of the drive rod assembly 2; The clamping head assembly 3 is partially sleeved on the outer side of the head of the drive rod assembly 2. A first rolling element 31 is provided on the inner peripheral wall of the clamping head assembly 3, and the first rolling element 31 cooperates with the helical curved surface. The drive unit is used to drive the drive rod assembly 2 and the piston assembly 5 to move axially; After reaching the limit, when the drive rod assembly 2 continues to move axially, it drives the clamping head assembly 3 to rotate around its axis through the cooperation of the helical curved surface and the first rolling element 31.

[0023] The working principle is as follows: (Reference) Figure 1 Initially, the drive rod assembly 2 is at the lower end, and the clamping head assembly 3 is also in a low position. During operation, the drive unit first pushes the drive rod assembly 2 upward axially, passing through the slot on the mold 01 and above the top surface of the mold 01. During this process, after reaching the limit, the drive rod assembly 2 continues to move axially, driving the clamping head assembly 3 to rotate. Through the cooperation of the aforementioned helical surface and the first steel ball, the clamping head assembly 3 rotates 90° according to a preset sequence, so that the direction of its top T-shaped head 321 is perpendicular to the length direction of the slot on the mold 01. Subsequently, the drive unit provides a greater thrust, causing the clamping head assembly 3 to perform a downward clamping action, completing the locking of the mold 01. Correspondingly, the loosening process is carried out in the reverse order, which will not be described in detail here. Throughout the entire operation, rolling friction not only improves the transmission efficiency but also reduces the dependence on lubrication, making the device more stable in harsh industrial environments and significantly reducing the frequency and cost of daily maintenance.

[0024] The helical surface of the drive rod head and the first rolling element 31 on the inner wall of the clamping head assembly 3 form a rolling friction pair, replacing the sliding friction of the lead screw pair in the prior art. This reduces the frictional resistance during the movement, allowing the linear motion of the drive rod assembly 2 to be converted into the rotational motion of the clamping head assembly 3 more quickly and smoothly, resulting in a faster overall response speed and lower energy loss. The rotation angle of the clamping head assembly 3 is determined by the axial travel of the drive rod assembly 2 and the helix angle of the helical surface. Through precise design and machining of the helical surface, precise control of the rotation angle of the clamping head assembly 3 can be achieved (e.g., precise rotation of 90 degrees), without the backlash problem that may exist in traditional lead screw pairs. The repeatability and positioning accuracy of the action are high, and the reliability is good. Due to the use of rolling friction, the wear of this mechanism is minimal, and its service life is long. At the same time, its dependence on lubrication is much lower than that of the lead screw pair with sliding friction, reducing the frequency and cost of daily maintenance and making it more adaptable to harsh industrial environments.

[0025] As a preferred embodiment of the above, refer to Figures 2 to 3 The clamping head assembly 3 includes a T-shaped rod 32 and a bearing structure 33; One end of the T-shaped rod 32 is provided with a T-shaped head 321 for pressing the mold 01, and the other end is provided with a bearing structure 33. A second rolling element 34 is provided between the bearing structure 33 and the T-shaped rod 32, so that the T-shaped rod 32 can rotate freely relative to the main body assembly 1.

[0026] Specifically, the bearing structure 33 includes an upper bearing cover 331 and a lower bearing cover 332, which are fixedly connected. An annular raceway is formed on the T-shaped rod 32, the upper bearing cover 331, and the lower bearing cover 332. The second rolling element 34 and the first rolling element 31 are both steel balls, and the second rolling element 34 is housed in the annular raceway. Through the combination of the upper bearing cover 331, the lower bearing cover 332, and the annular raceway, the integrated design simplifies the number of parts and the assembly process of the final product, reduces the number of parts to be assembled on-site, reduces the assembly difficulty caused by the cumulative error of multiple parts, and improves production efficiency and consistency.

[0027] In this embodiment, refer to Figure 1 , Figure 2 A baffle 35 is provided on the end face of the T-shaped rod 32 facing the drive rod assembly 2; The baffle 35 is used to prevent the drive rod assembly 2 from disengaging from the clamping head assembly 3, while ensuring the effective cooperation between the first rolling element 31 and the helical raceway 21 at the head of the clamping head assembly. Specifically, it provides reliable and precise axial constraint for the first rolling element 31, fundamentally preventing it from disengaging from its installation position during high-speed, repetitive, or impactful linear rotational transitions. This effectively limits the axial displacement of the first rolling element 31, thereby avoiding the risk of the rolling element exceeding its design stroke range, resulting in inaccurate rotation angles or device failure. It ensures the rotational accuracy of the T-bar 32 and the clamping head assembly 3, making the clamping and releasing actions more precise and reliable.

[0028] Among them, the helical surface is at least one helical raceway 21 formed on the outer surface of the head of the drive rod assembly 2; A portion of the first rolling element 31 is embedded in the clamping head assembly 3, and another portion is embedded in the helical raceway 21. In this embodiment, refer to... Figure 4There are three spiral raceways 21, which are evenly distributed around the head of the drive rod assembly 2. These spiral raceways are evenly distributed around the head of the drive rod assembly 2 to ensure that the first rolling element 31 can move evenly on each raceway when the drive rod assembly 2 moves axially, thereby driving the rotation of the clamping head assembly 3. The design of the evenly distributed spiral raceways 21 can maintain high precision in different operating environments, and is especially suitable for occasions that require high-precision clamping and releasing operations. Other numbers of spiral raceways 21 are also possible, all of which are within the protection scope of this application.

[0029] As a preferred embodiment of the above, the helix angle and stroke of the helical raceway 21 are configured such that when the drive rod assembly 2 moves a predetermined stroke, the drive clamping head assembly 3 rotates exactly 90°, ensuring the accuracy of the clamping device and ensuring that the rotation angle of the clamping head assembly 3 remains consistent in each operation. Through the precisely configured helix angle and stroke, insecure clamping or loosening of the mold 01 caused by inconsistent or uncontrollable rotation angles is avoided, thereby improving the stability and reliability of the equipment. By precisely configuring the helix angle and raceway stroke to control the rotation angle, compared to other mechanical transmission methods such as complex gear transmissions, this design makes the structure of the device simpler and more compact, reduces the complexity of mechanical transmission, and avoids the error accumulation and noise problems that may occur with traditional gear systems.

[0030] In this embodiment, an elastic element is also included. The elastic element is disposed between the head of the drive rod assembly 2 and the clamping head assembly 3. During the lifting and lowering process of the clamping head assembly 3, the elastic element ensures that the relative position of the drive rod assembly 2 and the clamping head assembly 3 remains unchanged.

[0031] Among them, the elastic element is a compression spring 4; When the cylinder rod 23 continues to rise after the T-shaped rod 32 has completed its upward stroke, the compression spring 4 is compressed, which allows the drive rod assembly 2 to undergo axial displacement relative to the clamping head assembly 3, thereby triggering the engagement between the helical surface and the first rolling element 31, driving the clamping head assembly 3 to rotate. By introducing the compression spring 4, it can maintain good performance and durability under high frequency and high load environments, making it suitable for various automated production lines and significantly improving production efficiency and safety.

[0032] As a preferred embodiment of the above, continue to refer to Figure 1 The drive unit includes a cylinder drive unit; The drive rod assembly 2 includes a cylinder rod 23 and a cylinder piston 24 disposed at one end of the cylinder rod 23. The cylinder piston divides the inner cavity of the body assembly 1 into a first air chamber E1 and a second air chamber E2. The cylinder drive unit includes a first air port A1 connected to the first air chamber E1 and a second air port A2 connected to the second air chamber E2. By controlling the flow direction and pressure change of the air pressure, the lifting and lowering of the drive rod and the rotation of the clamping head assembly 3 are precisely controlled. Specifically, the air pressure can quickly push the drive rod assembly 2 to complete the predetermined stroke, thereby efficiently triggering the rotation. The overall action cycle time is short, which greatly improves the mold 01 replacement efficiency. The cylinder piston that provides the main power is directly integrated into the drive rod assembly 2, and the inner wall of the body assembly 1 is used as the cylinder barrel. This allows the force of the air pressure acting on the end face of the cylinder piston to act directly on the drive rod assembly 2 itself without intermediate transmission links. The force flow path is the shortest, the energy loss is small, the structure is compact, and the rigidity is good.

[0033] In this embodiment, the drive unit further includes a hydraulic drive unit for providing the final clamping force; The hydraulic drive unit includes an oil chamber E formed within the body assembly 1 and an oil port B communicating with the oil chamber E; It also includes piston assembly 5, which is slidably disposed within oil chamber E; Piston assembly 5 is located above clamping head assembly 3. When oil enters through port B, the hydraulically driven piston assembly 5 moves downward and pushes clamping head assembly 3 to perform clamping action. Specifically, the pneumatic drive unit is responsible for the rapid no-load stroke (drive rod rises, triggering clamping head assembly to rotate), giving full play to its advantages of fast response and high speed, greatly shortening the auxiliary time for mold 01 changeover. Subsequently, the hydraulic drive unit intervenes, providing huge and stable clamping force within a very short stroke, overcoming the inherent defect of insufficient pneumatic clamping force.

[0034] The incompressibility of hydraulic oil allows the pressure in the oil chamber E to remain stable for a long time under clamping conditions, thus providing rigid locking. This ensures that the mold 01 will not loosen under the huge impact and vibration of the stamping operation, making the clamping safe and reliable and avoiding safety accidents and quality defects caused by the attenuation of clamping force.

[0035] Among them, the drive rod assembly 2 is constrained by the guide mechanism to be able to move only axially; The guiding mechanism includes a guide pin 22 disposed on the drive rod assembly 2 and an axial guide groove 11 disposed on the body assembly 1 that cooperates with the guide pin 22. Specifically, the guiding mechanism ensures that the drive rod assembly 2 can only move axially, which is crucial for the precise rotation of the clamping head assembly 3. Since the movement of the drive rod assembly 2 is not disturbed by other directions, it can ensure that the rotation angle of the clamping head assembly 3 is always accurate, avoiding instability or accuracy error during the clamping process.

[0036] The detailed motion process of this technical solution is as follows: 1. Initial working state, such as Figure 5 , 6As shown; 1) Oil circuit at port B is disconnected, air circuit at port A2 is disconnected, and air circuit at port A1 is open; 2) Pneumatic pressure presses the drive rod assembly 2 until the cylinder piston 24 contacts the base of the main body assembly 1. At this time, the clamping head assembly 3 descends to its lowest point under the traction of the drive rod assembly 2, and the upper surface of the T-shaped rod 32 is lower than the upper surface of the press table 02 to ensure that the mold 01 can normally enter and exit the press table 02; the piston assembly 5 rises to its highest point; the head of the T-shaped rod 32 is oriented as follows... Figure 6 As shown, the T-shaped rod 32 can pass upward through the U-shaped notch on the press table 02 and the mold 01; 2. The first action in the working process is that the T-shaped rod 32 rises, as... Figure 7 As shown; 1) Oil circuit at port B is open, air circuit at port A2 is open, and air circuit at port A1 is closed; 2) The air pressure acts on the piston of the drive rod assembly 2, pushing it to rise, and pushes the clamping head assembly 3 to rise through the compression spring 4 between the cylinder assembly and the clamping head assembly 3 until the bearing cover 331 of the clamping head assembly 3 contacts the piston assembly 5. At this time, the rising stroke of the T-shaped rod 32 ends, and the lower surface of the T-shaped head 321 is higher than the upper surface of the mold 01.

[0037] 3. The second action in the working process is that the T-shaped rod 32 rotates 90°, as follows. Figure 8 , 9 As shown; 1) Oil circuit at port B is open, air circuit at port A2 is open, and air circuit at port A1 is closed; 2) After the T-shaped rod 32 completes its upward stroke, the cylinder rod 23 continues to rise until the piston of the drive rod assembly 2 contacts the shoulder of the T-shaped rod 32 and stops. During this process, because the bearing cover 331 of the clamping head assembly 3 and the piston assembly 5 have already contacted, the clamping head assembly 3 cannot rise further; while the drive rod assembly 2, due to the restriction of its own guide pin 22 and the guide groove of the body assembly 1, can only move upward (cannot rotate). During the upward movement of the cylinder rod 23, the first steel ball embedded in the T-shaped rod 32 moves along the spiral raceway 21 at the head of the cylinder rod 23, thereby driving the T-shaped rod 32 to rotate around its own axis until the cylinder rod 23 stops rising. After the rotation is completed, the head of the T-shaped rod 32 is oriented as follows: Figure 9 As shown.

[0038] 4. The third action in the working process is clamping, such as... Figure 10 As shown; 1) Oil circuit at port B is open, air circuit at port A2 is open, and air circuit at port A1 is closed; 2) The hydraulic pressure acts on the piston, causing the piston to move downward. When the rotation ends, the piston, clamping head assembly 3, and drive rod assembly 2 come into contact with each other. The downward force of the hydraulic pressure on the piston is much greater than the upward force of the air pressure on the cylinder piston. Therefore, the piston assembly 5 drives the clamping head assembly 3 and drive rod assembly 2 to move downward together until the lower surface of the T-head 321 presses against the upper surface of the mold 01.

[0039] 5. The fourth movement during the work process is to clamp and relax, such as... Figure 11 As shown; 1) Oil circuit at port B is open, air circuit at port A2 is open, and air circuit at port A1 is closed; 2) The air pressure acts on the cylinder piston 24, causing the piston to move upward, which in turn drives the piston assembly 5 and the clamping head assembly 3 to move upward together until the piston end face contacts the body assembly 1.

[0040] 6. The fifth action in the working process is to rotate back to the original position, such as... Figure 12 As shown; 1) Oil circuit at port B is open, air circuit at port A2 is open, and air circuit at port A1 is open; 2) The air pressure acts on the cylinder piston 24, causing the piston to move downward until the piston contacts the baffle 35 of the clamping head assembly 3. During this process, due to the action of the compression spring 4, the clamping head assembly 3 and the piston assembly 5 do not move. The three first steel balls in the clamping head assembly 3 move along the spiral raceway 21 at the head of the cylinder rod 23, thereby driving the T-shaped rod 32 to rotate back to its original position around its own axis.

[0041] 7. The sixth action in the working process is to descend and return to the starting position. (Continue to refer to...) Figure 5 ; 1) Oil circuit at port B is open, air circuit at port A2 is open, and air circuit at port A1 is open; 2) After the rotation returns to its original position, air continues to flow through air passage A1. The drive rod assembly 2, along with the clamping head assembly 3, continues to descend until the piston of the drive rod assembly 2 contacts the base of the body assembly 1. The descent process ends, and the assembly returns to its initial state. After returning to its original position, the head of the T-shaped rod 32 is oriented as follows: Figure 5 As shown.

[0042] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rotary chucking device, characterized by include: Body assembly, drive rod assembly, clamping head assembly, and drive unit; The drive rod assembly is movably disposed within the body assembly along the axial direction, and a helical curved surface is provided on the outer circular surface of the head of the drive rod assembly; The clamping head assembly is partially sleeved on the outer side of the head of the drive rod assembly, and a first rolling element is provided on the inner peripheral wall of the clamping head assembly, the first rolling element cooperating with the helical surface; The drive unit is used to drive the drive rod assembly to move axially. Once the limit is reached, when the drive rod assembly continues to move axially, the clamping head assembly is driven to rotate around its axis through the cooperation of the helical surface and the first rolling element.

2. The rotary clamp device according to claim 1, characterized in that The clamping head assembly includes a T-shaped rod and a bearing structure; One end of the T-shaped rod is provided with a T-shaped head for pressing the mold, and the other end is provided with the bearing structure. A second rolling element is provided between the bearing structure and the T-shaped rod, so that the T-shaped rod can rotate freely relative to the main body assembly.

3. The rotary clamping device according to claim 2, characterized in that, A baffle is provided on the end face of the T-shaped rod facing the drive rod assembly; The baffle is used to prevent the drive rod assembly from disengaging from the clamping head assembly, while ensuring effective engagement between the first rolling element and the helical raceway at the head of the clamping head assembly.

4. The rotary clamp device according to claim 1, characterized in that The helical surface is formed by machining at least one helical raceway on the outer surface of the head of the drive rod assembly. One part of the first rolling element is embedded in the clamping head assembly, and the other part is embedded in the helical raceway.

5. The rotary clamp device according to claim 4, characterized in that The helix angle and stroke of the spiral raceway are configured such that when the drive rod assembly moves a predetermined stroke, it drives the clamping head assembly to rotate exactly 90°.

6. The rotary clamp device of claim 1, wherein, It also includes an elastic element disposed between the head of the drive rod assembly and the clamping head assembly, the elastic element being used to ensure that the relative position of the drive rod assembly and the clamping head assembly remains unchanged.

7. The rotary clamp device according to claim 6, characterized in that The elastic element is a compression spring; When the axial movement of the drive rod assembly reaches the limit, the compression spring is compressed, allowing the drive rod assembly to undergo axial displacement relative to the clamping head assembly, thereby triggering the engagement of the helical surface with the first rolling element and driving the clamping head assembly to rotate.

8. The rotary clamp device according to claim 2, wherein The drive unit includes a cylinder drive unit; The drive rod assembly includes a cylinder rod and a cylinder piston disposed at one end of the cylinder rod, the cylinder piston dividing the inner cavity of the body assembly into a first air chamber and a second air chamber. The cylinder drive unit includes a first air port communicating with the first air chamber and a second air port communicating with the second air chamber. The lifting and lowering of the drive rod and the rotation of the clamping head assembly are precisely controlled by controlling the flow direction and pressure change of the air pressure.

9. The rotary clamp device of claim 1, wherein, The drive unit also includes a hydraulic drive unit for providing the final clamping force; The hydraulic drive unit includes an oil cavity formed within the body assembly and an oil port communicating with the oil cavity; It also includes a piston assembly slidably disposed within the oil chamber; The piston assembly is located above the clamping head assembly. When oil enters through the oil port, the piston assembly is hydraulically driven to move downward and push the clamping head assembly to perform a clamping action.

10. The rotary clamp device of claim 1, wherein, The driving rod assembly is constrained by a guide mechanism to be able to move only axially; The guide mechanism comprises a guide pin arranged on the driving rod assembly and an axial guide slot arranged on the body assembly and matched with the guide pin.

Images