A vulcanizing device for rubber transmission belt

Abstract

The present application discloses a vulcanization device for a rubber transmission belt, comprising an inner mold body, wherein the inner mold body comprises a plurality of mold bodies, and the plurality of mold bodies are stacked and arranged by an intermittent structure; when the transmission belt is lifted out and demoulded, the uppermost mold body is suitable for moving upward under the lifting force, and then the remaining mold bodies are driven by the intermittent structure to move upward in sequence until the inner mold body is completely separated from the molded transmission belt. The beneficial effects of the present application are as follows: by dividing the inner mold body into a plurality of mold bodies, and the plurality of mold bodies are stacked and formed by an intermittent structure, when the transmission belt and the inner mold body are subsequently lifted out and demoulded, the original integral demoulding is changed to the sequential demoulding of the plurality of mold bodies, thereby reducing the resistance during demoulding, making the demoulding process easier and not causing damage to the transmission belt. In addition, due to the simplification of the demoulding process, the power of the required lifting equipment is also reduced accordingly, thereby reducing the production cost.

Description

Technical Field

[0001] The present application relates to the technical field of transmission belt production equipment, and in particular to a vulcanization device for a rubber transmission belt. Background Art

[0002] A rubber V-belt is a conveyor belt with a V-shaped structure, which is mainly used in mechanical equipment that needs to transmit force. The raw materials of rubber V-belts generally include natural rubber, styrene-butadiene rubber or chloroprene rubber, as well as additives such as carbon black, sulfur, and zinc white powder. Rubber V-belts need to be vulcanized to improve the elasticity, strength, wear resistance, heat resistance, and aging resistance of the rubber. The vulcanization process directly affects the quality of the finished product of the V-belt.

[0003] In the prior art, such as Figure 1 As shown, the (transmission belt) mold needs to be placed in a vulcanizing tank, and then molded under a certain temperature and pressure, and cooled after vulcanization. Figure 2 As shown, the formed transmission belt is clamped by a clamping device, and then the inner mold inside the transmission belt is lifted out by a lifting device. However, in the process of lifting out and demoulding, there are such shortcomings: the inner mold is a cylindrical structure, and the contact area between it and the transmission belt is large, so the adhesion between the two is large, and it is not easy to demould. In addition, the transmission belt is easily deformed and damaged during the demoulding process, which affects the quality of the transmission belt. Therefore, a vulcanization device for a rubber transmission belt is proposed to solve the above problems. Summary of the invention

[0004] One of the purposes of the present application is to provide a vulcanization device for a rubber transmission belt.

[0005] In order to achieve the above purpose, the technical solution adopted in the present application is: a vulcanization device for a rubber transmission belt, including an inner mold body, the inner mold body including multiple mold bodies, and the multiple mold bodies are stacked and arranged through an intermittent structure; when the transmission belt is lifted out and demolded, the topmost mold body is suitable for moving up under the lifting force, and then the remaining mold bodies are moved up in turn driven by the intermittent structure until the inner mold body is completely separated from the molded transmission belt; the intermittent structure includes a traction rod, multiple intermittent blocks and multiple intermittent grooves, the traction rod is movably arranged in the inner mold body, the intermittent groove is arranged in the corresponding mold body, the intermittent block is arranged outside the traction rod and cooperates with the corresponding intermittent groove, and the heights of the multiple intermittent grooves increase from top to bottom.

[0006] Preferably, the intermittent groove includes a connected horizontal groove and a vertical groove; when the traction rod is rotated so that the intermittent block cooperates with the horizontal groove, the multiple stacked mold bodies are in a limited locking state; when the traction rod is reversed so that the intermittent block cooperates with the vertical groove, the multiple mold bodies are in an unlocked state.

[0007] Preferably, the traction rod and the inner mold body are matched through a clutch structure; when the traction rod moves, the clutch structure is in a separated state; when the rotation adjustment of the traction rod is completed, the clutch structure is in a limited state, so that the traction rod is suitable for remaining stationary.

[0008] Preferably, the clutch structure includes a clutch block and a pair of clutch grooves, the clutch block is horizontally elastically slidably installed in the inner mold body, and the clutch groove is arranged outside the traction rod; when the clutch structure is in a disengaged state, the clutch block is separated from the clutch groove; when the clutch structure is in a limited state, the clutch block cooperates with the clutch groove.

[0009] Preferably, a telescopic enclosure is provided inside the inner mold body near its side wall, an inner steam cavity is formed between the telescopic enclosure and the inner side wall of the inner mold body, and an air inlet hole connected to the inner steam cavity is provided outside the inner mold body.

[0010] Preferably, a telescopic enclosure is also provided inside the inner mold body near its axis, and the two telescopic enclosures are connected by a support member, thereby forming a closed support cavity between the two telescopic enclosures and the support member.

[0011] Preferably, a check valve communicating with the support cavity is disposed outside the inner mold body; the check valve is suitable for allowing expanded air in the support cavity to overflow.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] The present invention divides the inner mold body into multiple mold bodies, and the multiple mold bodies are stacked through an intermittent structure. When the transmission belt and the inner mold body are subsequently lifted out for demolding, the original integral demolding is changed to sequential demolding of multiple mold bodies, thereby reducing the resistance during demolding, making the demolding process easier and causing no damage to the transmission belt. In addition, due to the simplification of the demolding process, the power of the required lifting equipment is also reduced accordingly, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a conventional vulcanizing device for forming a transmission belt.

[0015] Figure 2 Schematic diagram of the existing transmission belt being lifted out of the mold.

[0016] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the inner mold body of the present invention.

[0018] Figure 5 It is a schematic diagram of the cross-sectional structure of the inner mold body of the present invention.

[0019] Figure 6 It is a schematic diagram of the enlarged structure of points A and B of the present invention.

[0020] Figure 7 It is a schematic diagram of the enlarged structure of point C of the present invention.

[0021] Figure 8 It is a schematic diagram of the specific structure of the intermittent tank of the present invention.

[0022] Fig. 9 It is a schematic diagram of the traction rod structure of the present invention.

[0023] Fig.10 It is a schematic diagram of the inner mold body and the transmission belt being lifted out of the mold according to the present invention.

[0024] In the figure: a, vulcanizing tank; b, external pressure chamber; c, air storage chamber; d, external air inlet pipe; e, internal air inlet pipe; f, air inlet groove; g, support plate; h, inner mold frame; i, belt blank; j, rubber sleeve; 1, transmission belt; 2, inner mold body; 201, mold body; 202, telescopic enclosure; 203, steam chamber; 204, air inlet hole; 205, support chamber; 206, check valve; 3, intermittent structure; 301, traction rod; 302, intermittent block; 303, intermittent groove; 3031, horizontal groove; 3032, vertical groove; 4, clutch structure; 401, clutch block; 402, clutch groove. DETAILED DESCRIPTION

[0025] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] In the prior art, Figure 1 As shown, the forming principle of the transmission belt 1 is as follows: first, a belt blank i (transmission belt 1 blank) is sleeved on the outside of the inner mold frame h, and then a rubber sleeve j is sleeved on the outside of the belt blank i. Of course, a tooth profile is provided on the inner side of the rubber sleeve j. The upper and lower ends of the rubber sleeve j are installed and sealed by cover plates, and finally installed on the support plate g in the vulcanization tank a; the vulcanization process is carried out: that is, steam is introduced into the external pressure chamber b through the external air inlet pipe d, and steam is introduced into the air storage chamber c through the internal air inlet pipe e. The steam in the air storage chamber c enters the inner mold frame h through the air inlet groove f on the support plate g. In this way, external pressure is formed on the outside of the rubber sleeve j, and internal pressure is formed on the inside of the rubber sleeve j. There is a certain pressure difference between the two. Then, the rubber belt blank i forms a tooth profile due to viscosity flow under high temperature and pressure, and a cross-linking reaction occurs to complete vulcanization, thereby forming the transmission belt 1.

[0029] In the subsequent lifting and demoulding process, Figure 2 As shown, the transmission belt 1 outside the inner mold frame h needs to be clamped and fixed by a clamping assembly, and then the inner mold frame h is lifted upward by a lifting device to achieve demolding between the transmission belt 1 and the inner mold frame h. We know that the transmission belt 1 is an integral structure before being cut, so the corresponding inner mold frame h is a cylindrical structure as a whole, and the contact area between the inner mold frame h and the transmission belt 1 is large, and the adhesion between the two is large, which is not easy to demold, that is, the lifting device needs to have a large power, and the transmission belt 1 is easily deformed and damaged during the demolding process, which affects the quality of the transmission belt 1.

[0030] Therefore, the inventor of the present application improved the existing inner mold frame h and developed a vulcanization device for a rubber transmission belt, one embodiment of which is as follows: Figures 1 to 10As shown, it includes an inner mold body 2, and the inner mold body 2 includes a plurality of mold bodies 201, and the plurality of mold bodies 201 are stacked (up and down) through intermittent structures 3, that is, the inner mold body 2 is divided into a plurality of mold bodies 201 from top to bottom.

[0031] Therefore, when the inner mold body 2 inside the transmission belt 1 is lifted out and demolded, the uppermost mold body 201 can be moved upward under the action of the lifting force, and then demolded from the transmission belt 1, while the remaining mold bodies 201 remain stationary. Subsequently, the second mold body 201 will also be moved upward under the action of the intermittent structure 3 and demolded from the transmission belt 1, while the remaining mold bodies 201 also remain stationary. This is repeated, and the mold bodies 201 will be moved upward one by one under the action of the intermittent structure 3 and demolded from the transmission belt 1 until the inner mold body 2 is completely separated from the molded transmission belt 1.

[0032] It can be seen that the original inner mold body 2 is demoulded in an integrated manner, while the present application divides the inner mold body 2 into multiple mold bodies 201, and then demoulds them one by one under the action of the intermittent structure 3, and the contact area between a single mold body 201 and the transmission belt 1 is greatly reduced relative to the contact area between the entire inner mold body 2 and the transmission belt 1, thereby reducing the resistance during demoulding, making the demoulding process easier and not causing damage to the transmission belt 1. In addition, due to the simplification of the demoulding process, the power of the required lifting equipment is also reduced accordingly, thereby reducing the production cost.

[0033] The present application does not limit the specific structure of the intermittent structure 3, including but not limited to the following two structures:

[0034] Structure 1: Figure 5 and Figure 6 As shown, the intermittent structure 3 includes a traction rod 301, a plurality of intermittent blocks 302 and a plurality of intermittent grooves 303. The traction rod 301 is movably arranged in the inner mold body 2, the intermittent grooves 303 are arranged in the corresponding mold body 201, the intermittent blocks 302 are arranged outside the traction rod 301 and cooperate with the corresponding intermittent grooves 303, and the heights of the plurality of intermittent grooves 303 increase from top to bottom.

[0035] Specific as Figure 5 As shown, here we assume that the number of motifs 201 is six for illustration, and they are a1, a2, a3, a4, a5 and a6 from top to bottom; Figure 6 As shown, the height of the intermittent groove 303 in a1 is d1, the height of the intermittent groove 303 in a2 is d2, and so on. The heights of the intermittent grooves 303 in a3, a4, a5 and a6 are d3, d4, d5 and d6 respectively, and the heights from d1 to d6 increase successively.

[0036] Assume that in the initial state (i.e., the un-demolded state): multiple mold bodies 201 are stacked and attached to each other, and the intermittent blocks 302 and the bottom ends of the intermittent grooves 303 are matched. When demolding, the top mold body 201 (a1) will move upward under the action of the lifting force, and then the traction rod 301 will move upward accordingly. In the initial stage of the upward movement, the remaining mold bodies 201 (a2 to a6) will remain stationary, that is, a1 will be demolded with the transmission belt 1 first. After the traction rod 301 continues to move upward, among a2 to a6, since the height of the intermittent groove 303 in a2 is the smallest, the corresponding intermittent block 302 on the traction rod 301 will first be matched with the top of the intermittent groove 303 in a2, so the second mold body 201 (a2) will move upward under the drive of the traction rod 301 and be demolded with the transmission belt 1, while the remaining mold bodies 201 (a3 to a6) will remain stationary. This process is repeated, and a3, a4, a5 and a6 are demoulded from the transmission belt 1 in sequence under the action of the traction rod 301, thereby realizing the sequential demoulding process of the entire inner mold body 2.

[0037] When applying the above embodiment, the following problem may exist: the fitting and stacking arrangement of the multiple mold bodies 201 relies on the effect of gravity, which makes the stability of the connection between the mold bodies 201 insufficient, and when the belt blank i is sleeved, the friction between the multiple mold bodies 201 and the belt blank i can easily cause gaps to appear between them, thereby affecting the subsequent vulcanization molding process.

[0038] Therefore, in order to solve the above technical problems, in one embodiment of the present application, Figure 8 As shown, the intermittent groove 303 includes a horizontal groove 3031 and a vertical groove 3032 that are connected.

[0039] It is understandable that, in the initial state: assuming that the intermittent block 302 and the horizontal groove 3031 cooperate, since the horizontal groove 3031 limits the upper and lower positions of the intermittent block 302, the multiple stacked mold bodies 201 will be in a limited locking state at this time, so as to facilitate the vulcanization molding process of the rubber transmission belt 1. In the subsequent demoulding process, it is necessary to release the locking limit of the multiple mold bodies 201. At this time, the traction rod 301 is rotated so that the intermittent block 302 rotates from the horizontal groove 3031 and cooperates with the vertical groove 3032, so that the multiple mold bodies 201 can be in an unlocked state, which is convenient for the subsequent lifting and demoulding process.

[0040] In one embodiment of the present application, since the traction rod 301 is movably arranged, and the locking and unlocking states of the plurality of mold bodies 201 are achieved by the rotation of the traction rod 301, it is very important that the traction rod 301 maintains the position after the rotation. Figure 6 and Figure 7As shown, the traction rod 301 and the inner mold body 2 can be matched through a clutch structure 4.

[0041] It is understandable that when the traction rod 301 is rotated and adjusted, the clutch structure 4 will be in a limited state, thereby enabling the traction rod 301 to remain in a static state. When the traction rod 301 needs to move, the force acting on the traction rod 301 will be greater than the limiting force of the clutch structure 4, thereby enabling the clutch structure 4 to be in a separated state, so that the traction rod 301 can move.

[0042] As a further description of the above embodiment: Figure 7 and Fig. 9 As shown, the clutch structure 4 includes a clutch block 401 and a pair of clutch slots 402 . The clutch block 401 is horizontally elastically slidably installed in the inner mold body 2 (eg a1 ) (through a spring), and the clutch slots 402 are arranged outside the traction rod 301 .

[0043] Specifically, the clutch block 401 may be spherical, and the clutch slot 402 may be hemispherical; when the clutch block 401 cooperates with the clutch slot 402 under the action of elastic force, the clutch structure 4 is in a limited position, thereby keeping the traction rod 301 stationary. When the traction rod 301 rotates under the action of external force, the clutch block 401 will be forced to slide under the action of the external force and separate from the clutch slot 402, thereby making the clutch structure 4 in a separated state.

[0044] It is understandable that when the clutch structure 4 is in the limited state, assuming that the clutch block 401 cooperates with one of the clutch grooves 402, this corresponds to the initial state, that is, the intermittent block 302 cooperates with the horizontal groove 3031, so under the action of the clutch structure 4, the inner mold body 2 can stably maintain the initial state. Similarly, assuming that the clutch block 401 cooperates with another clutch groove 402, the intermittent block 302 cooperates with the vertical groove 3032, so that the unlocked state of the inner mold body 2 can be stably maintained, thereby facilitating the subsequent lifting and demoulding process.

[0045] Structure 2 (not shown): The intermittent structure 3 includes a slider and a slide groove, and adjacent mold bodies 201 are connected by the sliding cooperation of the slider and the slide groove. That is, adjacent mold bodies 201 are connected by sliding, and in the initial state, multiple mold bodies 201 are attached and stacked together under the action of gravity; and when demolding, multiple mold bodies 201 will slide relative to each other and demold in sequence, thereby achieving a smooth demolding process of the entire inner mold body 2.

[0046] In order to further improve the stability and reliability of the inner mold body 2 in the initial state, a limiting bolt is provided through the inner mold body 2, and the tail section of the limiting screw and the lowermost mold body 201 are matched through threads.

[0047] Specifically, we can tighten the limiting screw so that the limiting screw and the bottom mold body 201 are threadedly engaged, and the head (screw head) of the limiting screw will abut against the top mold body 201. By limiting and fixing the mold body 201 at one end and the other, the multiple stacked mold bodies 201 can be placed in a limited locking state. Similarly, when we loosen the limiting screw so that the tail section of the limiting screw is separated from the bottom mold body 201, the multiple mold bodies 201 will be in an unlocked state, which is convenient for the subsequent demoulding process.

[0048] It should be noted that, for structure one, the unlocking and locking process of the inner mold body 2 is relatively simple, and it only needs to be rotated to a set angle, and this angle must be less than 360 degrees; and in the locked state, each mold body 201 can be locked through its own intermittent block 302 and horizontal groove 3031, and the stability is good. For structure two, the unlocking and locking process of the inner mold body 2 is relatively cumbersome, that is, it is necessary to rotate the limit screw a set number of times; and frequent disassembly can easily cause the thread to be damaged, but its structure is simple and the manufacturing cost is low. Therefore, both structures can meet actual needs, and technicians in this field can choose according to actual conditions.

[0049] In one of the embodiments of the present application, Figure 5 As shown, a telescopic enclosure 202 is provided inside the inner mold body 2 near its side wall, an inner steam cavity 203 is formed between the telescopic enclosure 202 and the inner side wall of the inner mold body 2, and an air inlet 204 connected to the inner steam cavity 203 is provided outside the inner mold body 2.

[0050] Specifically, the telescopic panel 202 is in a circular shape, the top of the telescopic panel 202 is connected to the uppermost mold body 201, the bottom of the telescopic panel 202 is connected to the lowermost mold body 201, and an inner steam cavity 203 is formed between the telescopic panel 202 and the inner side wall of the inner mold body 2. In the prior art, the inner cavity of the entire inner mold body 2 is filled with steam, while in the present application, the part close to the side of the inner mold body 2 is set as the steam cavity 203, which can greatly reduce the amount of steam used and improve the utilization efficiency of steam. During the vulcanization molding process, steam is injected into the inner steam cavity 203 through the air inlet 204, and the steam is evenly distributed in the inner steam cavity 203, so that the side walls of the mold body 201 can be fully heated to ensure the vulcanization quality of the rubber transmission belt 1.

[0051] It should be noted that the telescopic enclosure 202 can be telescopically adjusted as the name suggests, and its purpose is to prevent interference in the mutual demoulding of the multiple mold bodies 201.

[0052] Furthermore, in order to enhance the structural stability of the inner mold body 2, as Figure 5 As shown, a telescopic enclosure 202 is also provided inside the inner mold body 2 near its axis, and the two telescopic enclosures 202 are connected by a support member, thereby forming a support cavity 205 between the two telescopic enclosures 202 and the support member, thereby further improving the overall rigidity and stability of the inner mold body 2; of course, the support cavity 205 should also be configured to be closed to prevent steam from entering.

[0053] In the actual vulcanization process, although the closed support cavity 205 can prevent the entry of steam, the air inside it will expand due to heat, which may damage the inner mold body 2. Therefore, a check valve 206 connected to the support cavity 205 can be provided on the outside of the inner mold body 2 (i.e., on the uppermost and lowermost mold bodies 201); the check valve 206 can allow the expanded air in the support cavity 205 to overflow, and can also prevent steam from entering, thereby ensuring the stable progress of the vulcanization process.

[0054] The working principle of the present invention is:

[0055] We take intermittent structure 3 as structure 1 as an example to illustrate. Fig. 9 As shown, a hexagonal socket may be provided at the top end of the traction rod 301 .

[0056] After the transmission belt 1 is vulcanized and formed, when the transmission belt 1 needs to be separated from the inner mold body 2, as shown in FIG. Figure 5 As shown, for the inner mold body 2, the multiple mold bodies 201 are in a locked limit state. At this time, we can insert the hexagonal wrench into the hexagonal slot at the top of the traction rod 301, rotate the traction rod 301, and then make the intermittent block 302 rotate from the horizontal slot 3031 and cooperate with the vertical slot 3032, so that the multiple mold bodies 201 can be in an unlocked state. Of course, in order to improve stability, the intermittent structure 3 can be provided with multiple groups, for example, four groups, which are equidistantly distributed along the circumference of the inner mold body 2, and at this time, the four traction rods 301 need to be rotated and unlocked in sequence.

[0057] Finally, the demoulding process is carried out: Fig.10As shown, the inner mold body 2 is placed on a workbench, and the transmission belt 1 outside the inner mold body 2 is clamped and fixed by the clamping mechanism on the workbench, and then the uppermost mold body 201 of the inner mold body 2 is connected to the lifting device, so that the uppermost mold body 201 (a1) will move up under the action of the lifting force, and in the initial stage of the upward movement, the remaining mold bodies 201 (a2 to a6) will remain stationary, that is, at this time, a1 will be demoulded from the transmission belt 1 first. After the traction rod 301 continues to move up, from a2 to a6, since the intermittent groove 303 in a2 has the smallest height, the corresponding intermittent block 302 on the traction rod 301 will first be against the top of the intermittent groove 303 in a2, so the second mold body 201 (a2) will move up and demould from the transmission belt 1 under the drive of the traction rod 301, while the remaining mold bodies 201 (a3 to a6) will remain stationary. This process is repeated, and a3, a4, a5 and a6 are demoulded from the transmission belt 1 in sequence under the action of the traction rod 301, thereby realizing the sequential demoulding process of the entire inner mold body 2.

[0058] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A vulcanizing device for a rubber transmission belt, characterized in that: The inner mold body comprises a plurality of mold bodies, and the plurality of mold bodies are stacked and arranged through an intermittent structure; when the transmission belt is lifted out and demoulded, the uppermost mold body is suitable for moving upward under the lifting force, and then the remaining mold bodies are driven by the intermittent structure to move upward in sequence until the inner mold body is completely separated from the molded transmission belt; The intermittent structure includes a traction rod, a plurality of intermittent blocks and a plurality of intermittent grooves, wherein the traction rod is movably arranged in the inner mold body, the intermittent grooves are arranged in the corresponding mold body, the intermittent blocks are arranged outside the traction rod and cooperate with the corresponding intermittent grooves, and the heights of the plurality of intermittent grooves are increased from top to bottom; The intermittent groove includes a connected horizontal groove and a vertical groove; when the traction rod is rotated to make the intermittent block cooperate with the horizontal groove, the multiple stacked mold bodies are in a limited locking state; when the traction rod is reversed to make the intermittent block cooperate with the vertical groove, the multiple mold bodies are in an unlocked state.

2. The vulcanizing device for a rubber transmission belt according to claim 1, characterized in that: The traction rod and the inner mold body are matched through a clutch structure; when the traction rod moves, the clutch structure is in a separated state; when the rotation adjustment of the traction rod is completed, the clutch structure is in a limited state, so that the traction rod is suitable for keeping still.

3. The vulcanizing device for a rubber transmission belt according to claim 2, characterized in that: The clutch structure includes a clutch block and a pair of clutch grooves, wherein the clutch block is horizontally elastically slidably installed in the inner mold body, and the clutch groove is arranged outside the traction rod; when the clutch structure is in a disengaged state, the clutch block is separated from the clutch groove; when the clutch structure is in a limited state, the clutch block cooperates with the clutch groove.

4. The vulcanizing device for a rubber transmission belt according to claim 1, characterized in that: A telescopic enclosure is arranged inside the inner mold body near its side wall, an inner steam cavity is formed between the telescopic enclosure and the inner side wall of the inner mold body, and an air inlet hole connected to the inner steam cavity is arranged outside the inner mold body.

5. The vulcanizing device for rubber transmission belt according to claim 4, characterized in that: A telescopic enclosure is also provided inside the inner mold body near its axis, and the two telescopic enclosures are connected by a support member, thereby forming a closed support cavity between the two telescopic enclosures and the support member.

6. The vulcanizing device for a rubber transmission belt according to claim 5, characterized in that: A check valve communicating with the support cavity is disposed outside the inner mold body; the check valve is suitable for allowing expanded air in the support cavity to overflow.

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