A mold changing device

Abstract

This utility model discloses a mold changing device, belonging to the field of vulcanizing machine technology. It includes a pot lid and a mold connecting plate connected to the mold. Several quick-change devices are evenly distributed around the circumference of the pot lid. Each quick-change device includes a pull rod with a T-shaped block at its lower end. Several connecting holes are evenly distributed around the circumference of the pot lid corresponding to the pull rod, and the pull rod extends through the connecting holes to the bottom of the pot lid. Several elongated slots are evenly distributed around the circumference of the mold connecting plate. The T-shaped block of each quick-change device can engage with the corresponding elongated slot and extend into the bottom of the slot. Each pull rod has a swing drive structure and a first lifting drive device at its upper end. The first lifting drive device drives the pull rod to rotate through the swing drive structure. Each pull rod is also connected to a second lifting drive device, which drives the pull rod to move up and down. This structure can automatically realize the rapid connection and separation of the mold and the vulcanizing machine, eliminating the problems of cumbersome mold installation and disassembly, and high safety risks associated with working at heights.

Description

Technical Field

[0001] This utility model relates to the field of vulcanizing machine technology, specifically to a mold changing device. Background Technology

[0002] Currently, when installing or disassembling molds on tire vulcanizing machines, on-site operators usually need to carry the corresponding wrenches and climb onto the upper lid to install or remove the connecting bolts used to connect the vulcanizing machine and the mold. This not only involves high labor intensity but also poses significant safety hazards.

[0003] Although existing molds and vulcanizing machine rapid devices use lightweight bottom-opening molds, they still suffer from problems such as complex structure, high failure rate, and high cost.

[0004] In view of the problems existing in the prior art, this utility model designs and manufactures a mold changing device to overcome the above-mentioned defects. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a mold changing device that can automatically achieve rapid connection and separation between the mold and the vulcanizing machine after the mold with the mold connecting plate is hoisted into the vulcanizing chamber, eliminating problems such as cumbersome mold installation and disassembly and high safety risks of working at height.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a mold changing device, including a mold connecting plate, wherein the mold connecting plate is connected to the mold;

[0007] A pot lid is provided above the mold connecting plate. Several quick-change devices are evenly distributed around the circumference of the pot lid. Each quick-change device includes a pull rod. The lower end of the pull rod is set as a T-shaped block. Several connecting holes are evenly distributed around the circumference of the pot lid corresponding to the pull rod. The pull rod extends through the connecting holes to the bottom of the pot lid.

[0008] The mold connecting plate is evenly distributed with several long slots around its circumference. Each T-shaped block of the quick-change device can cooperate with the corresponding long slot and extend into the bottom of the long slot.

[0009] Each of the pull rods is provided with a swing drive structure and a first lifting drive device at its upper end. The first lifting drive device drives the pull rod to rotate through the swing drive structure. Each pull rod is also connected to a second lifting drive device, which can drive the pull rod to move up and down.

[0010] Preferably, a cylinder seat is provided on the pot lid for each connecting hole, and the second lifting drive device includes a second cylinder, which is connected to the pot lid through the cylinder seat;

[0011] The cylinder rod end of the second cylinder is connected to a pressure cap, and the lower end of the pressure cap is connected to a pressure sleeve;

[0012] It also includes a compression spring flange, which has a through hole in the center and an annular groove on the side wall of the tie rod. The compression spring flange cooperates with the annular groove through the through hole.

[0013] The lower end of the pressure sleeve presses against the spring flange, and an elastic element is provided between the bottom of the spring flange and the pot lid. The elastic element causes the spring flange to drive the pull rod to move upward.

[0014] Preferably, the cylinder seat has a mounting cavity, and the pressure sleeve, spring flange and elastic element are all located in the mounting cavity.

[0015] Preferably, both the first lifting drive device and the swing drive structure are located inside the pressure sleeve;

[0016] The first lifting drive device includes a first hydraulic cylinder, which is connected to the bottom of the pressure plate. A guide sleeve is connected to the end of the cylinder rod of the first hydraulic cylinder, and the upper end of the pull rod is inserted into the guide sleeve and guided and cooperates with the lower end of the guide sleeve.

[0017] The swing drive structure includes a guide groove on the side wall of the guide sleeve and a guide pin on the outer side wall of the pull rod. The guide pin can guide and cooperate with the guide groove, which is a 1 / 4 turn spiral groove.

[0018] Preferably, a first limiting block is provided on the side wall of the guide sleeve or the side wall of the pressure sleeve, and a first axial guide groove is provided on the other side wall of the pressure sleeve or the side wall of the guide sleeve. The first limiting block and the first axial guide groove cooperate axially to restrict the rotation of the guide sleeve relative to the pressure sleeve.

[0019] A second limiting block is provided on the side wall of the pressure sleeve or the side wall of the cylinder seat, and a second axial guide groove is provided on the other side wall of the cylinder seat or the side wall of the pressure sleeve. The second limiting block and the second axial guide groove cooperate to axially guide and restrict the pressure sleeve from rotating relative to the cylinder seat.

[0020] Preferably, a heat insulation plate is provided between the oil cylinder seat and the pot lid.

[0021] Preferably, the lower end face of the compression spring flange is provided with an elastic element positioning groove, and one end of the elastic element is located in the elastic element positioning groove.

[0022] Preferably, a sealing device is provided between the pull rod and the communication hole of the pot lid;

[0023] The sealing device includes a sealing cap, a sealing ring groove is provided above the connecting hole, a sealing structure is provided in the sealing ring groove, and the sealing cap is connected to the pot lid to position the sealing structure in the sealing ring groove.

[0024] Preferably, the pot lid is also provided with a detection device, which can detect the distance between the pot lid and the mold connecting plate.

[0025] Preferably, a plurality of connecting blocks are evenly distributed around the upper surface of the mold connecting plate, and the elongated slot is disposed on the connecting blocks;

[0026] The bottom of the long slot is connected to a large-diameter hole, the diameter of which is greater than the length of the bottom of the T-block, and the T-block can enter the large-diameter hole through the long slot.

[0027] The advantages of this utility model are:

[0028] 1. This utility model first uses a second hydraulic cylinder to drive the pull rod to lift and lower. The T-shaped block at the lower end of the pull rod cooperates with the long slot and extends into the bottom of the long slot. Then, the linear motion of the hydraulic cylinder is converted into the rotational motion of the pull rod by the first hydraulic cylinder and the swing drive structure, which completes the locking of the T-shaped block and the long slot. This realizes the rapid and automatic connection and separation of the pot lid and the mold, eliminating the problems of cumbersome mold installation and disassembly and high safety risks of working at height in the traditional way.

[0029] 2. The swing drive structure of this utility model utilizes the cooperation of a spiral groove on the side wall of the guide sleeve (1 / 4 turn) and a guide pin on the side wall of the pull rod. When the second oil cylinder drives the guide sleeve to move down, the guide pin makes a spiral motion in the spiral groove, thereby driving the pull rod to rotate until it rotates 90°, so that the T-shaped block and the long slot hole are intersected, completing the locking of the T-shaped block and the long slot hole. When the pot lid is lifted again, it can drive the mold connecting plate to rise.

[0030] 3. This utility model uses a first limiting block and a first axial guide groove to restrict the rotation of the guide sleeve relative to the pressure sleeve, and uses a second limiting block and a second axial guide groove to restrict the rotation of the pressure sleeve relative to the cylinder seat, thereby ultimately ensuring the stability of the pull rod rotation.

[0031] 4. This utility model utilizes the through hole in the center of the compression spring flange and the annular groove on the tie rod to make the lifting and lowering of the compression spring flange drive the lifting and lowering of the tie rod without affecting the rotation of the tie rod. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a mold changing device located on a mold.

[0033] Figure 2 A top view of a mold changing device;

[0034] Figure 3 This is a top view of a mold connecting plate of a mold changing device;

[0035] Figure 4This is a partial schematic diagram of a mold changing device;

[0036] Figure 5 This is a cross-sectional view of the present invention AA;

[0037] Figure 6 This is a cross-sectional view of the present invention BB;

[0038] Figure 7 This is a schematic diagram of a mold changing device when the first oil cylinder in the pressure sleeve is not extended.

[0039] Figure 8 This is a top view of the T-shaped block of this utility model extending into the long slot hole;

[0040] Figure 9 This is a schematic diagram of the first hydraulic cylinder extending in the pressure sleeve of a mold changing device.

[0041] Figure 10 This is a top view of the T-shaped block and the long slot hole of this utility model when locked.

[0042] In the diagram: 1-Pot lid, 2-Quick change device, 3-Mold, 4-Mold connecting plate, 5-Connecting block, 6-Long slot, 7-Connecting hole, 8-Detection device, 9-Pull rod, 10-Second oil cylinder, 11-Oil cylinder seat, 12-Pressure sleeve, 13-Compression spring flange, 14-Butterfly spring, 15-Pressure cap, 16-Second limit block, 17-First oil cylinder, 18-Guide sleeve, 19-First limit block, 20-Sealing pressure cap, 21-Sealing structure, 22-Heat insulation plate, 23-Boss, 24-Guide groove, 25-Guide pin, 26-Annular groove, 91-T-block. Detailed Implementation

[0043] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0044] like Figures 1 to 10 As shown, a mold changing device includes a mold connecting plate 4, which is connected to a mold 3. A pot cover 1 is provided above the mold connecting plate 4. Several quick-change devices 2 are evenly distributed around the circumference of the pot cover 1, specifically in 4, 6, or 8 locations. The number of devices depends on the structural arrangement of the vulcanizing machine pot cover 1 and the weight of the mold 3. Each quick-change device 2 includes a pull rod 9, with a T-shaped block 91 at the lower end of the pull rod 9. Several connecting holes are evenly distributed around the circumference of the pot cover 1 corresponding to the pull rod 9. The pull rod 9 extends through the connecting holes to the bottom of the pot cover 1. Preferably, the mold connecting plate 4 has connecting holes 7 for molds 3 of different specifications, so that molds 3 of different specifications can be connected.

[0045] The mold connecting plate 4 has several long slots 6 evenly distributed around its circumference. Each T-shaped block 91 of the quick-change device 2 can cooperate with the corresponding long slot 6 and extend into the bottom of the long slot 6.

[0046] Each pull rod 9 is equipped with a swing drive structure and a first lifting drive device at its upper end. The first lifting drive device drives the pull rod 9 to rotate through the swing drive structure. Each pull rod 9 is also connected to a second lifting drive device, which can drive the pull rod 9 to move up and down. When the pull rod 9 swings under the drive of the first lifting drive device and the swing drive structure, the T-shaped block 91 will intersect with the long slot hole 6.

[0047] Specifically, the second lifting drive device is first used to drive the pull rod 9 to rise and fall. The T-shaped block 91 at the lower end of the pull rod 9 cooperates with the long slot 6 and extends into the bottom of the long slot 6. Then, the first lifting drive device and the swing drive structure are used to convert the linear motion of the lifting into the rotational motion of the pull rod 9, thereby completing the locking of the T-shaped block 91 and the long slot 6. This realizes the rapid and automatic connection and separation of the pot lid 1 and the mold 3, eliminating the problems of cumbersome installation and disassembly of the mold 3 and high safety risks of working at height in the traditional way.

[0048] To ensure sufficient stroke for the second lifting drive device, a cylinder seat 11 is provided on the pot lid 1 corresponding to each connecting hole position. The second lifting drive device includes a second cylinder 10, which is connected to the pot lid 1 via the cylinder seat 11. A pressure cap 15 is connected to the end of the cylinder rod of the second cylinder 10, and a pressure sleeve 12 is connected to the lower end of the pressure cap 15. It also includes a spring flange 13, which has a through hole in the center. An annular groove 26 is provided on the side wall of the pull rod 9. The spring flange 13 cooperates with the annular groove 26 through the through hole. By cooperating with the annular groove 26 on the pull rod 9 through the through hole in the center of the spring flange 13, the lifting of the spring flange 13 can drive the pull rod 9 to lift and lower without affecting the rotation of the pull rod 9.

[0049] The lower end of the pressure sleeve 12 presses against the spring flange 13. An elastic element is provided between the bottom of the spring flange 13 and the pot lid 1. The elastic element causes the spring flange 13 to drive the pull rod 9 to move upward. The second oil cylinder 10 drives the pressure sleeve 12 to descend, which will force the elastic element to compress through the spring flange 13. The T-shaped block 91 at the lower end of the pull rod 9 will enter the bottom of the long slot 6 through the long slot 6.

[0050] To ensure sufficient installation space for the compression spring flange 13, the elastic element, and the compression sleeve 12, the cylinder seat 11 is provided with an installation cavity, in which the compression sleeve 12, the compression spring flange 13, and the elastic element are all located.

[0051] The first lifting drive device and the swing drive structure of this utility model are both located inside the pressure sleeve 12. The first lifting drive device specifically includes a first oil cylinder 17, which is connected to the bottom of the pressure cover 15. The end of the oil cylinder rod of the first oil cylinder 17 is connected to a guide sleeve 18, and the upper end of the pull rod 9 is inserted into the guide sleeve 18 and guided and cooperated with the lower end of the guide sleeve 18.

[0052] The swing drive structure specifically includes a guide groove 24 located on the side wall of the guide sleeve 18 and a guide pin 25 located on the outer side wall of the pull rod 9. The guide pin 25 can guide and cooperate with the guide groove 24. The guide groove 24 is a 1 / 4 turn spiral groove. Preferably, two guide pins 25 are symmetrically arranged on the outer side of the pull rod 9, and the guide grooves 24 are correspondingly symmetrically arranged on the side wall of the guide sleeve 18. The height difference between the starting point and the ending point of the guide pin 25 is the stroke of the first hydraulic cylinder 17, ensuring that the first hydraulic cylinder 17 can drive the guide sleeve 18 to move from the starting point to the ending point of the spiral groove. At this time, the guide pin 25 is driven to rotate 90° along the spiral groove, that is, the pull rod 9 is driven to rotate 90°.

[0053] The swing drive structure of this utility model utilizes the spiral groove of 1 / 4 turn on the side wall of the guide sleeve 18 and the guide pin 25 on the side wall of the pull rod 9 to cooperate. When the second oil cylinder 10 drives the guide sleeve 18 to move down, the guide pin 25 makes spiral motion in the spiral groove, thereby driving the pull rod 9 to make rotational motion until the pull rod 9 rotates 90°, so that the T-shaped block 91 and the long slot hole 6 are intersected, completing the locking of the T-shaped block 91 and the long slot hole 6. When the pot lid 1 is lifted again, it can drive the mold connecting plate 4 to rise.

[0054] The present invention provides a first limiting block 19 on the side wall of the guide sleeve 18 or the side wall of the pressure sleeve 12, and a first axial guide groove on the side wall of the other pressure sleeve 12 or the side wall of the guide sleeve 18. The first limiting block 19 and the first axial guide groove axially guide and cooperate to restrict the rotation of the guide sleeve 18 relative to the pressure sleeve 12. The lower end of the guide sleeve 18 preferably has a boss 23 or an outward flange, and the first limiting block 19 or the first axial guide groove is provided on the boss 23 or the outward flange; the side wall of the pressure sleeve 12 (or...) A second limiting block 16 is provided on the side wall of the pressure cap 15 or the side wall of the cylinder seat 11. A second axial guide groove is provided on the side wall of the other cylinder seat 11 or the side wall of the pressure sleeve 12 (or the side wall of the pressure cap 15). The second limiting block 16 and the second axial guide groove cooperate to restrict the rotation of the pressure sleeve 12 relative to the cylinder seat 11. Through two-stage limiting, the guide sleeve 18 is restricted to rotate circumferentially relative to the cylinder seat 11. Of course, the guide sleeve 18 can also be directly restricted to rotate circumferentially relative to the cylinder seat 11 by the limiting block.

[0055] A heat insulation plate 22 is preferably provided between the oil cylinder seat 11 and the pot lid 1. Its function is to isolate the heat of the pot lid 1 from being transferred to the first oil cylinder 17 and the second oil cylinder 10, thereby reducing the temperature of the first oil cylinder 17 and the second oil cylinder 10 and extending their service life.

[0056] The lower end face of the compression spring flange 13 is preferably provided with an elastic element positioning groove, and one end of the elastic element is located in the elastic element positioning groove. The elastic element is preferably a plurality of butterfly springs 14. The butterfly springs 14 of this utility model can not only limit the downward movement of the pull rod 9, but also do not affect the rotation of the pull rod 9. When the cylinder rod of the second cylinder 10 extends, the pressure sleeve 12 can drive the compression spring flange 13 to move downward and simultaneously drive the pull rod 9 to move downward. When the cylinder rod of the second cylinder 10 retracts or the hydraulic pressure of the second cylinder 10 is removed, the butterfly springs 14 can drive the compression spring flange 13 to move upward and simultaneously drive the pull rod 9 to move upward.

[0057] In addition, the butterfly spring 14 of this utility model can also drive the compression flange 13 and the pull rod 9 to move upward, offset the gap between the mold connecting plate 4 and the pot lid 1, and apply the pre-tightening force between the pot lid 1, the pull rod 9 and the mold connecting plate 4, so that the lifting and lowering action of the pot lid 1 during the vulcanization process after the mold is locked will not affect the tight fit between the pull rod 9 and the mold connecting plate 4.

[0058] A sealing device is preferably provided between the pull rod 9 and the connecting hole of the pot lid 1. The sealing device can prevent the leakage of high temperature and high pressure gas in the steamer during the vulcanization process. The sealing device includes a sealing cap 20, a sealing ring groove is provided above the connecting hole, and a sealing structure 21 is provided in the sealing ring groove. The sealing cap 20 is connected to the pot lid 1 to position the sealing structure 21 in the sealing ring groove. At this time, the sealing cap 20 will be subjected to the pressure of the butterfly spring 14.

[0059] The pot lid 1 is also equipped with a detection device 8, which can detect the distance between the pot lid 1 and the mold connecting plate 4. It also includes a position detection sensor, which can detect the movement position of the pressure sleeve 12 and the guide sleeve 18. The controller can collect the signals fed back by the detection device 8 and the position detection sensor in order to control the action of the first oil cylinder 17 and the second oil cylinder 10.

[0060] The upper surface of the mold connecting plate 4 of this utility model preferably has several connecting blocks 5 evenly distributed around its circumference, and long slot holes 6 are set on the connecting blocks 5; the bottom of the long slot hole 6 is connected to a large diameter hole, the diameter of which is larger than the bottom length of the T-shaped block 91, so that the T-shaped block 91 can enter the large diameter hole through the long slot hole 6.

[0061] Preferably, a lifting guide positioning structure is provided between the pot lid 1 and the mold connecting plate 4. For example, a positioning ring can be provided on the mold connecting plate 4, and a positioning pin that cooperates with the positioning ring can be provided at the bottom of the pot lid 1, thereby improving the alignment of the pull rod 9 with the long slot hole 6 on the mold connecting plate 4.

[0062] Specific installation process of this utility model:

[0063] 1. First, connect the mold connecting plate 4 to the mold 3.

[0064] 2. Place mold 3 and mold connecting plate 4 onto the vulcanizing machine, and connect mold 3 to the vulcanizing machine base. Then drive pot lid 1 to move into the mold opening position above the vulcanizing machine. Pot lid 1 descends. During the descent, the relative position between mold connecting plate 4 and pot lid 1 is determined by the lifting guide positioning structure. Pull rod 9 corresponds one-to-one with the long slot 6 on mold connecting plate 4. When pot lid 1 contacts the upper end face of mold connecting plate 4, the detection device 8 is triggered. The controller receives the signal and controls pot lid 1 to stop descending.

[0065] 3. The second hydraulic cylinder 10 pushes out the cylinder rod, driving the pressure cap 15, pressure sleeve 12, pressure spring flange 13, and pull rod 9 to move downwards. The T-shaped end of the pull rod 9 extends into the corresponding long slot 6 of the mold connecting plate 4. After the position detection sensor detects that the second hydraulic cylinder 10 has been pushed out to the set position, it stops pushing out. At this time, the first hydraulic cylinder 17 is controlled to drive the guide sleeve 18 to move downwards. At this time, the guide pin 25 makes a spiral motion in the spiral groove, changing the linear motion into rotational motion, driving the pull rod 9 to rotate 90 degrees. The T-shaped block 91 at the lower end of the pull rod 9 locks with the long slot 6 of the mold connecting plate 4. Then the second hydraulic cylinder 10 starts to release the force. The pull rod 9 is driven upwards by the butterfly spring 14 until the gap between the pull rod 9 and the mold connecting plate 4 is eliminated and sufficient preload is maintained, completing the installation of mold 3.

[0066] Specific disassembly process of this utility model:

[0067] When removing mold 3 from the vulcanizing machine, first control the second hydraulic cylinder 10 to push the pressure cap 15, pressure sleeve 12, pressure spring flange 13, and pull rod 9 downward, so that the T-shaped block 91 at the lower end of the pull rod 9 is disengaged from the mold connecting plate 4. Then control the first hydraulic cylinder 17 to drive the guide sleeve 18 upward, causing the pull rod 9 to rotate 90 degrees. The second hydraulic cylinder 10 drives the pull rod 9 to rise, and the T-shaped block 91 is separated from the long slot 6. The detection device 8 detects the opening signal and feeds it back to the controller to confirm that the quick-change device 2 and the mold connecting plate 4 are open. Then control the lifting hydraulic cylinder of the pot cover 1 to drive the pot cover 1 to rise. After the pot cover 1 rises to the mold opening position, it is locked. The frame drives the pot cover 1 to move to the removal position. Finally, remove the bolts on the mold 3 and the vulcanizing machine base and lift the mold 3 out, completing the removal of mold 3.

[0068] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A mold changing device, characterized in that, Includes a mold connecting plate (4), which is connected to the mold (3); The mold connecting plate (4) is provided with a pot lid (1) above it. Several quick-change devices (2) are evenly distributed around the pot lid (1). The quick-change device (2) includes a pull rod (9). The lower end of the pull rod (9) is provided with a T-shaped block (91). Several connecting holes are evenly distributed around the pot lid (1) corresponding to the pull rod (9). The pull rod (9) extends through the connecting holes to the bottom of the pot lid (1). The mold connecting plate (4) has several long slots (6) evenly distributed around its circumference. Each T-shaped block (91) of the quick-change device (2) can cooperate with the corresponding long slot (6) and extend into the bottom of the long slot (6). Each of the pull rods (9) is provided with a swing drive structure and a first lifting drive device at its upper end. The first lifting drive device drives the pull rod (9) to rotate through the swing drive structure. Each of the pull rods (9) is also connected to a second lifting drive device, which can drive the pull rod (9) to move up and down. A cylinder seat (11) is provided on the pot lid (1) for each connecting hole. The second lifting drive device includes a second cylinder (10), which is connected to the pot lid (1) through the cylinder seat (11). The cylinder rod end of the second cylinder (10) is connected to a pressure cap (15), and the lower end of the pressure cap (15) is connected to a pressure sleeve (12). The cylinder seat (11) is provided with an installation cavity, and the pressure sleeve (12) is located in the installation cavity. The first lifting drive device and the swing drive structure are both located inside the pressure sleeve (12).

2. The mold changing device according to claim 1, characterized in that, It also includes a compression spring flange (13), which has a through hole in the center and an annular groove (26) on the side wall of the tie rod (9). The compression spring flange (13) is engaged with the annular groove (26) through the through hole. The lower end of the pressure sleeve (12) presses against the spring flange (13). An elastic element is provided between the bottom of the spring flange (13) and the pot lid (1). The elastic element causes the spring flange (13) to drive the pull rod (9) to move upward.

3. The mold changing device according to claim 2, characterized in that, The compression spring flange (13) and the elastic element are both located within the mounting cavity.

4. A mold changing device according to claim 2, characterized in that, The first lifting drive device includes a first hydraulic cylinder (17), which is connected to the bottom of the pressure cover (15). The end of the cylinder rod of the first hydraulic cylinder (17) is connected to a guide sleeve (18), and the upper end of the pull rod (9) is inserted into the guide sleeve (18) and guided and cooperated with the lower end of the guide sleeve (18). The swing drive structure includes a guide groove (24) on the side wall of the guide sleeve (18) and a guide pin (25) on the outer side wall of the pull rod (9). The guide pin (25) can guide and cooperate with the guide groove (24). The guide groove (24) is a 1 / 4 turn spiral groove.

5. A mold changing device according to claim 4, characterized in that, A first limiting block (19) is provided on the side wall of the guide sleeve (18) or the side wall of the pressure sleeve (12), and a first axial guide groove is provided on the side wall of the other pressure sleeve (12) or the side wall of the guide sleeve (18). The first limiting block (19) and the first axial guide groove cooperate to axially guide and restrict the rotation of the guide sleeve (18) relative to the pressure sleeve (12). A second limiting block (16) is provided on the side wall of the pressure sleeve (12) or the side wall of the cylinder seat (11), and a second axial guide groove is provided on the side wall of the other cylinder seat (11) or the side wall of the pressure sleeve (12). The second limiting block (16) and the second axial guide groove cooperate to axially guide and restrict the pressure sleeve (12) from rotating relative to the cylinder seat (11).

6. A mold changing device according to claim 2, characterized in that, A heat insulation plate (22) is provided between the oil cylinder seat (11) and the pot lid (1).

7. A mold changing device according to claim 2, characterized in that, The lower end face of the compression spring flange (13) is provided with an elastic element positioning groove, and one end of the elastic element is located in the elastic element positioning groove.

8. A mold changing device according to claim 2, characterized in that, A sealing device is provided between the connecting hole of the pull rod (9) and the pot lid (1); The sealing device includes a sealing cap (20), a sealing ring groove is provided above the connecting hole, and a sealing structure (21) is provided in the sealing ring groove. The sealing cap (20) is connected to the pot lid (1) to position the sealing structure (21) in the sealing ring groove.

9. A mold changing device according to claim 1, characterized in that, The pot lid (1) is also provided with a detection device (8), which can detect the distance between the pot lid (1) and the mold connecting plate (4).

10. A mold changing device according to claim 1, characterized in that, The mold connecting plate (4) has several connecting blocks (5) evenly distributed around its upper surface, and the long slot (6) is provided on the connecting block (5); The bottom of the long slot (6) is connected to a large-diameter hole, the diameter of which is greater than the bottom length of the T-block (91), and the T-block (91) can enter the large-diameter hole through the long slot (6).

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