O-ring forming mold

Abstract

The present application relates to an O-ring forming mold and to the technical field of sealing ring processing, which comprises an upper mold and a lower mold, one side of the upper mold being rotatably connected to one side of the lower mold via a hinge shaft, an upper mold core is fixedly provided on the side of the upper mold facing the lower mold, and a lower mold cavity is opened on the lower mold for rotatably inserting the upper mold core; a first handle is fixedly provided on the side of the upper mold away from the hinge shaft, and a second handle is fixedly provided on the side of the lower mold away from the hinge shaft, which is offset from the first handle, and the cross-sectional size of the first handle is larger than that of the second handle; in the present application, due to the offset arrangement of the first handle and the second handle, when the molding mold is used, the staff can directly hold the first handle on the upper mold, and then apply force to rotate the upper mold upward, so as to open the upper mold and the lower mold in a closed state, thereby reducing the time required to open the upper mold and improving the overall sealing ring processing efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of sealing ring processing, and in particular to an O-type sealing ring forming mold. Background Art

[0002] O-rings, a rubber sealing element with a circular cross section, have played an important role in the sealing application of mechanical design since their birth in the mid-19th century with their low cost, simple manufacturing process, excellent functional reliability and easy installation requirements. It was first introduced as a sealing solution for steam engine cylinders and is still the first choice in many sealing designs.

[0003] In the manufacturing process of O-rings, the design of the molding mold is crucial. A traditional O-ring molding mold consists of an upper mold and a lower mold, which are connected by a hinge on one side. The lower mold is carefully arranged with multiple lower mold cavities, and the upper mold is equipped with an upper mold core that precisely corresponds to these lower mold cavities. During the processing process, the lower mold is firmly placed on the ground, and then the upper mold is flipped up and opened, and the molten plastic is accurately injected into the lower mold cavity. After that, the upper mold is flipped down again, so that the upper mold core is tightly embedded in the corresponding lower mold cavity. After cooling and shaping, the upper mold is opened again, and the finished sealing ring can be easily taken out.

[0004] However, although this mold design meets the production needs in terms of function, it exposes certain inconveniences in actual operation. In particular, when the upper mold and the lower mold are closed, the upper handle fixed on them and the lower handle on the lower mold will be close to each other, and even overlap in projection at certain viewing angles; this design makes it difficult for workers to hold the upper handle alone to smoothly rotate the upper mold when trying to separate the closed molds, because the obstruction of the lower handle increases the difficulty of operation. This inconvenience not only prolongs the operation time, but may also have an adverse effect on the production efficiency of the sealing ring, and there is room for improvement. Summary of the invention

[0005] The purpose of the present application is to provide an O-ring forming mold to solve the problem that it is difficult to hold the upper handle alone to smoothly rotate the upper mold in the above-mentioned forming mold.

[0006] The present application provides an O-ring forming mold adopting the following technical solution:

[0007] An O-ring forming mold comprises an upper mold and a lower mold, one side of the upper mold is rotatably connected to one side of the lower mold via a hinge shaft, an upper mold core is fixedly arranged on the side of the upper mold facing the lower mold, and a lower mold cavity is opened on the lower mold for the upper mold core to be rotatably inserted into; a first handle is fixedly arranged on the side of the upper mold away from the hinge shaft, and a second handle is fixedly arranged on the side of the lower mold away from the hinge shaft, which is offset from the first handle, and the cross-sectional dimension of the first handle is greater than the cross-sectional dimension of the second handle.

[0008] By adopting the above technical solution, when the molding mold is used, since the first handle and the second handle are staggered, the staff can directly hold the first handle on the upper mold, and then apply force to rotate the upper mold upward, so as to open the upper mold and the lower mold in the closed state, thereby reducing the time required to open the upper mold and improving the overall sealing ring processing efficiency.

[0009] Optionally, a base plate is provided below the lower mold, the base plate is provided with a limiting groove for the lower part of the lower mold to be inserted into, a plurality of universal wheels are fixed on the side of the base plate away from the lower mold, and a traction handle is fixed on the upper edge of the base plate.

[0010] By adopting the above technical solution, when the molding mold is used, the lower mold is pre-installed in the limiting groove on the base plate; when the molding mold needs to be moved a short distance, due to the coordinated setting of the traction handle and the universal wheel, the base plate can be pulled by the traction handle, and then the mold placed on the base plate can be dragged to move; when the molding mold is in use, the staff can press down and lock the brake pad on the universal wheel to ensure the installation stability of the molding mold, and then the sealing ring can be processed and produced.

[0011] Optionally, the upper side surface of the base plate is symmetrically fixed with support rods located on both sides of the lower mold, and the base plate is provided with a cross beam whose two ends are fixedly connected to the upper ends of the support rods, and the cross beam is located above the upper mold; a traction motor arranged in a horizontal direction is fixedly provided on the side of the cross beam facing the upper mold, and a winding wheel is coaxially fixedly provided on the output shaft of the traction motor, and a pull rope is wound around the winding wheel, one end of the pull rope is fixedly connected to the outer periphery of the winding wheel, and the other end of the pull rope is detachably connected to the first handle.

[0012] By adopting the above technical solution, due to the coordinated arrangement of the traction motor, winding wheel and pull rope on the crossbeam, the traction motor is started to drive the winding wheel to rotate synchronously, and the pull rope is wound around the winding wheel, and then the pull rope provides an upward traction force to the upper mold, and finally the upper mold automatically opens upward; therefore, the upper mold can automatically open upward, and can also rotate downward and close by its own gravity, thereby improving the overall assembly efficiency of the sealing ring.

[0013] Optionally, two symmetrical connecting rods are provided on the two side edges of the beam away from the base plate, and one end of the connecting rods extends in a direction away from the traction handle; a protective curtain is provided above the base plate, one side edge of the protective curtain is detachably connected to the traction handle, and the other side is fixedly connected to the end of the connecting rod away from the beam.

[0014] By adopting the above technical solution, due to the coordinated arrangement of the connecting rod and the protective curtain, the protective curtain is supported by the end of the connecting rod and one side of the traction handle, and the protective curtain is installed above the molding mold for shielding, thereby reducing the possibility of impurities mixing in during the process of injecting molten plastic into the lower mold cavity, thereby improving the finished product quality of the sealing ring.

[0015] Optionally, a containing groove is provided on the traction handle, one side edge of the protective curtain is fixedly connected to the inner wall of the containing groove, a blocking groove is provided on the inner edge of the opening of the containing groove, and a blocking plate is provided on the side of the traction handle with one side hinged to the inner wall of the blocking groove, and the blocking plate can be rotatably inserted into the blocking groove.

[0016] By adopting the above technical solution, due to the setting of the accommodating trough and the sealing plate, when the protective curtain is needed to cover the top of the mold, the connection between the protective curtain and the end of the connecting rod is released, and then the sealing plate is rotated to open the opening of the accommodating trough, and then the protective curtain is stored in the accommodating trough, and finally the sealing plate is rotated into the sealing trough to seal the opening of the accommodating trough.

[0017] Optionally, a locking pin is fixedly provided on the side of the protective curtain away from the traction handle, and a locking through hole for inserting the locking pin is opened on the end of the connecting rod away from the cross beam.

[0018] By adopting the above technical solution, due to the matching setting of the locking pin and the locking through hole, when one side of the protective curtain is detachably connected to the end of the connecting rod, the locking pin on the protective curtain can be inserted into the locking through hole, thereby realizing the rapid disassembly and assembly of the protective curtain and the connecting rod.

[0019] Optionally, the end of the connecting rod close to the beam is rotatably connected to the upper side surface of the beam, and the rotating surface of the connecting rod is parallel to the upper side surface of the substrate; a plurality of fixing screw holes are provided on the upper side surface of the beam, and a fixing through hole that can overlap with the fixing screw hole is provided on the connecting rod, and a fixing screw that penetrates the fixing through hole and is screwed into the fixing screw hole is provided above the beam.

[0020] By adopting the above technical solution, the staff can adjust and fix the rotation angle of the connecting rod. When the connecting rod is rotated to a certain state, the fixing through hole coincides with the corresponding fixing screw hole, and then passes through the fixing through hole and is screwed into the corresponding fixing screw hole, thereby improving its assembly stability.

[0021] Optionally, an extension block is fixedly provided at the end of the connecting rod close to the cross beam, a positioning rod is slidably provided on the side surface of the support rod in the vertical direction and is located below the extension block, and a positioning through hole is provided on the base plate for the lower end of the positioning rod to pass through; the lower end of the positioning rod can abut against the ground when the bottom side of the extension block abuts against the upper end surface of the positioning rod.

[0022] By adopting the above technical solution, after the connecting rod is rotated to a state perpendicular to the length direction of the beam, due to the installation arrangement of the extension block and the positioning rod, this state makes the bottom side of the extension block abut against the upper end surface of the positioning rod. At this time, the lower end of the positioning rod can abut against the ground, thereby improving the installation stability of the molding mold in this state.

[0023] Optionally, a baffle is fixedly provided on the outer peripheral surface of the positioning rod, a return spring is fixedly provided on the lower side of the baffle, and a positioning groove is provided on the upper opening edge of the positioning through hole for the baffle to be inserted and slide, and the other end of the return spring is fixedly connected to the bottom side of the positioning groove.

[0024] By adopting the above technical solution, when the extension block is misaligned with the upper end of the positioning rod, due to the coordinated arrangement of the return compression spring and the baffle, the return spring squeezes the baffle, causing the positioning rod to move upward as a whole, and eventually a gap exists between the upper end of the positioning rod and the ground. This state is convenient for short-distance movement of the molding mold; when the bottom side of the extension block rotates to abut against the upper end face of the positioning rod, the extension block squeezes the upper end of the positioning rod, causing the return compression spring to be compressed, and the lower end of the positioning rod to abut against the ground.

[0025] Optionally, a guiding slope is provided on the edge of the upper end of the positioning rod.

[0026] By adopting the above technical solution, due to the setting of the guiding inclined surface, it is convenient for the bottom side of the extension block to rotate along the guiding inclined surface to a state of abutting against the upper end surface of the positioning rod.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. When the molding mold is used, the staff can directly hold the first handle on the upper mold, and then apply force to rotate the upper mold upward to open the closed upper mold and lower mold, thereby reducing the time required to open the upper mold and improving the overall sealing ring processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application;

[0031] Figure 2 This is a schematic structural diagram of the closed state of the upper mold and the lower mold in Example 1 of the present application;

[0032] Figure 3 It is a schematic diagram of the overall structure of Example 2 of the present application;

[0033] Figure 4 It is a cross-sectional structural schematic diagram of the mold installation and matching embodied in Example 2 of the present application;

[0034] Figure 5 This is a schematic diagram of the structure of the installation and coordination of the traction assembly according to the second embodiment of the present application;

[0035] Figure 6 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the protective curtain in Example 2 of the present application;

[0036] Figure 7 yes Figure 6 A magnified schematic diagram of part A;

[0037] Figure 8 yes Figure 6 A magnified schematic diagram of part B;

[0038] Fig. 9 It is a schematic diagram of the partial cross-sectional structure of the positioning rod installation cooperation embodied in Example 2 of the present application.

[0039] In the figure, 1, upper mold; 11, upper mold core; 12, hinge shaft; 13, first handle; 2, lower mold; 21, lower mold cavity; 22, second handle; 3, base plate; 31, universal wheel; 32, support rod; 33, crossbeam; 331, fixing screw hole; 34, connecting rod; 341, locking through hole; 342, hinge bolt; 343, fixing through hole; 344, extension block; 35, fixing screw; 36, positioning through hole; 361, positioning sink; 4, traction handle; 41, accommodating sink; 42, blocking sink; 43, blocking plate; 5, traction assembly; 51, traction motor; 52, winding wheel; 53, pull rope; 6, protective curtain; 61, locking pin; 7, positioning rod; 71, guiding slope; 72, baffle; 73, reset compression spring. DETAILED DESCRIPTION

[0040] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0041] Embodiment 1:

[0042] Reference Figure 1 and Figure 2, an O-ring forming mold, comprising an upper mold 1 and a lower mold 2, one side of the upper mold 1 is rotatably connected to one side of the lower mold 2 through a hinge shaft 12, a plurality of upper mold cores 11 are evenly fixed on the side of the upper mold 1 facing the lower mold 2, and a lower mold cavity 21 is opened on the lower mold 2 for the upper mold core 11 to be rotatably inserted;

[0043] A first handle 13 is fixedly provided on the side of the upper mold 1 away from the hinge shaft 12 by screws, and a second handle 22 offset from the first handle 13 is fixedly provided on the side of the lower mold 2 away from the hinge shaft 12 by screws. The cross-sectional dimension of the first handle 13 is larger than that of the second handle 22.

[0044] The implementation principle of the embodiment of the present application is:

[0045] When the staff needs to open the upper mold 1 and the lower mold 2 in a closed state, since the first handle 13 is larger than the second handle 22 and the first handle 13 and the second handle 22 are staggered, the staff can quickly hold the first handle 13 to rotate the upper mold 1.

[0046] Embodiment 2:

[0047] Reference Figure 3 and Figure 4 The difference between the embodiment of the present application and the embodiment is that a base plate 3 is provided under the lower mold 2, wherein the base plate 3 is provided with a limiting groove for the lower part of the lower mold 2 to be inserted into, and four universal wheels 31 with braking function are fixedly provided at the four corners on the side of the base plate 3 away from the lower mold 2, and a traction handle 4 is fixedly provided on the upper edge of the base plate 3.

[0048] When the molding mold needs to be moved a short distance, the base plate 3 can be pulled by the traction handle 4, thereby dragging the mold placed on the base plate 3 to move; when the molding mold is in use, the brake pads on the universal wheels 31 are pressed down and locked.

[0049] Reference Figure 4 and Figure 5 , the upper side of the base plate 3 is symmetrically fixed with support rods 32 located on both sides of the lower mold 2, and the base plate 3 is provided with a crossbeam 33 whose two ends are fixedly connected to the upper ends of the support rods 32, and the crossbeam 33 is located above the upper mold 1; a traction assembly 5 is provided below the crossbeam 33, wherein the traction assembly 5 includes a traction motor 51 fixedly arranged on the lower side of the crossbeam 33, and the traction motor 51 is arranged in the horizontal direction, and a winding wheel 52 is coaxially fixed on the output shaft of the traction motor 51, and a pull rope 53 is wound around the winding wheel 52, wherein one end of the pull rope 53 is fixedly connected to the outer periphery of the winding wheel 52, and the other end of the pull rope 53 is detachably connected to the first handle 13;

[0050] When the upper mold 1 needs to be rotated upward and opened, the traction motor 51 is started to drive the winding wheel 52 to rotate synchronously, and the pull rope 53 is wound around the winding wheel 52, and then the pull rope 53 provides an upward traction force to the upper mold 1, and finally the upper mold 1 is opened upward.

[0051] Reference Figure 4 and Figure 6 Two symmetrical connecting rods 34 are arranged on the two edges of the side of the cross beam 33 away from the base plate 3. When the connecting rods 34 are installed, one end of the two connecting rods 34 extends away from the traction handle 4. A protective curtain 6 made of a flexible material is arranged above the base plate 3.

[0052] When the protective curtain 6 is installed, one side edge of the protective curtain 6 is fixedly connected to the traction handle 4, and the other side is detachably connected to the end of the connecting rod 34 away from the cross beam 33; when the molding mold is used, the protective curtain 6 protects the top of the mold, thereby reducing the possibility of impurities mixing in during the injection of molten plastic into the lower mold cavity 21, thereby improving the finished product quality of the sealing ring.

[0053] Reference Figure 6 Two locking pins 61 are fixedly arranged on the side of the protective curtain 6 away from the traction handle 4, and a locking through hole 341 for inserting the locking pins 61 is opened on the end of the connecting rod 34 away from the crossbeam 33, so as to realize the detachable connection between the protective curtain 6 and the end of the connecting rod 34;

[0054] A receiving groove 41 is provided on the traction handle 4, one side edge of the protective curtain 6 is fixedly connected to the inner wall of the receiving groove 41, a blocking groove 42 is provided on the inner edge of the opening of the receiving groove 41, and a blocking plate 43 is provided on the side of the traction handle 4, one side of which is hinged to the inner wall of the blocking groove 42, and the blocking plate 43 can be rotatably inserted into the blocking groove 42;

[0055] When the protective curtain 6 is no longer needed to cover the top of the substrate 3, the staff can first pull out the locking pin 61 from the locking hole 341, then fold the protective curtain 6 into the accommodating groove 41, and finally close the sealing plate 43 to achieve the folding and storage of the protective curtain 6.

[0056] Reference Figure 5 , Figure 6 and Figure 7 The end of the connecting rod 34 close to the cross beam 33 is rotatably connected to the upper side of the cross beam 33 through a hinge bolt 342, wherein the rotation surface of the connecting rod 34 is parallel to the upper side of the base plate 3; four fixing screw holes 331 are evenly opened on the upper side of the cross beam 33 around the hinge bolt 342, and a fixing through hole 343 that can overlap with the fixing screw hole 331 is opened on the connecting rod 34, and a fixing screw 35 that penetrates the fixing through hole 343 and is screwed into the fixing screw hole 331 is provided above the cross beam 33, and the fixing screw 35 is a butterfly screw;

[0057] When the protective curtain 6 is no longer needed to block the top of the substrate 3, the connecting rod 34 can be rotated to a state parallel to the length direction of the beam 33 for storage; when the protective curtain 6 is needed to block the top of the substrate 3, the connecting rod 34 is rotated to a state perpendicular to the length direction of the beam 33, and then one side of the protective curtain 6 is fixed to the end of the connecting rod 34.

[0058] Reference Figure 5 and Figure 6 An extension block 344 is integrally formed on the end of the connecting rod 34 close to the cross beam 33, wherein the side surfaces of the two supporting rods 32 are slidably provided with a positioning rod 7 located below the extension block 344 in the vertical direction, and a positioning through hole 36 for the lower end of the positioning rod 7 to pass through is opened on the base plate 3;

[0059] After the connecting rod 34 rotates to a state perpendicular to the length direction of the beam 33, the bottom side of the extension block 344 abuts against the upper end surface of the positioning rod 7. At this time, the lower end of the positioning rod 7 can abut against the ground, thereby improving the installation stability of the molding mold in this state.

[0060] Reference Figure 6 , Figure 8 and Fig. 9 A guiding inclined surface 71 is provided on the edge of the upper end of the positioning rod 7, and two opposing baffles 72 are integrally formed on the outer circumference of the positioning rod 7, and a return spring 73 is fixedly provided on the lower side of the baffle 72. A positioning groove 361 for the baffle 72 to be inserted and slide is provided on the upper opening edge of the positioning through hole 36, and the other end of the return spring 73 is fixedly connected to the bottom side of the positioning groove 361;

[0061] When the bottom side of the extension block 344 rotates along the guide slope 71 to a state of abutting against the upper end surface of the positioning rod 7, the extension block 344 squeezes the upper end of the positioning rod 7, so that the return compression spring 73 is compressed and the lower end of the positioning rod 7 abuts against the ground; when the extension block 344 and the upper end of the positioning rod 7 are misaligned, the return spring squeezes the baffle 72, so that the positioning rod 7 moves upward as a whole, and finally a gap is created between the upper end of the positioning rod 7 and the ground. This state is convenient for short-distance movement of the molding mold.

[0062] The implementation principle of the embodiment of the present application is:

[0063] When the protective curtain 6 is needed to block the upper part of the substrate 3, the connecting rod 34 is rotated to a state perpendicular to the length direction of the crossbeam 33. At this time, the extension block 344 presses the upper end of the positioning rod 7 to compress the return compression spring 73, and the lower end of the positioning rod 7 abuts against the ground; then the locking pin 61 on one side of the protective curtain 6 is inserted into the locking through hole 341 on the connecting rod 34;

[0064] When the protective curtain 6 is no longer needed to block the top of the substrate 3, the locking pin 61 is first taken out from the locking through hole 341, and the protective curtain 6 is stored in the accommodating groove 41 on the traction handle 4, and then the connecting rod 34 is rotated to a state parallel to the length direction of the beam 33; in this state, the extension block 344 is misaligned with the upper end of the positioning rod 7, and the return spring squeezes the baffle 72, so that the positioning rod 7 moves upward as a whole, and finally a gap is created between the upper end of the positioning rod 7 and the ground. This state is convenient for short-distance movement of the molding mold.

[0065] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0066] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An O-ring molding die, comprising an upper die (1) and a lower die (2), one side of the upper die (1) being rotatably connected to one side of the lower die (2) via a hinge shaft (12), an upper die core (11) being fixedly arranged on the side of the upper die (1) facing the lower die (2), and a lower die cavity (21) for rotatably inserting the upper die core (11) being opened on the lower die (2); It is characterized in that A first handle (13) is fixedly provided on the side of the upper mold (1) away from the hinge shaft (12), and a second handle (22) offset from the first handle (13) is fixedly provided on the side of the lower mold (2) away from the hinge shaft (12), wherein the cross-sectional dimension of the first handle (13) is greater than the cross-sectional dimension of the second handle (22); A base plate (3) is provided below the lower mold (2), and a limiting recessed groove is provided on the base plate (3) for the lower part of the lower mold (2) to be inserted into. A plurality of universal wheels (31) are fixedly provided on the side of the base plate (3) away from the lower mold (2), and a traction handle (4) is fixedly provided on the upper edge of the base plate (3); support rods (32) located on both sides of the lower mold (2) are symmetrically fixedly provided on the upper side of the base plate (3), and a cross beam (33) is provided on the base plate (3) with two ends fixedly connected to the upper ends of the support rods (32), and the cross beam (33) is located above the upper mold (1); A traction motor (51) arranged in the horizontal direction is fixedly disposed on the side of the crossbeam (33) facing the upper mold (1); a winding wheel (52) is coaxially fixedly disposed on the output shaft of the traction motor (51); a pull rope (53) is wound around the winding wheel (52); one end of the pull rope (53) is fixedly connected to the outer periphery of the winding wheel (52); and the other end of the pull rope (53) is detachably connected to the first handle (13); Two symmetrical connecting rods (34) are arranged on the two edges of the side of the cross beam (33) away from the base plate (3), and one end of the connecting rod (34) extends in a direction away from the traction handle (4); a protective curtain (6) is arranged above the base plate (3), and one side edge of the protective curtain (6) is detachably connected to the traction handle (4), and the other side is fixedly connected to the end of the connecting rod (34) away from the cross beam (33); The end of the connecting rod (34) close to the cross beam (33) is rotatably connected to the upper side of the cross beam (33), and the rotation surface of the connecting rod (34) is parallel to the upper side of the base plate (3); a plurality of fixing screw holes (331) are provided on the upper side of the cross beam (33), and a fixing through hole (343) that can overlap with the fixing screw hole (331) is provided on the connecting rod (34), and a fixing screw (35) that penetrates the fixing through hole (343) and is screwed into the fixing screw hole (331) is provided above the cross beam (33); An extension block (344) is fixedly provided at the end of the connecting rod (34) close to the cross beam (33); a positioning rod (7) located below the extension block (344) is slidably provided on the side surface of the support rod (32) in the vertical direction; a positioning through hole (36) is provided on the base plate (3) for the lower end of the positioning rod (7) to pass through; the lower end of the positioning rod (7) can abut against the ground when the bottom side of the extension block (344) abuts against the upper end surface of the positioning rod (7); A baffle (72) is fixedly provided on the outer peripheral surface of the positioning rod (7), a return compression spring (73) is fixedly provided on the lower side of the baffle (72), a positioning recessed groove (361) for the baffle (72) to be inserted and slide is provided on the upper opening edge of the positioning through hole (36), and the other end of the return compression spring (73) is fixedly connected to the bottom side of the positioning recessed groove (361).

2. An O-ring forming mold according to claim 1, characterized in that: The traction handle (4) is provided with a receiving groove (41), one side edge of the protective curtain (6) is fixedly connected to the inner wall of the receiving groove (41), a blocking groove (42) is provided on the inner edge of the opening of the receiving groove (41), and a blocking plate (43) is provided on the side of the traction handle (4) with one side hinged to the inner wall of the blocking groove (42), and the blocking plate (43) can be rotatably inserted into the blocking groove (42).

3. The O-ring forming mold according to claim 1, characterized in that: A locking pin (61) is fixedly arranged on the side of the protective curtain (6) away from the traction handle (4), and a locking through hole (341) for inserting the locking pin (61) is provided on the end of the connecting rod (34) away from the cross beam (33).

4. The O-ring forming mold according to claim 1, characterized in that: A guiding inclined surface (71) is provided on the edge of the upper end of the positioning rod (7).

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