Guide pillar type wedge mechanism without return spring

Abstract

The invention discloses a guide pillar type wedge mechanism without a return spring, which comprises a base pillar internally provided with an axial through channel; the sliding column is movably arranged in the base column and can move along the channel; the rotation stopping block is arranged in the channel of the base column and used for limiting the moving direction of the sliding column and preventing the sliding column from rotating during moving; the pull-back block is respectively connected with and used as a transmission mechanism of the sliding column and the driving block; the driving block is used for being connected with a driving device and driving the sliding column to move in the channel of the base column through the pull-back block. By adopting the design without a return spring, the pull-back block and the driving block are utilized to realize transmission, so that the problems of complicated structure and maintenance caused by the fact that a traditional tapered wedge mechanism depends on the return spring are solved, and the tapered wedge mechanism has the advantages of simplifying the structure, reducing the maintenance difficulty, improving the operation reliability and enhancing the adaptability to different molds.

Description

A guide post type wedge mechanism without return spring Technical Field

[0001] This application relates to the field of mechanical mold technology, and more specifically, to a guide post type wedge mechanism without a return spring. Background Technology

[0002] In the field of mechanical molds, especially in stamping dies widely used in automobile manufacturing, the wedge mechanism, as a core transmission component, directly affects the mold's operating efficiency, machining accuracy, and ease of daily maintenance. Traditional wedge mechanisms generally use return springs to achieve automatic reset after operation, but this design introduces significant structural defects.

[0003] The introduction of the return spring makes the overall mechanism redundant, the assembly process cumbersome, and increases the difficulty of manufacturing and debugging. In actual maintenance operations, when the wedge mechanism needs to be repaired or replaced, operators must first disassemble the workpiece side plate blocks and other auxiliary fixing components one by one before they can access the internal slider. This process is not only time-consuming and laborious, but also prone to wear or misalignment of other precision components due to repeated disassembly and assembly, seriously affecting the continuous operation of the production line.

[0004] Furthermore, springs, as consumable parts, are prone to fatigue failure under long-term, high-frequency operation, leading to inaccurate reset or even mechanism jamming, which in turn causes mold failure. The presence of springs also increases the total number of parts in the system, shortening the maintenance cycle and significantly increasing the maintenance frequency, resulting in longer downtime and higher maintenance costs. More importantly, traditional designs have serious shortcomings in adaptability. When faced with different mold thicknesses, stroke lengths, or working angle requirements, it is often necessary to customize spring parameters or adjust the overall structure, lacking flexibility and versatility, and failing to meet the requirements of rapid changeover and high-precision control in modern mold production.

[0005] These problems collectively hinder efficiency improvement and cost optimization in the mold industry, necessitating an innovative solution to eliminate reliance on return springs. Summary of the Invention

[0006] The purpose of this application is to provide a guide post type wedge mechanism without return spring, which has the advantages of simplifying the mechanism structure, reducing maintenance difficulty, improving operational reliability and enhancing adaptability to different molds.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] A guide post type wedge mechanism without return spring, including

[0009] The base column has an axially penetrating channel inside;

[0010] The sliding column is movably installed inside the base column and can move along the channel;

[0011] An anti-rotation block is installed in the channel of the base column. It is used to limit the direction of movement of the sliding column and prevent the sliding column from rotating when moving.

[0012] The pull-back block connects to and serves as a transmission mechanism for the slide column and the drive block, respectively.

[0013] The drive block is used to connect the drive unit and drive the slide column to move within the channel of the base column by pulling back the block.

[0014] Furthermore, the outer surface of the sliding column is provided with a sliding groove, which is arranged along the axial direction of the sliding column, and a limiting step is provided at the end of the sliding groove;

[0015] After the sliding column is installed into the channel, the sliding groove contacts the outer end face of the anti-rotation block. During the movement of the sliding column along the channel, the rotational torque generated by the sliding column is transmitted to the anti-rotation block through the sliding groove, and the anti-rotation block cancels out the rotational torque.

[0016] Furthermore, the top of the sliding column extends out of the base column and is connected to the pull-back block through the first transmission structure;

[0017] The first transmission structure includes a set of mounting grooves symmetrically arranged on the outer circumferential surface of the top of the slide column, and a set of first protrusions symmetrically arranged at the bottom of the pull-back block;

[0018] The first protrusion of the pull-back block slides into the mounting groove of the slide column from the side, and can pull the slide column upward along the channel under the action of the drive block.

[0019] Furthermore, the pull-back block is connected to the drive block via a first transmission structure;

[0020] The first transmission structure includes a set of limiting grooves symmetrically arranged at the bottom of the drive block, and a set of second protrusions symmetrically arranged at the top of the pull-back block;

[0021] The second protrusion of the pull-back block slides into the limiting groove of the drive block from the side and is rigidly connected to the drive block through a fixed connection structure.

[0022] Furthermore, the fixed connection structure includes a plurality of inner connection holes formed in the limiting groove and an outer connection hole formed on the second protrusion.

[0023] The inner connecting holes are distributed along the length of the limiting groove. After the second protrusion slides into the limiting groove of the drive block from the side, the outer connecting hole aligns with a corresponding inner connecting hole and is fixed by bolt connection, thereby realizing the rigid connection between the pull-back block and the drive block.

[0024] Furthermore, a self-lubricating copper sleeve is provided in the channel of the base column, and a self-lubricating wear-resistant plate is provided at the top of the sliding column.

[0025] In summary, the present invention has the following beneficial effects:

[0026] By adopting a springless design, transmission is achieved using a pull-back block and a drive block, thus solving the complex structure and maintenance problems caused by the reliance on return springs in traditional wedge mechanisms. This approach offers advantages such as simplified structure, reduced maintenance difficulty, improved operational reliability, and enhanced adaptability to different molds. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the guide post type wedge mechanism without return spring described in this invention.

[0028] Figure 2 is a cross-sectional view of the guide post type wedge mechanism without return spring described in this invention.

[0029] Figure 3 is a schematic diagram of the structure of the base column described in this invention.

[0030] Figure 4 is a schematic diagram of the position of the anti-rotation block described in this invention within the base column.

[0031] Figure 5 is a schematic diagram of the sliding column of the present invention.

[0032] Figure 6 is a schematic diagram of the connection between the pull-back block and the drive block according to the present invention.

[0033] Figure 7 is a schematic diagram of the connection between the pull-back block and the drive block according to the present invention. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to the figures and specific embodiments.

[0035] Referring to Figures 1 to 7, this application proposes a guide post type wedge mechanism without a return spring. The mechanism includes a base post 1 with an axially penetrating channel 11 inside; a sliding post 2, movably disposed within the base post 1 and movable along the channel 11; an anti-rotation block 3, disposed within the channel 11 of the base post 1, used to limit the movement direction of the sliding post 2 and prevent the sliding post 2 from rotating during movement; a pull-back block 4, connected to and used as a transmission mechanism for the sliding post 2 and a drive block 5; and a drive block 5, used to connect to a drive device and drive the sliding post 2 to move within the channel 11 of the base post 1 via the pull-back block 4.

[0036] This application aims to solve the problems of complex structure, inconvenient disassembly and assembly, and high maintenance cost caused by the reliance on return springs in traditional wedge mechanisms.

[0037] For ease of understanding, the following explains some key terms in this embodiment:

[0038] The base column 1 serves as the main support structure of the mechanism, and its interior has an axially penetrating channel 11, which is used to provide stable guidance and support for the sliding column 2.

[0039] Channel 11 is located inside the base column 1, providing a precise guide path for the axial movement of the sliding column 2.

[0040] The sliding column 2, as the core moving component of the mechanism, is movably set in the channel 11 and can move axially along the channel 11 to realize the working stroke of the wedge mechanism.

[0041] The anti-rotation block 3 is installed in the channel 11. Its function is to limit the movement direction of the slide column 2 and prevent the slide column 2 from rotating undesirably during the movement, so as to ensure the linear motion accuracy of the slide column 2.

[0042] The pull-back block 4 serves as a transmission connection component, connecting the slide column 2 and the drive block 5 respectively. It is used to transmit the driving force to the slide column 2 under the action of the drive block 5, thereby realizing the driving and resetting of the slide column 2.

[0043] The drive block 5 is used to connect to an external drive device and to apply a driving force to the slide column 2 by pulling back the block 4, thereby controlling the movement of the slide column 2 in the channel 11.

[0044] Specifically, regarding the arrangement of the base column 1 and its channel 11, the base column 1 can be a structure with sufficient strength and rigidity, whose interior is machined, for example, by drilling, boring, or milling, to form an axially penetrating channel 11. The inner wall of the channel 11 can be precision machined, for example by grinding or honing, to provide a smooth guiding surface, thereby reducing friction during the movement of the slide column 2. For example, the base column 1 can be made of high-strength alloy steel or cast iron, and the inner diameter of the channel 11 matches the outer diameter of the slide column 2 to ensure stable movement of the slide column 2 within it.

[0045] Regarding the movable arrangement of the slide column 2, it is typically designed as a cylindrical rod with a suitable clearance fit between its outer diameter and the inner diameter of the channel 11, allowing it to move freely axially within the channel 11. The surface of the slide column 2 can be hardened, plated, or polished to improve its wear resistance and surface hardness, thereby extending its service life. For example, the slide column 2 can be made of tool steel that has undergone quenching and tempering, achieving a surface hardness of HRC58-62 to withstand high-frequency reciprocating motion.

[0046] Regarding the setting and function of the anti-rotation block 3, the anti-rotation block 3 can be fixed on the inner wall of the channel 11 of the base column 1. The anti-rotation block 3 engages with the corresponding opening groove on the outer surface of the sliding column 2. When the sliding column 2 moves within the channel 11, the engaging structure of the anti-rotation block 3 and the sliding column 2 interacts, thereby limiting the direction of movement of the sliding column 2 and effectively preventing undesirable rotation of the sliding column 2 during axial movement. For example, the anti-rotation block 3 can be a rectangular block fixed on the inner wall of the base column 1, engaging with the opening groove milled axially on the sliding column 2 to achieve the anti-rotation function.

[0047] Regarding the pull-back block 4 as a connection in the transmission mechanism, it is designed as an intermediate transmission component connecting the slide column 2 and the drive block 5. It may have multiple connection points or surfaces, connected to the top of the slide column 2 and the bottom of the drive block 5 via mechanical connections, such as pin connections, bolt connections, or snap-fit ​​connections. The material and structure of the pull-back block 4 should ensure that it can reliably transmit the tensile or thrust force applied by the drive block 5 to the slide column 2. For example, the pull-back block 4 may be a connector stamped from a high-strength steel plate, with structures at both ends for connecting to the slide column 2 and the drive block 5.

[0048] Regarding the connection and driving function of the drive block 5, the drive block 5 is configured to connect with an external drive device, such as a hydraulic cylinder, a pneumatic cylinder, a linkage mechanism driven by a servo motor, or a cam mechanism. The drive block 5, through its own reciprocating motion, transmits driving force to the slide column 2 via the pull-back block 4, thereby achieving precise control over the movement of the slide column 2 within the channel 11 of the base column 1. For example, the drive block 5 can be a block with a standard connection interface, connected to the piston rod of the hydraulic cylinder by bolts. When the hydraulic cylinder operates, the drive block 5 is pushed or pulled, thereby driving the pull-back block 4 and the slide column 2 to move.

[0049] This application, through the adoption of a guide post type wedge mechanism without a return spring, effectively solves the problems of complex structure, inconvenient assembly and disassembly, poor adaptability, and high maintenance costs caused by the reliance on return springs in traditional mechanisms, particularly in automotive molds. This mechanism ensures stability and precision of movement through the guiding cooperation of the base post 1 and the sliding post 2, and the anti-rotation function of the anti-rotation block 3. The active transmission between the pull-back block 4 and the drive block 5 replaces the passive reset of the spring, thereby simplifying the mechanism design, improving the ease of assembly and disassembly, enhancing adaptability to different mold thicknesses, strokes, and working angles, and significantly reducing maintenance requirements and costs.

[0050] In some of the solutions described above in this application, a sliding column is proposed to be movable within the base column for moving along the channel, and is prevented from rotating by an anti-rotation block. However, in this process, the rotational torque generated by the sliding column during movement may not be effectively offset, causing the sliding column to rotate, affecting the motion accuracy and stability of the mechanism, and thus reducing the overall working reliability.

[0051] In this regard, this application further proposes that the outer surface of the sliding column 2 is provided with a sliding groove 21, the sliding groove 21 is arranged along the axial direction of the sliding column 2, and a limiting step 22 is provided at the end of the sliding groove 21; after the sliding column 2 is installed into the channel 11, the sliding groove 21 contacts the outer end face of the anti-rotation block 3, and during the movement of the sliding column 2 along the channel 11, the rotational torque generated by the sliding column 2 is transmitted to the anti-rotation block 3 through the sliding groove 21, and the anti-rotation block 3 cancels out the rotational torque.

[0052] Specifically, the slide groove 21 is an open groove structure set on the outer surface of the slide column 2. Its main function is to provide guidance for the linear movement of the slide column 2 and to serve as an interface for interacting with the anti-rotation block 3 to transmit and counteract the rotational torque.

[0053] The groove 21 is arranged along the axial direction of the slide column 2, meaning that the extension direction of the groove 21 is parallel or substantially parallel to the central axis of the slide column 2. This arrangement ensures that when the slide column 2 makes linear reciprocating motion within the channel 11 of the base column 1, the groove 21 can maintain effective contact with the anti-rotation block 3, thereby providing stable guidance and anti-rotation function throughout the entire stroke. For example, the groove 21 can extend from the top to the bottom of the slide column 2, covering the entire effective stroke of the slide column 2, or only covering the portion required for its working stroke.

[0054] After the sliding column 2 is installed into the channel 11, the sliding groove 21 contacts the outer end face of the anti-rotation block 3, establishing a direct mechanical connection between the sliding column 2 and the anti-rotation block 3. This contact is crucial for transmitting rotational torque, ensuring that when the sliding column 2 is subjected to any torque that could cause it to rotate, it can immediately transmit that torque to the anti-rotation block 3 through the sliding groove 21. The outer end face of the anti-rotation block 3 can be a plane, and the sliding groove 21 directly abuts against that plane.

[0055] As the slide column 2 moves along the channel 11, the rotational torque generated by the slide column 2 is transmitted to the anti-rotation block 3 through the groove 21. This means that when the slide column 2 is subjected to a rotational tendency caused by external or internal factors (such as uneven friction, lateral load, etc.), the side wall of the groove 21 will interact with the contact surface of the anti-rotation block 3, converting the rotational torque into a lateral thrust on the anti-rotation block 3. For example, if the slide column 2 attempts to rotate clockwise, one side wall of the groove 21 will press against the corresponding surface of the anti-rotation block 3, thereby transmitting the rotational torque.

[0056] Ultimately, the rotational torque is counteracted by the anti-rotation block 3. The anti-rotation block 3 is typically securely fixed within the channel 11 of the base column 1, or it possesses sufficient structural strength and a fixed connection to the base column 1 to withstand and resist the rotational torque transmitted from the sliding column 2. In this way, the anti-rotation block 3 effectively prevents the rotation of the sliding column 2, ensuring pure linear motion of the sliding column 2 within the channel 11.

[0057] Through the above technical solution, the groove 21 on the outer surface of the sliding column 2 forms a precise fit with the anti-rotation block 3, so that any rotational torque generated by the sliding column 2 when it moves along the channel 11 can be efficiently and directly transmitted to the anti-rotation block 3 through the side wall of the groove 21. As a fixed component, the anti-rotation block 3 can effectively absorb and counteract these rotational torques, thereby completely eliminating the rotational tendency of the sliding column 2. This design significantly improves the stability and accuracy of the sliding column 2's movement, avoids mechanism jamming, uneven wear, or positioning errors caused by rotation, and thus ensures the reliable operation and extended service life of the entire guide column type wedge mechanism without return spring. At the same time, the setting of the limiting step 22 further ensures the safe stroke of the sliding column 2 in the axial direction, prevents overshoot or disengagement, and enhances the overall safety of the mechanism.

[0058] In some of the solutions described above in this application, a pull-back block is proposed to connect the sliding column and the drive block as a transmission mechanism. However, in the implementation process, the connection method may lack convenience and reliability, resulting in inconvenience in disassembly and assembly or low transmission efficiency.

[0059] In response, this application further proposes that the top of the sliding column 2 extends beyond the base column 1 and is connected to the pull-back block 4 via a first transmission structure. The first transmission structure includes a set of mounting grooves 23 symmetrically arranged on the outer circumferential surface of the top of the sliding column 2, and a set of first protrusions 41 symmetrically arranged at the bottom of the pull-back block 4. The first protrusions 41 of the pull-back block 4 slide into the mounting grooves 23 of the sliding column 2 from the side, and can pull the sliding column 2 upward along the channel 11 under the action of the drive block 5.

[0060] The top of the sliding column 2 protrudes from the base column 1, meaning that when the sliding column 2 moves within the channel 11 of the base column 1, its top is always higher than the top surface of the base column 1, or at a specific working position. This design facilitates external operation and connection, such as making it easy to connect or disconnect the pull-back block 4 from the sliding column 2.

[0061] The first transmission structure is a key component for realizing the mechanical connection and force transmission between the sliding column 2 and the pull-back block 4. This structure is designed to ensure that, under the action of the drive block 5, the pull-back block 4 can stably and reliably pull the sliding column 2 upward along the channel 11. In addition to the matching method of the mounting groove 23 and the first protrusion 41 used in this application, the first transmission structure can also take other forms, for example, connecting the top of the pull-back block 4 to the top of the sliding column 2 by a pin, or fixing the two together by bolts.

[0062] The mounting groove 23 is a recess on the outer circumference of the top of the sliding column 2. Its main function is to accommodate and guide the first protrusion 41 of the pull-back block 4, thereby realizing the connection and force transmission between the two. The mounting groove 23 can be designed in various shapes, such as rectangular grooves, T-shaped grooves, or dovetail grooves. Its specific shape should match the first protrusion 41 to ensure the stability of the connection and the reliability of the transmission. Symmetrically arranged mounting grooves 23 help to evenly distribute the load during the pulling process and avoid wear or failure caused by uneven force.

[0063] The first protrusion 41 is a raised structure located at the bottom of the pull-back block 4. Its main function is to insert into the mounting groove 23 of the slide column 2 and act as a force transmission component to transfer the pulling force of the pull-back block 4 to the slide column 2. The shape of the first protrusion 41 should match the mounting groove 23, such as a rectangular protrusion, a T-shaped protrusion, or a dovetail protrusion. The symmetrical arrangement of the first protrusion 41 and the symmetrical arrangement of the mounting groove 23 can ensure the balance of force during the pulling process, improve the transmission efficiency and the stability of the mechanism.

[0064] The first protrusion 41 of the pull-back block 4 slides into the mounting groove 23 of the slide column 2 from the side. This means that the first protrusion 41 is not inserted into the mounting groove 23 along the axial direction of the slide column 2, but enters the groove by moving laterally. This "side-sliding" connection method greatly simplifies the installation and disassembly process, eliminating the need for complex alignment or additional tools and improving the ease of operation. Once the connection is completed, under the action of the drive block 5, the pull-back block 4 can reliably pull the slide column 2 upward along the channel 11 to achieve the expected transmission function.

[0065] Through the above technical solution, the design of the top of the sliding column 2 extending out of the base column 1 provides convenient operating space for external connections. The first transmission structure adopts symmetrically arranged mounting grooves 23 and first protrusions 41, ensuring the stability of the connection and the uniform force during transmission, effectively avoiding wear or failure of the mechanism caused by uneven loading, thereby improving the reliability of the transmission. More importantly, the connection method of the first protrusion 41 sliding into the mounting groove 23 from the side significantly simplifies the installation and disassembly steps of the mechanism, eliminating the need to spend a lot of time on alignment or using special tools, greatly improving maintenance efficiency and ease of operation. Driven by the drive block 5, this connection structure can stably and accurately pull the sliding column 2 upward along the channel 11, ensuring smooth and reliable transmission of the entire wedge mechanism. Overall, this optimized connection method not only solves the problems of inconvenient disassembly and assembly and low transmission efficiency that may exist in traditional connection methods, but also enhances the adaptability and service life of the mechanism.

[0066] In some of the embodiments described above in this application, a pull-back block is proposed as a transmission mechanism to connect the slide block and the drive block. However, in its implementation, the connection may not be rigid enough or easy to disassemble and assemble, resulting in unstable transmission, inconvenient maintenance, and affecting the reliability and adaptability of the mechanism.

[0067] In this regard, this application further proposes that the pull-back block 4 is connected to the drive block 5 via a first transmission structure. This first transmission structure aims to ensure efficient and stable transmission of motion and force between the pull-back block 4 and the drive block 5, thereby achieving precise driving of the slide column 2. Specifically, the first transmission structure includes a set of limiting grooves 51 symmetrically arranged at the bottom of the drive block 5, and a set of second protrusions 42 symmetrically arranged at the top of the pull-back block 4.

[0068] The limiting groove 51 is a recessed structure formed at the bottom of the drive block 5. Its function is to receive and guide the second protrusion 42, ensuring precise alignment of the two during connection. The limiting groove 51 can take various forms. For example, it can be a rectangular groove, formed directly at the bottom of the drive block 5 through machining; it can also be a dovetail groove to provide stronger interlocking capability and pull-out resistance; or it can be a T-shaped groove to cooperate with the T-shaped protrusion. The symmetrically arranged limiting grooves 51 help to balance the force during connection and prevent connection instability or component wear caused by uneven load.

[0069] The second protrusion 42 is a protrusion structure set on the top of the pull-back block 4. Its shape and size match the limiting groove 51 and are used to insert into the limiting groove 51 to form a mechanical connection.

[0070] During the connection process, the second protrusion 42 of the pull-back block 4 slides into the limiting groove 51 of the drive block 5 from the side. This side-sliding connection method greatly simplifies the installation and disassembly of the components, eliminating the need for complex alignment from above or below; the initial connection can be completed simply by pushing the pull-back block 4 in laterally. This design significantly improves the assembly efficiency and maintenance convenience of the mechanism.

[0071] To ensure the rigidity and stability of the transmission process, the pull-back block 4 is rigidly connected to the drive block 5 via a fixed connection structure. The function of this fixed connection structure is to eliminate the relative movement between the second protrusion 42 and the limiting groove 51, making the pull-back block 4 and the drive block 5 a single unit, thereby ensuring that the driving force can be transmitted from the drive block 5 to the pull-back block 4 without loss or gap. Besides the bolt connection method that may be used in subsequent embodiments, this fixed connection structure can also be implemented in other ways. For example, a pin connection can be used, locking the two together by inserting a pin; or a wedge fastening method can be used, tightly pressing the protrusion and groove together with a wedge-shaped element; or even a snap-fit ​​or quick-locking mechanism can be used to achieve a faster rigid connection.

[0072] Through the above technical solution, this application effectively solves the problems of insufficient rigidity and inconvenient assembly and disassembly between the pull-back block and the drive block. Specifically, the symmetrically arranged limiting groove 51 and second protrusion 42 in the first transmission structure ensure the balance and stability of the connection, effectively avoiding off-center loading and shaking during transmission, thereby improving the reliability of the transmission. At the same time, the connection method of the second protrusion 42 sliding into the limiting groove 51 from the side makes the assembly and disassembly of the pull-back block 4 and the drive block 5 extremely convenient, greatly shortening maintenance time and reducing operational difficulty. In addition, the rigid connection achieved through the fixed connection structure eliminates the connection gap, ensuring that the drive block 5 drives the sliding column 2 accurately and without lag, making the entire guide post type wedge mechanism without return spring more stable and efficient during operation. This design not only improves the overall reliability and adaptability of the mechanism, but also provides convenience for the rapid changeover and maintenance of the mold, thereby significantly optimizing the working efficiency and service life of the mold.

[0073] In some of the solutions described above in this application, a fixed structure is proposed to connect the pull-back block and the drive block. However, during implementation, the connection may lack rigidity, leading to instability or decreased transmission accuracy. To address this, this application further proposes a fixed connection structure, which includes several internal connecting holes 52 formed in the limiting groove 51 and external connecting holes 43 formed on the second protrusion 42. This fixed connection structure aims to ensure no relative displacement between two or more components under load, thereby guaranteeing effective force transmission and mechanism stability. Besides bolt connections, common fixed connection methods include riveting, welding, or using pin connections. The internal connecting holes 52 are holes located inside the limiting groove 51, their main function being to cooperate with external connecting parts to fix the components. These holes can be through holes or threaded blind holes for direct screwing in bolts. The arrangement of several internal connecting holes 52 provides multiple selectable connection positions, increasing the flexibility and adjustability of the connection. The outer connecting hole 43 is a hole provided on the second protrusion 42. Its function is to align with the inner connecting hole 52 and allow the connector to pass through or be inserted, thereby connecting the second protrusion 42 to the component where the limiting groove 51 is located. These holes are typically designed as through holes so that bolts can pass through smoothly.

[0074] Specifically, the inner connecting holes 52 are distributed along the length of the limiting groove 51, meaning that connecting holes are provided at different positions in the limiting groove 51. This distribution allows the most suitable inner connecting hole 52 to be selected for fixing after the second protrusion 42 slides into the limiting groove 51, based on the actual alignment, thus accommodating certain assembly errors or adjustment requirements. After the second protrusion 42 slides into the limiting groove 51 of the drive block 5 from the side, the outer connecting hole 43 aligns with a corresponding inner connecting hole 52 and is fixed by bolt connection, achieving a rigid connection between the pull-back block 4 and the drive block 5. This process describes the connection method between the pull-back block 4 and the drive block 5. The second protrusion 42 enters the limiting groove 51 in a sliding manner, ensuring initial positioning and fit. Subsequently, through precise alignment, the outer connecting hole 43 coincides with a certain inner connecting hole 52 in the limiting groove 51. Finally, by inserting and tightening bolts, the two components are firmly connected together. Bolt connection is a reliable and detachable rigid connection method that can withstand large shear and tensile forces. A rigid connection refers to a connection method in which relative movement between the connecting parts is not allowed. The rigid connection between the pull-back block 4 and the drive block 5 is achieved through bolt connection. This means that when the mechanism is working, the pull-back block 4 and the drive block 5 will move as a whole, without loosening, shaking or relative displacement, thus ensuring the accuracy and stability of the transmission process.

[0075] Through the above technical solution, the connection between the pull-back block 4 and the drive block 5 is achieved by bolt fixing after sliding fit, ensuring a rigid connection between the two. This rigid connection effectively eliminates gaps and potential relative movement at the connection point, thereby avoiding instability or decreased transmission accuracy caused by a loose connection during operation. In particular, the distribution of the inner connecting holes 52 along the length of the limiting groove 51 provides flexible selection of fixing points, enabling precise alignment and tightening during assembly, further enhancing the reliability and stability of the connection. This is especially important for the guide post type wedge mechanism without a return spring, because its reset mechanism does not rely on a spring, requiring higher rigidity and precision of the transmission chain, ensuring the precise and reliable movement of the sliding column 2 within the channel 11 of the base column 1.

[0076] In some of the solutions described above in this application, a rigid connection structure between the pull-back block 4 and the drive block 5 is proposed to achieve stable movement of the slide column 2 within the channel 11 of the base column 1. However, in this process, the sliding friction between the slide column 2 and the channel 11 of the base column 1, as well as the contact friction between the top of the slide column 2 and the transmission component, may lead to increased wear of the components, increasing maintenance frequency and cost.

[0077] In this regard, this application further proposes that a self-lubricating copper sleeve 6 is provided in the channel 11 of the base column 1, and a self-lubricating wear-resistant plate 7 is provided at the top of the sliding column 2.

[0078] The self-lubricating copper sleeve 6 is a bearing bushing with self-lubricating capabilities, designed to reduce friction and wear between moving parts without the need for external oil supply. Specifically, the self-lubricating copper sleeve 6 can be implemented in various forms. For example, it can be a porous structure sintered from copper powder using powder metallurgy technology. These pores are pre-impregnated with lubricating oil, which seeps out from the pores due to heat or pressure generated by friction during operation, forming a lubricating film on the friction surface. Alternatively, the self-lubricating copper sleeve 6 can also have solid lubricant particles, such as graphite or molybdenum disulfide, uniformly distributed or embedded in a copper alloy matrix. During friction, these solid lubricants gradually transfer to the friction surface, forming a solid lubricating film with a low coefficient of friction. Furthermore, a copper alloy backing can be used, with a mixture of polymer (such as polytetrafluoroethylene PTFE) and solid lubricant sintered or bonded to its inner surface to provide excellent self-lubricating properties. The self-lubricating copper sleeve 6 is disposed within the channel 11 of the base column 1, and its main function is to provide a low-friction, high-wear-resistant sliding interface for the axial movement of the sliding column 2 within the channel 11.

[0079] The self-lubricating wear-resistant plate 7 is a plate-shaped material with a low coefficient of friction and high wear resistance. It contains its own lubricating components, eliminating the need for external oil supply, and is designed to protect contact surfaces from wear. Specifically, the self-lubricating wear-resistant plate 7 can be made of polymer-based materials, such as engineering plastics like ultra-high molecular weight polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), or polyamide (PA). These materials possess excellent self-lubricating and wear-resistant properties, effectively reducing the coefficient of friction. Another approach is to use composite materials, such as a resin-based plate filled with solid lubricants and reinforcing materials like graphite, molybdenum disulfide, or carbon fiber, providing continuous lubrication through the release of the solid lubricant. Alternatively, plates made by sintering or pressing graphite or bronze powder with solid lubricants can be used; these materials maintain good self-lubricating and wear-resistant properties even under heavy loads and high temperatures. The self-lubricating wear-resistant plate 7 is positioned at the top of the slide column 2, its main function being to reduce contact friction between the top of the slide column 2 and transmission components such as the pull-back block 4, preventing surface damage and wear caused by frequent transmission.

[0080] Through the above technical solution, a self-lubricating copper sleeve 6 is installed in the channel 11 of the base column 1. Utilizing the inherent lubrication characteristics of the self-lubricating copper sleeve 6, the sliding friction resistance between the sliding column 2 and the channel wall is effectively reduced when the sliding column 2 moves within the channel 11, thereby significantly reducing the wear of the base column 1 and the sliding column 2. Simultaneously, a self-lubricating wear-resistant plate 7 is installed at the top of the sliding column 2. Utilizing the low friction and high wear resistance of the self-lubricating wear-resistant plate 7, the contact friction between the top of the sliding column 2 and transmission components such as the pull-back block 4 is effectively reduced, avoiding surface damage caused by frequent transmission. The introduction of these self-lubricating components works synergistically on the motion path and transmission interface of the entire mechanism, not only significantly extending the service life of the springless guide column type wedge mechanism, but also significantly reducing the need for external lubrication and daily maintenance, achieving a maintenance-free design. Therefore, the springless guide column type wedge mechanism of this application can maintain a highly efficient and stable working state during long-term operation, effectively solving the problems of high maintenance frequency and increased costs caused by friction and wear in the prior art, further improving the reliability and economy of the mechanism.

[0081] The following example will provide a more detailed explanation of the above technical solution:

[0082] In an automotive stamping die, lateral forming of the workpiece is required. Traditional wedge mechanisms typically rely on return springs for resetting, which necessitates the removal of multiple side plate blocks during assembly and disassembly—a time-consuming and complex process. Furthermore, the springs themselves are prone to fatigue failure, increasing maintenance frequency and costs. To address these issues, a guide post type wedge mechanism without a return spring was employed.

[0083] The base column 1 of the mechanism is fixed to the lower mold base of the mold, and has an axially penetrating channel 11 inside. The sliding column 2 is installed within the channel 11 and can move axially within it. The outer surface of the sliding column 2 has a groove 21 extending axially, and the end of the groove 21 has a limiting step 22. An anti-rotation block 3 is disposed within the channel 11 of the base column 1, and its outer end face contacts the groove 21 of the sliding column 2. When the sliding column 2 moves within the channel 11, the rotational torque it may generate is transmitted to the anti-rotation block 3 through the groove 21 and is counteracted by the anti-rotation block 3, thereby ensuring that the sliding column 2 only moves linearly without rotation, improving forming accuracy. The anti-rotation block 3 can be temporarily removed during the installation of the sliding column 2 to facilitate assembly operations.

[0084] The top of the sliding column 2 extends out of the base column 1 and is connected to the pull-back block 4 via a first transmission structure. This first transmission structure includes a set of mounting grooves 23 symmetrically arranged on the outer circumferential surface of the top of the sliding column 2, and a set of first protrusions 41 symmetrically arranged at the bottom of the pull-back block 4. The first protrusions 41 of the pull-back block 4 slide into the mounting grooves 23 of the sliding column 2 from the side, forming a reliable connection.

[0085] The top of the pull-back block 4 is connected to the drive block 5 via another set of first transmission structures. This first transmission structure includes a set of symmetrically arranged limiting grooves 51 at the bottom of the drive block 5, and a set of symmetrically arranged second protrusions 42 at the top of the pull-back block 4. The second protrusions 42 of the pull-back block 4 slide into the limiting grooves 51 of the drive block 5 from the side. To achieve a rigid connection between the pull-back block 4 and the drive block 5, a fixed connection structure is used. This fixed connection structure includes several inner connecting holes 52 formed within the limiting grooves 51, and outer connecting holes 43 formed on the second protrusions 42. When the second protrusions 42 slide into the limiting grooves 51, the outer connecting hole 43 aligns with a corresponding inner connecting hole 52 and is fixed by bolts. This rigid connection ensures that the movement of the drive block 5 can be directly and accurately transmitted to the pull-back block 4, thereby driving the sliding column 2.

[0086] The drive block 5 is connected to the upper die drive device of the mold (e.g., the slide block of a stamping press). When the upper die descends, the drive block 5 moves downward, pushing the slide column 2 downward via the pull-back block 4, thus completing the lateral forming of the workpiece. When the upper die rises, the drive block 5 moves upward, directly pulling the slide column 2 back to its initial position along the channel 11 through its rigid connection with the pull-back block 4 and the connection between the pull-back block 4 and the slide column 2. This design completely eliminates the need for a return spring in traditional mechanisms, avoids the problem of spring fatigue failure, and simplifies the structure of the mechanism.

[0087] Compared to traditional wedge mechanisms that rely on return springs, this mechanism achieves the reciprocating motion of the slide column 2 through direct mechanical linkage between the drive block 5 and the pull-back block 4, eliminating the need for a return spring and significantly reducing structural complexity. During assembly and disassembly, the absence of spring assemblies and the use of slide-in connections and bolts for fixing components make disassembly and installation more convenient, eliminating the need to remove numerous side plate blocks. For example, when the slide column 2 needs to be replaced, simply loosening the connecting bolts allows the pull-back block 4 to be separated from the drive block 5, making it easy to remove the slide column 2.

[0088] To further improve the durability of the mechanism and reduce maintenance requirements, a self-lubricating copper sleeve 6 is installed in the channel 11 of the base column 1, and a self-lubricating wear-resistant plate 7 is installed at the top of the slide column 2. These self-lubricating components reduce friction and wear, allowing the mechanism to operate without additional lubrication during long-term operation, achieving a maintenance-free design and reducing operating costs. In addition, the length of the slide column 2 can be flexibly selected according to the mold thickness, working stroke, and required working angle. For example, any working angle can be requested as the design dimension in increments of 0.01°, greatly improving the adaptability of the mechanism to different molds and process requirements.

[0089] In this document, the terms "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," "outer," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the clarity of expressing the technical solution and for the convenience of description, and therefore should not be construed as limiting the present invention.

[0090] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0091] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A guide post type wedge mechanism without a return spring, characterized in that, It includes a base column (1) with an axially penetrating channel (11) inside; a sliding column (2) movably disposed inside the base column (1) and movable along the channel (11); an anti-rotation block (3) disposed inside the channel (11) of the base column (1) to limit the direction of movement of the sliding column (2) and prevent the sliding column (2) from rotating during movement; a pull-back block (4) connected to and used as a transmission mechanism for the sliding column (2) and the drive block (5); and a drive block (5) connected to a drive device and driven by the pull-back block (4) to move the sliding column (2) within the channel (11) of the base column (1).

2. The guide post type wedge mechanism without return spring according to claim 1, characterized in that, The outer surface of the sliding column (2) is provided with a sliding groove (21), which is arranged along the axial direction of the sliding column (2). A limiting step (22) is provided at the end of the sliding groove (21). After the sliding column (2) is installed into the channel (11), the sliding groove (21) contacts the outer end face of the anti-rotation block (3). During the movement of the sliding column (2) along the channel (11), the rotational torque generated by the sliding column (2) is transmitted to the anti-rotation block (3) through the sliding groove (21), and the anti-rotation block (3) cancels out the rotational torque.

3. The guide post type wedge mechanism without return spring according to claim 1, characterized in that, The top of the sliding column (2) extends out of the base column (1) and is connected to the pull-back block (4) through the first transmission structure; the first transmission structure includes a set of mounting grooves (23) symmetrically arranged on the outer circumferential surface of the top of the sliding column (2) and a set of first protrusions (41) symmetrically arranged at the bottom of the pull-back block (4); the first protrusion (41) of the pull-back block (4) slides into the mounting groove (23) of the sliding column (2) from the side, and can pull the sliding column (2) upward along the channel (11) under the action of the drive block (5).

4. The guide post type wedge mechanism without return spring according to claim 1, characterized in that, The pull-back block (4) is connected to the drive block (5) via a first transmission structure. The first transmission structure includes a set of limiting grooves (51) symmetrically arranged at the bottom of the drive block (5) and a set of second protrusions (42) symmetrically arranged at the top of the pull-back block (4). The second protrusions (42) of the pull-back block (4) slide into the limiting grooves (51) of the drive block (5) from the side and are rigidly connected to the drive block (5) via a fixed connection structure.

5. The guide post type wedge mechanism without return spring according to claim 4, characterized in that, The fixed connection structure includes a plurality of inner connection holes (52) opened in the limiting groove (51) and an outer connection hole (43) opened on the second protrusion (42); the inner connection holes (52) are distributed along the length direction of the limiting groove (51). After the second protrusion (42) slides into the limiting groove (51) of the drive block (5) from the side, the outer connection hole (43) is aligned with a corresponding inner connection hole (52) and fixed by bolt connection, so as to realize the rigid connection between the pull-back block (4) and the drive block (5).

6. The guide post type wedge mechanism without return spring according to claim 4, characterized in that, The base column (1) is provided with a self-lubricating copper sleeve (6) in the channel (11), and the top of the sliding column (2) is provided with a self-lubricating wear-resistant plate (7).

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