High-speed railway axle box shell casting equipment based on iron mold coated sand production line

Abstract

This application relates to the field of casting equipment technology and discloses a high-speed rail axle box shell casting equipment based on a coated sand production line for iron molds. The equipment includes a lower mold box and an upper mold box positioned above the lower mold box. A clamping device for holding the upper mold box is provided above it. Two symmetrically fixed positioning pins are installed on the top of the lower mold box, and two symmetrically positioned grooves are formed on the bottom of the upper mold box. By squeezing the hydraulic medium in the main cylinder and auxiliary cylinder through the auxiliary piston rod, the positioning plates move and squeeze the positioning pins, thus buffering and positioning the pins, extending their service life, and reducing the probability of collision between the lower and upper mold boxes during mold closing due to rigid engagement between the positioning pins and the positioning grooves, affecting mold stability. This achieves the mold closing positioning accuracy requirements. After mold closing, the pressure value detected by the pressure sensor is collected to determine the wear condition of the positioning pins and positioning plates, facilitating timely maintenance.

Description

Technical Field

[0001] This application relates to the field of casting equipment technology, and in particular to high-speed rail axle box shell casting equipment based on iron mold coated sand production line. Background Technology

[0002] As the core component of the bogie, the casting process of the high-speed railway axle box is crucial to ensuring the safe and stable operation of the high-speed railway. In order to ensure the quality of the casting and prevent the molten iron from reacting with the metal mold and causing the formation of a hard and brittle "white iron" structure on the surface of the mold casting, molds made of coated sand are often used for casting the axle box shell.

[0003] After manufacturing a mold that matches the shape of the axle box shell using coated sand, the upper and lower mold boxes supporting the mold need to be closed before casting. During mold closure, to ensure the accuracy of the closure, locating pins and locating holes are often used to position and correct the upper and lower mold boxes. If the upper and lower mold boxes deviate from each other during the process of approaching each other before closure, the locating pins and locating holes can help them reset. However, since the locating pins and locating holes are rigidly engaged without buffering, this not only causes collisions during the closure of the upper and lower mold boxes, affecting the stability of the upper and lower molds, but also accelerates the wear rate of the locating pins and locating holes, affecting the subsequent closure accuracy of the upper and lower mold boxes, resulting in more burrs on the surface of the casting and affecting the casting quality. Summary of the Invention

[0004] This application proposes a high-speed rail axle box shell casting equipment based on a coated sand production line. It features buffer positioning of the positioning pins during the pressing process via the moving positioning plate, extending the pins' service life and reducing the probability of collisions between the lower and upper mold boxes during mold closing, which could affect mold stability. This achieves the required mold closing positioning accuracy. Furthermore, it collects pressure values ​​detected by a pressure sensor after mold closing to determine the wear state of the positioning pins and positioning plate, facilitating timely maintenance. This solves the problem of shortened pin lifespan due to rigid positioning between the positioning pins and positioning holes during the mold closing process, which affects mold closing stability and casting quality.

[0005] To achieve the above objectives, this application adopts the following technical solution: a high-speed rail axle box shell casting equipment based on an iron mold coated sand production line, including a lower mold box and an upper mold box disposed above the lower mold box. A clamping device for holding the upper mold box is disposed above the upper mold box. Two positioning pins are symmetrically fixedly installed on the top of the lower mold box. Two positioning grooves are symmetrically opened on the bottom of the upper mold box. Multiple positioning plates are slidably installed inside the positioning grooves. Multiple main cylinders are fixedly installed inside the upper mold box, and each main cylinder is adapted to a corresponding positioning plate. A main piston rod is slidably mounted on one end of the main cylinder body near the positioning plate and is slidably connected to the positioning plate. A secondary cylinder body is fixedly connected to the end of the main cylinder body away from the positioning plate. Both the rodless chambers of the main cylinder body and the secondary cylinder body are filled with hydraulic medium. A secondary piston rod is slidably mounted on the end of the secondary cylinder body away from the main cylinder body. The end of the secondary piston rod away from the secondary cylinder body moves through the upper mold box and toward the lower mold box. During the process of the clamping device and the upper mold box moving to the lower mold box driven by the drive source, the hydraulic medium flows through the compression of the secondary piston rod by the lower mold box to buffer and position the positioning pin through the positioning plate.

[0006] Furthermore, the multiple positioning plates are arranged in a circular array around the axis of the positioning groove, and the side of the positioning plate closest to the positioning groove is either in contact with or separate from the positioning pin.

[0007] Furthermore, a piston is airtightly slidably installed inside the main cylinder, and the piston is fixedly connected to the main piston rod. A return spring is fitted on the outer side of the main piston rod, and the two ends of the return spring are fixedly connected to the inner wall of the main cylinder and the piston, respectively.

[0008] Furthermore, the axis of the auxiliary cylinder is parallel to the axis of the positioning groove, and the inner diameter of the auxiliary cylinder is smaller than the inner diameter of the main cylinder.

[0009] Furthermore, the upper mold box is provided with a positioning hole that communicates with the positioning groove, and the inner diameter of the positioning hole is the same as the diameter of the positioning pin. A buffer spring is fixedly installed on the inner wall of the positioning hole, and a top plate is fixedly installed on the end of the buffer spring away from the positioning hole.

[0010] Furthermore, two connecting plates are symmetrically and movably installed on the top of the upper mold box. The bottom end of the connecting plate movably passes through the upper mold box and is fixedly connected to the corresponding positioning plate. The upper mold box is provided with a sliding groove that is slidably connected to the connecting plate.

[0011] Furthermore, a side pressure plate that is either attached to or separate from the slide groove is fixedly installed at the bottom of the clamping device. A pressure sensor is fixedly installed on the side of the side pressure plate near the connecting plate, and the pressure sensor is electrically connected to the controller.

[0012] Furthermore, a ball bearing is rotatably mounted at the end of the auxiliary piston rod away from the auxiliary cylinder body, which is used to replace the sliding friction between the auxiliary piston rod and the lower mold box through rolling friction between the ball bearing and the lower mold box.

[0013] Furthermore, a limiting ring is rotatably installed at the end of the main piston rod away from the main cylinder, and the diameter of the limiting ring is larger than the diameter of the main piston rod. A limiting groove is provided on the side of the positioning plate near the main piston rod, which is slidably connected to the limiting ring and the main piston rod.

[0014] The beneficial effects of this invention are as follows:

[0015] The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line provided in this application, during the mold closing process of the upper mold box and the lower mold box, uses the auxiliary piston rod to squeeze the hydraulic medium in the main cylinder and the auxiliary cylinder, causing each positioning plate to move and squeeze the positioning pin, thus buffering and positioning the positioning pin, extending the service life of the positioning pin, reducing the probability of the lower mold box and the upper mold box colliding and affecting the stability of the mold due to the rigid jamming of the positioning pin and the positioning groove during the mold closing process, thereby achieving the mold closing positioning accuracy requirements, and collecting the pressure value detected by the pressure sensor after mold closing to judge the wear state of the positioning pin and the positioning plate, which facilitates timely maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a side cross-sectional view of the positioning groove and positioning hole of the present invention.

[0019] Figure 3 This is a side cross-sectional view of the positioning plate, main cylinder, and auxiliary cylinder of the present invention.

[0020] In the diagram: 1. Lower mold box; 2. Upper mold box; 3. Positioning pin; 4. Positioning groove; 5. Positioning plate; 6. Main cylinder body; 7. Main piston rod; 701. Limiting ring; 702. Limiting slide groove; 8. Secondary cylinder body; 9. Secondary piston rod; 10. Positioning hole; 11. Buffer spring; 12. Top plate; 13. Piston; 14. Return spring; 15. Connecting plate; 16. Slide groove; 17. Ball bearing; 18. Side pressure plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] See Figures 1 to 3 The high-speed rail axle box shell casting equipment based on the coated sand production line includes a lower mold box 1 and an upper mold box 2 positioned above the lower mold box 1. The upper mold box 2 is clamped by a clamping device. When producing the mold using coated sand, the lower mold is supported by the lower mold box 1, and the upper mold is supported by the upper mold box 2. During mold closing, the lower mold box 1 is transported to directly below the upper mold box 2 by a conveying device. Then, a drive source moves the clamping device and the upper mold box 2 downwards until the upper mold box 2 is aligned with the lower mold box 1. After the mold is closed, the clamping device releases the upper mold box 2 and drives the upper mold box 2 to move upward and reset through the drive source, in preparation for clamping the next upper mold box 2. After the mold is closed, the lower mold box 1 and the upper mold box 2 are transported to the pouring point by the conveying device for pouring. During the process of transporting the lower mold box 1 and the upper mold box 2 to the pouring point, the drive source tightens and reinforces the box hooks between the lower mold box 1 and the upper mold box 2 to further ensure the sealing of the mating surface of the lower mold box 1 and the upper mold box 2.

[0023] Two positioning pins 3 are symmetrically fixedly installed on the top of the lower mold box 1, and two positioning grooves 4 are symmetrically opened on the bottom of the upper mold box 2. Each positioning pin 3 is adapted to the corresponding positioning groove 4, and the diameter of the positioning groove 4 is larger than the diameter of the positioning pin 3, so as to ensure that the positioning pin 3 can be inserted into the interior of the positioning groove 4 when the upper mold box 2 moves down. Multiple positioning plates 5 are slidably installed inside the positioning groove 4. The multiple positioning plates 5 are arranged in a ring array around the axis of the positioning groove 4. The positioning plates 5 are arc-shaped, and the side of the positioning plate 5 close to the axis of the positioning groove 4 can fit against the outer surface of the positioning pin 3. That is, after the multiple positioning plates 5 move towards the axis of the positioning groove 4, they can jointly wrap and clamp the positioning pin 3 inserted into the positioning groove 4, thus limiting the positioning pin 3.

[0024] Multiple main cylinders 6 are fixedly installed on the inner wall of the positioning groove 4, and each main cylinder 6 is adapted to a corresponding positioning plate 5. A piston 13 is airtightly slidably installed inside the main cylinder 6. A main piston rod 7 is fixedly installed on one side of the piston 13. The end of the main piston rod 7 away from the piston 13 slides through the side wall of the main cylinder 6 and is limited and slidably connected to the positioning plate 5. That is, the positioning plate 5 and the main piston rod 7 can slide relative to each other in the vertical direction, but the positioning plate 5 will not separate from the main piston rod 7. The rodless chamber of the main cylinder 6 is fixedly connected to the auxiliary cylinder 8. The axis of the auxiliary cylinder 8 is... The auxiliary cylinder 8 is set parallel to the axis of the positioning groove 4 and is fixedly installed inside the upper mold box 2. The auxiliary piston rod 9 is slidably installed at the end of the auxiliary cylinder 8 away from the main cylinder 6. The end of the auxiliary piston rod 9 away from the auxiliary cylinder 8 moves through the upper mold box 2 and is set towards the lower mold box 1. The rodless cavity of the main cylinder 6 and the rodless cavity of the auxiliary cylinder 8 are filled with hydraulic medium. When the drive source drives the clamping device and the upper mold box 2 to move to the lower mold box 1, as the positioning pin 3 begins to insert into the positioning groove 4, the end of the auxiliary piston rod 9 near the lower mold box 1 gradually comes into contact with the upper surface of the lower mold box 1.

[0025] Under the pressure between the lower mold box 1 and the upper mold box 2, the hydraulic medium in the rodless chamber of the auxiliary cylinder 8 gradually flows into the rodless chamber of the main cylinder 6, thereby pressing the piston 13. This causes the main piston rod 7 to drive the positioning plate 5 to move towards the axis of the positioning groove 4, so that the positioning plate 5 gradually comes into contact with the positioning pin 3. When the positioning plate 5 comes into contact with the positioning pin 3 but the lower mold box 1 and the upper mold box 2 are not yet fully in contact, the pressure of the lower mold box 1 on the auxiliary piston rod 9 continues. At this time, the friction between the positioning plate 5 and the positioning pin 3 increases to a level sufficient to make the positioning plate 5 move synchronously with the positioning pin 3. Therefore, the positioning plate 5 and the main piston rod 7 are connected by a limiting sliding connection. Positioning plate 5 provides the conditions for movement, preventing the positioning plate 5 from interfering with the normal positioning and engagement of positioning pin 3 due to its inability to move. When the lower mold box 1 and the upper mold box 2 are in contact, the auxiliary piston rod 9 is also pressed into the upper mold box 2. That is, the auxiliary piston rod 9 will not protrude and affect the sealing of the contact surface between the lower mold box 1 and the upper mold box 2. Finally, during the process of each positioning plate 5 moving and squeezing the positioning pin 3, the positioning pin 3 is corrected and positioned, reducing the probability of the lower mold box 1 and the upper mold box 2 colliding and affecting the stability of the mold due to the rigid engagement of the positioning pin 3 and the positioning groove 4 during the mold closing process. This makes the axis of the positioning pin 3 coincide with the axis of the positioning groove 4, thereby achieving the mold closing positioning accuracy requirements.

[0026] A limiting ring 701 is rotatably mounted on the end of the main piston rod 7 away from the main cylinder 6, and the diameter of the limiting ring 701 is larger than the diameter of the main piston rod 7. A limiting groove 702 is provided on the side of the positioning plate 5 near the main piston rod 7, which is slidably connected to the limiting ring 701 and the main piston rod 7. Since the diameter of the limiting ring 701 is larger than the diameter of the main piston rod 7, the limiting ring 701 will not fall out of the limiting groove 702 when it slides in the limiting groove 702, thus achieving the purpose of limiting and sliding connection between the main piston rod 7 and the positioning plate 5.

[0027] A return spring 14 is fitted on the outer side of the main piston rod 7. Both ends of the return spring 14 are fixedly connected to the inner wall of the main cylinder 6 and the piston 13, respectively. After the casting is completed and cooled by the upper and lower molds housed in the lower mold box 1 and upper mold box 2, the return spring 14 is in a compressed state. When the lower mold box 1 separates from the upper mold box 2 for demolding, the clamping device and the upper mold box 2 move upwards via the drive source. Under the action of friction between the positioning pin 3 and the positioning plate 5, the positioning plate 5 first slides towards the lower mold box 1 under the action of friction. As the gap between the lower mold box 1 and the upper mold box 2 increases, the return spring 14, under its elastic force... As the piston 13 moves, the positioning plate 5 moves toward the main cylinder 6 via the main piston rod 7. The hydraulic medium in the rodless chamber of the main cylinder 6 is squeezed into the rodless chamber of the auxiliary cylinder 8, causing the positioning plate 5 to gradually separate from the positioning pin 3. This allows the positioning pin 3 to separate and reset normally from the positioning groove 4. The auxiliary piston rod 9 and the ball 17 also move away from the auxiliary cylinder 8 under the action of the hydraulic medium and extend out of the lower surface of the upper mold box 2. Therefore, before the mold is closed, sufficient space needs to be reserved between the upper and lower mold boxes 1 and the upper mold box 2 in the vertical direction to prevent the auxiliary piston rod 9 and the ball 17 from being squeezed and collided when the lower mold box 1 and the upper mold box 2 are not closed.

[0028] During the mold closing process between the lower mold box 1 and the upper mold box 2, the positioning plate 5 is pressed and positioned against the positioning pin 3 by transmission. The incompressibility of the hydraulic medium ensures the positioning accuracy. Compared with mechanical transmission (such as gear rack, bevel gear set or wedge block, etc.) to convert the vertical displacement into the horizontal displacement, the hydraulic medium will not be worn or lost. Even if the initial position of each positioning plate 5 may be slightly deviated during the reset process of each return spring 14, the final position of each positioning plate 5 remains fixed during the final fitting process of the lower mold box 1 and the upper mold box 2. This reduces the probability of reduced positioning accuracy due to structural wear and ensures the mold closing accuracy.

[0029] A ball bearing 17 is rotatably mounted on one end of the auxiliary piston rod 9 near the lower mold box 1. During the mold closing process of the lower mold box 1 and the upper mold box 2, if there is a slight displacement deviation between the lower mold box 1 and the upper mold box 2 while the positioning plate 5 is clamping the positioning pin 3 for positioning, the lower mold box 1 and the upper mold box 2 will move relative to each other to be corrected under the positioning action between the positioning pin 3 and the positioning plate 5. During the movement of the lower mold box 1 and the upper mold box 2, the ball bearing 17 rolls on the surface of the lower mold box 1 to replace sliding friction with rolling friction, thereby reducing the friction between the auxiliary piston rod 9 and the lower mold box 1 and preventing wear of the auxiliary piston rod 9.

[0030] The upper mold box 2 is also provided with a positioning hole 10 that communicates with the positioning groove 4. The inner diameter of the positioning hole 10 is the same as the diameter of the positioning pin 3. A buffer spring 11 is fixedly installed on the inner wall of the positioning hole 10. A top plate 12 is fixedly installed on the end of the buffer spring 11 away from the positioning hole 10. When the positioning pin 3 is inserted into the positioning groove 4 and under the positioning action of each positioning plate 5, the axis of the positioning pin 3 and the positioning groove 4 gradually coincides. The axis of the positioning pin 3 and the top plate 12 also gradually coincides. When the positioning pin 3 presses the top plate 12, the buffer spring 11 is also compressed. The buffer spring 11 and the top plate 12 buffer the positioning pin 3, preventing the positioning pin 3 from directly contacting the inner wall of the positioning groove 4 and causing vibration of the mold in the lower mold box 1 and the upper mold box 2. This further ensures the stability of the lower mold box 1 and the upper mold box 2 during the mold closing process.

[0031] Two connecting plates 15 are symmetrically and movably installed on the top of the upper mold box 2. The bottom end of the connecting plate 15 movably passes through the upper mold box 2 and is fixedly connected to the corresponding positioning plate 5. The upper mold box 2 is provided with a sliding groove 16 that is slidably connected to the connecting plate 15. A side pressure plate 18 is fixedly installed at the bottom of the clamping device. When the positioning plate 5 is in contact with the positioning pin 3, the positioning plate 5 drives the connecting plate 15 to slide along the sliding groove 16 until it is in contact with the side pressure plate 18. A pressure sensor is fixedly installed on the side of the side pressure plate 18 near the connecting plate 15, and the pressure sensor is electrically connected to the controller. After the lower mold box 1 and the upper mold box 2 complete the mold closing, the pressure sensor detects the pressure of the connecting plate 15 on the side pressure plate 18 and records the value.

[0032] Since the pressing stroke of the auxiliary piston rod 9 is limited by the mold closing stroke of the upper mold box 2 and the lower mold box 1, when the contact surface between the positioning plate 5 and the positioning pin 3 is not worn, the positioning plate 5 moves a short distance inward from its initial position and contacts the positioning pin 3 and stops. During the continued pressing of the auxiliary piston rod 9, the main piston rod 7 slides relative to the positioning plate 5, the return spring 14 is fully compressed, and the pressure of the connecting plate 15 on the side pressure plate 18 reaches the design threshold. When there is a slight relative displacement in the horizontal direction when the lower mold box 1 and the upper mold box 2 are molded, the positioning pin 3 is biased towards one side of the positioning groove 4. The positioning plate 5 on this side contacts the positioning pin 3 first and bears greater pressure, while the other side contacts later or the pressure is less. The pressure difference monitored by the pressure sensors on both sides increases, indicating that there is a misalignment during mold closing or uneven wear on both sides.

[0033] When the mating surfaces of the positioning pin 3 or the positioning plate 5 wear down, the effective clamping diameter of the positioning pin 3 decreases (or the effective clamping thickness of the positioning plate 5 decreases). The positioning plate 5 needs to move inward a longer distance to contact the positioning pin 3. Under the same mold closing stroke, the effective compression stroke of the return spring 14 decreases, and the pressure of the connecting plate 15 on the side pressure plate 18 is lower than the design threshold. Therefore, if the difference between the pressure values ​​monitored by the two pressure sensors is large, or if the pressure values ​​monitored by the two pressure sensors are both less than the threshold range, it indicates that the mating surfaces of the positioning pin 3 and the positioning plate 5 are worn extensively. The positioning plate 5 may not be able to effectively fit the positioning pin 3, and timely maintenance of the positioning pin 3 and the positioning plate 5 is required.

[0034] Working principle:

[0035] During mold closing, the lower mold box 1 is conveyed to the area directly below the upper mold box 2 via a conveying device. Then, a drive source moves the clamping device and the upper mold box 2 downwards. As the positioning pin 3 inserts into the positioning groove 4, the end of the auxiliary piston rod 9 near the lower mold box 1 gradually comes into contact with the upper surface of the lower mold box 1. Under the pressure between the lower mold box 1 and the upper mold box 2, the hydraulic medium in the rodless chamber of the auxiliary cylinder 8 gradually flows into the rodless chamber of the main cylinder 6, thereby pressing the piston 13. The return spring 14 is compressed, causing the main piston rod 7 to drive the positioning plate 5 towards... The positioning groove 4 moves along the axial direction so that the positioning plate 5 gradually comes into contact with the positioning pin 3. When the positioning plate 5 comes into contact with the positioning pin 3 but the lower mold box 1 and the upper mold box 2 are not completely in contact, the lower mold box 1 continues to squeeze the auxiliary piston rod 9. At this time, the friction between the positioning plate 5 and the positioning pin 3 increases to a level sufficient to make the positioning plate 5 move synchronously with the positioning pin 3. Therefore, the positioning plate 5 is provided with the moving conditions by the limiting sliding connection between the positioning plate 5 and the main piston rod 7, preventing the positioning plate 5 from interfering with the normal positioning and locking of the positioning pin 3 due to its inability to move.

[0036] Finally, the locating pin 3 presses against the top plate 12, and the buffer spring 11 is also compressed. The buffer spring 11 and the top plate 12 buffer the locating pin 3, preventing the locating pin 3 from directly contacting the inner wall of the locating groove 4 and causing vibration in the molds inside the lower mold box 1 and upper mold box 2. This further ensures the stability of the lower mold box 1 and upper mold box 2 during the mold closing process. Ultimately, the purpose of using the mold closing action itself to push the various locating plates 5 to move and press against the locating pin 3 is achieved, so as to correct and position the locating pin 3 and reduce the probability of the lower mold box 1 and upper mold box 2 colliding and affecting the stability of the mold due to the rigid engagement of the locating pin 3 and the locating groove 4 during the mold closing process. The positioning plate 5 first clamps and positions the positioning pin 3, and then moves it in a limited sliding mechanism, which solves the contradiction between rigid positioning and flexible correction, thereby achieving the mold closing positioning accuracy requirements. Then, the clamping device is released from the upper mold box 2 and the clamping device is driven to move up and reset by the drive source to prepare for clamping the next upper mold box 2. After the mold is closed, the lower mold box 1 and the upper mold box 2 are transported to the pouring point by the conveying device for pouring. During the process of the lower mold box 1 and the upper mold box 2 being transported to the pouring point, the drive source tightens and reinforces the box hooks between the lower mold box 1 and the upper mold box 2 to further ensure the sealing of the mating surface of the lower mold box 1 and the upper mold box 2.

[0037] Since the pressing stroke of the auxiliary piston rod 9 is limited by the mold closing stroke of the upper mold box 2 and the lower mold box 1, when the contact surface between the positioning plate 5 and the positioning pin 3 is not worn, the positioning plate 5 moves a short distance inward from its initial position and contacts the positioning pin 3 and stops. During the continued pressing of the auxiliary piston rod 9, the main piston rod 7 slides relative to the positioning plate 5, the return spring 14 is fully compressed, and the pressure of the connecting plate 15 on the side pressure plate 18 reaches the design threshold. When there is a slight relative displacement in the horizontal direction when the lower mold box 1 and the upper mold box 2 are molded, the positioning pin 3 is biased towards one side of the positioning groove 4. The positioning plate 5 on this side contacts the positioning pin 3 first and bears greater pressure, while the other side contacts later or the pressure is less. The pressure difference monitored by the pressure sensors on both sides increases, indicating that there is a misalignment during mold closing or uneven wear on both sides.

[0038] When the mating surfaces of the positioning pin 3 or the positioning plate 5 are worn, the effective clamping diameter of the positioning pin 3 decreases (or the effective clamping thickness of the positioning plate 5 decreases). The positioning plate 5 needs to move inward a longer distance to contact the positioning pin 3. Under the same mold closing stroke, the effective compression stroke of the return spring 14 decreases, and the pressure of the connecting plate 15 on the side pressure plate 18 is lower than the design threshold. Therefore, if the difference between the pressure values ​​monitored by the two pressure sensors is large, or if the pressure values ​​monitored by the two pressure sensors are both less than the threshold range, it indicates that the mating surfaces of the positioning pin 3 and the positioning plate 5 are worn extensively, and the positioning plate 5 may not be able to effectively fit the positioning pin 3. Timely maintenance of the positioning pin 3 and the positioning plate 5 is required.

[0039] After the casting is completed and cooled by the upper and lower molds mounted on the lower mold box 1 and upper mold box 2, when the lower mold box 1 and upper mold box 2 are separated and demolded, the clamping equipment and upper mold box 2 are driven upward by the drive source. Under the action of friction between the positioning pin 3 and the positioning plate 5, the positioning plate 5 first slides towards the lower mold box 1 under the action of friction. As the gap between the lower mold box 1 and upper mold box 2 increases, under the action of the spring force of the return spring 14, the piston 13 gradually drives the positioning plate 5 towards the main cylinder 6 through the main piston rod 7. The hydraulic medium in the rodless cavity of the main cylinder 6 is squeezed into the rodless cavity of the auxiliary cylinder 8, so that the positioning plate 5 gradually separates from the positioning pin 3, and then the positioning pin 3 and the positioning groove 4 can be normally separated and reset.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-speed rail axle box shell casting equipment based on a coated sand production line, comprising a lower mold box (1) and an upper mold box (2) disposed above the lower mold box (1), wherein a clamping device for clamping the upper mold box (2) is disposed above the upper mold box (2), characterized in that, Two positioning pins (3) are symmetrically fixedly installed on the top of the lower mold box (1). Two positioning grooves (4) are symmetrically opened on the bottom of the upper mold box (2). Multiple positioning plates (5) are slidably installed inside the positioning grooves (4). Multiple main cylinders (6) are fixedly installed inside the upper mold box (2), and each main cylinder (6) is adapted to the corresponding positioning plate (5). A main piston rod (7) that is slidably connected to the positioning plate (5) is slidably installed on the end of the main cylinder (6) near the positioning plate (5). The end of the main cylinder (6) away from the positioning plate (5) is fixedly fixed. A secondary cylinder (8) is connected to the main cylinder (6), and the rodless chambers of both the main cylinder (6) and the secondary cylinder (8) are filled with hydraulic medium. A secondary piston rod (9) is slidably installed at the end of the secondary cylinder (8) away from the main cylinder (6). The end of the secondary piston rod (9) away from the secondary cylinder (8) moves through the upper mold box (2) and toward the lower mold box (1). During the process of the clamping device and the upper mold box (2) moving toward the lower mold box (1) driven by the drive source, the hydraulic medium flows through the squeezing of the secondary piston rod (9) by the lower mold box (1) to buffer and position the positioning pin (3) through the positioning plate (5).

2. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 1, characterized in that, The multiple positioning plates (5) are arranged in a ring array around the axis of the positioning groove (4), and the side of the positioning plate (5) closest to the positioning groove (4) is either attached to or separated from the positioning pin (3).

3. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 2, characterized in that, The piston (13) is airtightly slidably installed inside the main cylinder (6), and the piston (13) is fixedly connected to the main piston rod (7). A return spring (14) is fitted on the outside of the main piston rod (7), and the two ends of the return spring (14) are fixedly connected to the inner wall of the main cylinder (6) and the piston (13) respectively.

4. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 1, characterized in that, The axis of the sub-cylinder (8) is parallel to the axis of the positioning groove (4), and the inner diameter of the sub-cylinder (8) is smaller than the inner diameter of the main cylinder (6).

5. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 1, characterized in that, The upper mold box (2) is also provided with a positioning hole (10) that communicates with the positioning groove (4), and the inner diameter of the positioning hole (10) is the same as the diameter of the positioning pin (3). A buffer spring (11) is fixedly installed on the inner wall of the positioning hole (10), and a top plate (12) is fixedly installed on the end of the buffer spring (11) away from the positioning hole (10).

6. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 1, characterized in that, Two connecting plates (15) are symmetrically and movably installed on the top of the upper mold box (2). The bottom end of the connecting plate (15) movably passes through the upper mold box (2) and is fixedly connected to the corresponding positioning plate (5). The upper mold box (2) is provided with a sliding groove (16) that is slidably connected to the connecting plate (15).

7. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 6, characterized in that, The bottom of the clamping device is fixedly installed with a side pressure plate (18) that is either attached to or separated from the slide (16). A pressure sensor is fixedly installed on the side of the side pressure plate (18) near the connecting plate (15), and the pressure sensor is electrically connected to the controller.

8. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 1, characterized in that, The auxiliary piston rod (9) is rotatably mounted with a ball (17) at the end away from the auxiliary cylinder (8), which is used to replace the sliding friction between the auxiliary piston rod (9) and the lower mold box (1) by the rolling friction between the ball (17) and the lower mold box (1).

9. The high-speed rail axle box shell casting equipment based on the iron mold coated sand production line according to claim 1, characterized in that, A limiting ring (701) is rotatably installed at the end of the main piston rod (7) away from the main cylinder (6), and the diameter of the limiting ring (701) is larger than the diameter of the main piston rod (7). A limiting groove (702) is provided on the side of the positioning plate (5) near the main piston rod (7) to slide and connect with the limiting ring (701) and the main piston rod (7).

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