A rubber extruder head locking mechanism

Abstract

The invention provides a rubber extruder head locking mechanism, comprising an upper plate, a lower plate and a locking device for locking the upper plate and the lower plate, characterized in that the locking device comprises a pull screw, a locking clamping column, a locking disc, a steel ball and an elastic lifting device, the locking disc extends into a lower plate cylindrical hole in the middle of the lower plate, and the edge of the locking disc is fixedly connected with the lower plate. A stepped cylindrical hole is arranged in the middle of the locking disc, and an annular clamping groove is arranged on the outer wall of the locking clamping column arranged on the lower end of the pull screw installed on the upper plate. The elastic lifting device comprises a lifting disc and a lifting locking assembly, and the lifting disc is in sliding fit with the lower plate cylindrical hole. The lifting locking assembly is used for elastically pushing the lifting disc to rise to push the steel ball into the annular clamping groove, so that the locking disc is in close contact with the upper plate and is locked. The lifting disc is pushed down through air supply through the air inlet channel, the steel ball exits the annular clamping groove, and the locking between the upper plate and the lower plate is released. The structure is reasonable, the cost is low, the motion impact is small, the operation is convenient, the use is safe, the service life is long, and the application range is wide.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rubber processing machinery and equipment, in particular to a locking mechanism of a rubber extruder head. BACKGROUND

[0002] In order to continuously extrude rubber products with different cross-sectional shapes and sizes, whether it is a single rubber extruder or a multi-rubber extruder, a single head or a composite head for molding will be installed. Single rubber extruder is suitable for single rubber extrusion, and composite extruder is suitable for multi-rubber in-machine composite extrusion. In order to facilitate cleaning of the rubber in the head or / and easy processing of the head runner, the head is usually designed to be openable and closable. Therefore, after closing, the head structure design needs a corresponding locking mechanism to prevent the rubber in the head from separating the closed contact surface due to the pressure of the rubber during molding, so as to avoid the overflow of the rubber from the closed contact surface. Therefore, the closed contact surface is the locking surface. Generally, there are two types of single heads, integral and split. The locking surface of the former is the contact surface between the head flange and the cylinder flange, which is suitable for small-sized extruders, and the locking surface of the latter is the split surface between the upper head and the lower head, which is suitable for large-sized extruders. Composite heads are all split, with multiple split surfaces (the number of split surfaces is the same as the number of composite extruders). Since the rubber composite head is usually arranged in a back-riding manner, for the convenience of the following description, the upper and lower heads of each split surface in the rubber composite head are called upper head and lower head respectively.

[0003] The locking mechanism of the integral single head is generally C-type ring. It realizes the unlocking or locking between the head flange and the cylinder flange by opening and closing the two C-type rings arranged left and right or up and down (from the direction of the screw driving system towards the head), and then can open or close the head. The C-type ring mechanism arranged left and right realizes its opening and closing by rotating around a pin shaft fixed on the extruder cylinder or the extruder frame at its lower part. The driving force for opening and closing is generally manual force (such as Chinese patent No. ZL 201821057714.6). The two C-type ring mechanisms arranged up and down realize their opening and closing by moving away from or towards each other. The driving force for opening and closing is hydraulic force (such as Chinese patent No. CN2432034Y).

[0004] Split single head or composite head is generally locked by hydraulic system and special locking mechanism. Chinese patent (publication number: CN1788981A) provides a hammer head type rubber extrusion composite head locking mechanism; Chinese patent (publication number: CN201313389Y) provides an improved C-shaped door locking type rubber extrusion composite head locking mechanism based on reducing the size and weight of the door locking mechanism; Chinese patent (publication number: CN102173042A) provides a side locking type rubber extrusion composite head locking mechanism; Chinese patent (patent number: ZL201520731073.8) provides a rubber extrusion composite head locking mechanism with door locking and wedge-shaped block locking. The common shortcomings of the above-mentioned special locking mechanisms disclosed by the patents are complex structure, large size and heavy weight.

[0005] As known from the above, the manual head locking mechanism has low automation degree and high labor intensity; and the hydraulic head locking mechanism not only needs expensive hydraulic system and special locking mechanism, but also oil leakage is easy to cause fire. In addition, when the door is used in these composite head locking mechanisms, the door movement will produce a certain degree of impact, and since the locking is realized by the sliding movement of the wedge-shaped plane of the locking piece (C-shaped door or wedge-shaped block), high locking force is easy to cause sliding friction pair wear, which will reduce the service life of the head.

[0006] Therefore, it is urgent to develop a rubber extrusion head locking mechanism with simple structure, low cost, reliable locking, convenient and safe operation, no impact, long service life and wide application range, which is a technical problem to be solved in the field. SUMMARY

[0007] The present application provides a rubber extrusion head locking mechanism to solve the problems and deficiencies of the prior art, and solves the problems of complex structure, high cost, large movement impact, inconvenient operation, safety hazards, short service life and narrow application range of the prior art.

[0008] The purpose of the present application is achieved by the following technical solutions:

[0009] The locking mechanism of claim 1, wherein the locking mechanism comprises a first screw threaded hole, a second screw threaded hole, a third screw threaded hole, and a fourth screw threaded hole being inserted into the locking cam of the locking mechanism. The cam is secured to the bottom of the cylinder and is adapted to engage the cylinder when the cylinder is lowered, thereby enabling the cylinder to move relative to the top of the cylinder and engage with the cylinder when the cylinder is lowered.

[0010] Improvements to the above technical solution: a first dynamic sealing ring is installed between the cylindrical outer surface of the upper part of the lifting plate and the thick diameter of the lower part of the stepped cylindrical hole; a second dynamic sealing ring is installed between the circumferential outer surface of the lower part of the lifting plate and the cylindrical hole of the lower plate; a first static sealing ring is arranged between the downward protruding part of the bottom of the locking plate and the cylindrical hole of the lower plate, and a second static sealing ring is arranged between the locking plate at the peripheral part of the exhaust channel and the lower plate.

[0011] Further improvement of the above technical solution: a circular machining hole is opened on the bottom surface of the lower plate, the center of the circular machining hole and the cylindrical hole of the lower plate are on the same center line, and the diameter of the circular machining hole is larger than the cylindrical hole of the lower plate, the height of the circular machining hole is smaller than the cylindrical hole of the lower plate, and the circular machining hole is closed by a cover plate and fixed with a countersunk screw; the jacking locking assembly is installed between the jacking plate and the cover plate.

[0012] Further improvement of the above technical solution: the bottom surface of the jacking disc is provided with an annular groove, the jacking locking assembly comprises a jacking seat, a compression spring and a spring supporting seat, the jacking seat is arranged on the top surface of the cover plate, at least two cylindrical blind holes are arranged on the annular edge of the jacking seat, the centers of the cylindrical blind holes are the same distance from the center line, one spring supporting seat and one compression spring are arranged in each cylindrical blind hole, the upper end of each compression spring is located on the bottom surface of the annular groove of the jacking disc, the circumferential side surface of the lower part of the jacking seat is positioned and matched with the cylindrical hole of the lower plate, and a third static sealing ring is arranged between the circumferential side surface of the lower part of the jacking seat and the cylindrical hole of the lower plate; a circular ring is arranged on the top of the boss in the middle of the jacking seat, the outer side surface of the circular ring is in sliding fit with the inner side surface of the jacking disc cylindrical hole, and a third dynamic sealing ring is arranged between the outer side surface of the circular ring and the inner side surface of the jacking disc cylindrical hole.

[0013] Further improvement of the above technical solution: the inner cylinder of the jacking disc is an inner tapered surface, the lower part of the annular clamping groove of the locking clamping column is an outer tapered surface, the top surface of the thick diameter section of the lower part of the stepped cylindrical hole of the locking disc is in close contact with the steel ball, the steel ball is clamped from three surfaces, and the locking clamping column stably locks the upper plate and the lower plate together.

[0014] Further improvement of the above technical solution: the air inlet of the air inlet channel is arranged on the outer side wall of the locking disc, the air outlet of the air outlet channel is arranged on the lower plate, the air inlet is connected with the air outlet pipeline of the compressed air pump, and the air pressure output by the compressed air pump is sufficient to overcome the elastic force of the jacking locking assembly.

[0015] Further improvement of the above technical solution: the upper plate is the flange of the head of a rubber extruder or the edge part of the upper head, and the lower plate is the flange of the cylinder of the rubber extruder or the edge part of the lower head.

[0016] Compared with the prior art, the present application has the following advantages and positive effects:

[0017] 1. The present application is mechanically locked by spring force, which is stable and reliable, and is unlocked by air pressure, which is safe and convenient. The locking mechanism of the present application overcomes the defects of large size, heavy weight and high cost of conventional C-shaped door locking or wedge-shaped block type locking mechanism.

[0018] 2. The unique design of the locking mechanism of the present application has a wide application range, and is not only suitable for single head, but also suitable for composite head.

[0019] 3. The present application has the advantages of simple structure, reasonable design, convenient operation, safe use, overcoming the defect that the locking mechanism of the composite head will produce a certain degree of impact during locking door movement, and longer service life. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1is a sectional structure schematic view of the locking state of a rubber extruder head locking mechanism of the present application;

[0021] Figure 2 is Figure 1 A-A sectional view thereof;

[0022] Figure 3 is Figure 1 an enlarged schematic view at I in the figure;

[0023] Figure 4 is a sectional structure schematic view of the unlocking state of a rubber extruder head locking mechanism of the present application;

[0024] Figure 5 is Figure 4 an enlarged schematic view at II in the figure;

[0025] Figure 6 is a schematic view of the rubber extruder head locking mechanism of the present application used in a rubber extruder head;

[0026] Figure 7 is Figure 6 B-B sectional view thereof;

[0027] Figure 8 is Figure 7 an enlarged schematic view at III in the figure.

[0028] The reference signs in the figure are: 1, lower plate; 2, screw; 3, locking disc; 4, upper plate; 5, steel ball; 6, pull screw; 7, locking clamping column; 8, first dynamic sealing ring; 9, second static sealing ring; 10, second dynamic sealing ring; 11, third static sealing ring; 12, countersunk screw; 13, compression spring; 14, jacking seat; 15, third dynamic sealing ring; 16, cover plate; 17, spring support seat; 18, jacking disc; 19, first static sealing ring. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings:

[0030] Reference is made to Figures 1-8The embodiment of the rubber extruder head locking mechanism comprises an upper plate 4, a lower plate 1 and a locking device for locking the upper plate 4 and the lower plate 1, the locking device comprises a pull screw 6, a locking clamping column 7, a locking disc 3, a steel ball 5 and an elastic lifting device, a lower plate cylindrical hole is arranged in the middle of the lower plate 1, the bottom of the locking disc 3 protrudes into the upper part of the lower plate cylindrical hole, the edge of the locking disc 3 is fixedly connected with the lower plate 1 through a screw 2. The top surface of the locking disc 3 is used for tightly contacting or separating from the bottom surface of the upper plate 4, and a stepped cylindrical hole is arranged in the middle of the locking disc 3. A screw hole is arranged in the middle of the upper plate 4, the upper end of the pull screw 6 protrudes into the screw hole, the locking clamping column 7 is arranged in the stepped cylindrical hole and is connected with the lower end of the pull screw 6 exposed from the screw hole, an annular clamping groove is arranged on the outer side wall of the locking clamping column 7, and the steel ball 5 is arranged in the coarse diameter section of the lower part of the stepped cylindrical hole and the annular clamping groove. The elastic lifting device comprises a lifting disc 18 and a lifting locking assembly, the circumferential side surface of the lifting disc 18 is in sliding fit with the lower plate cylindrical hole, the middle of the lifting disc 18 is a lifting disc cylindrical hole, the top of the lifting disc 18 is a cylinder, the outer side surface of the cylinder is in sliding fit with the coarse diameter section of the lower part of the stepped cylindrical hole, and the steel ball 5 is located in the cylinder. The lifting locking assembly is used for elastically pushing the lifting disc 18 to ascend and push the steel ball 5 into the annular clamping groove, so that the top surface of the locking disc 3 is in close contact with the bottom surface of the upper plate 4 and is locked. An air inlet channel is arranged on the side wall of the locking disc 3, the inner end of the air inlet channel is communicated with a variable volume cavity formed by the locking disc 3, the lifting disc 18 and the lower plate 1, an air outlet channel is arranged on the side wall of the lower plate 1, and the air outlet channel is communicated with the air inlet channel. The variable volume cavity is inflated through the air inlet channel, so as to overcome the elastic force of the lifting locking assembly and push the lifting disc 18 to descend, so that the steel ball 5 is out of the annular clamping groove and the locking between the upper plate 4 and the lower plate 1 is released. In this way, the top surface of the locking disc 3 can be separated from the bottom surface of the upper plate 4 by manual or other mechanisms.

[0031] Further, the outer side surface of the cylinder of the upper part of the lifting disc 18 is provided with a first dynamic sealing ring 8 between the coarse diameter section of the lower part of the stepped cylindrical hole, the circumferential outer side surface of the lower part of the lifting disc 18 is provided with a second dynamic sealing ring 10 between the lower plate cylindrical hole, the first static sealing ring 19 is arranged between the bottom of the locking disc 3 and the lower plate cylindrical hole, and the second static sealing ring 9 is arranged between the locking disc 3 and the lower plate 1 at the peripheral part of the air outlet channel.

[0032] Further, a circular machining hole is arranged on the bottom surface of the lower plate 1, the center of the circular machining hole and the center of the lower plate cylindrical hole are on the same center line, the diameter of the circular machining hole is greater than that of the lower plate cylindrical hole, the height of the circular machining hole is less than that of the lower plate cylindrical hole, the circular machining hole is closed by a cover plate 16 and is fixed by a countersunk screw 12, and the lifting locking assembly is arranged between the lifting disc 18 and the cover plate 16.

[0033] Specifically, the bottom surface of the lifting disc 18 is provided with an annular groove, the lifting locking assembly comprises a lifting seat 14, a compression spring 13 and a spring support seat 17, the lifting seat 14 is arranged on the top surface of the cover plate 16, at least two cylindrical blind holes are arranged on the annular edge of the lifting seat 14, the centers of the cylindrical blind holes are the same distance from the center line, one spring support seat 17 and one compression spring 13 are placed in each cylindrical blind hole, the upper end of each compression spring 13 is on the bottom surface of the annular groove of the lifting disc 18. The circumferential side of the lower part of the lifting seat 14 is positioned and matched with the cylindrical hole of the lower plate, and the third static sealing ring 11 is installed between them; the top of the boss in the middle of the lifting seat 14 is provided with a ring, the outer side of the ring is in sliding fit with the inner side of the lifting disc cylindrical hole of the lifting disc 18, and the third dynamic sealing ring 15 is installed between them.

[0034] Further, the inner cylindrical upper part of the lifting disc 18 is an inner tapered surface, the lower part of the annular clamping groove of the locking clamping column 7 is an outer tapered surface, the top surface of the thick diameter section of the lower part of the stepped cylindrical hole of the locking disc 3 is in close contact with the steel ball 5, and the steel ball 5 is in close contact with the inner tapered surface of the cylinder of the lifting disc 18 and the outer tapered surface of the locking clamping column 7. From three sides, the steel ball 5 is clamped, so that the locking clamping column 7 stably locks the upper plate 4 and the lower plate 1 together.

[0035] Further, the air inlet of the air inlet channel is arranged on the outer side wall of the locking disc 3, the air outlet of the air outlet channel is arranged on the lower plate 1, the air inlet is connected with the air outlet pipeline of the compressed air pump, and the air pressure output by the compressed air pump is sufficient to overcome the elastic force of the lifting locking assembly.

[0036] As shown in Figure 6 , Figure 7 , the upper plate 4 is the flange of the head of the rubber extruder or the edge part of the upper head, and the lower plate 1 is the flange of the barrel of the rubber extruder or the edge part of the lower head. Three rubber extruder head locking mechanisms of the present application are arranged on the outer edges (or left and right edges) of a set of head flanges (or upper heads) and barrel flanges (or lower heads).

[0037] Specifically, see Figure 4A precisely processed lower plate cylindrical hole with a diameter of D2 is formed in the middle of the lower plate 1. A circular processing hole with a diameter of D1 is formed in the bottom of the lower plate 1 to facilitate processing of the lower plate cylindrical hole and assembly and disassembly of parts in the lower plate cylindrical hole. The inner diameter of the cylinder on the top of the jacking disc 18 is D4, and the outer diameter is D5. The bottom surface of the jacking disc 18 is provided with an annular groove, and the center line of the annular groove is circular with a diameter of D3. The spring support seat 17 is cylindrical with a diameter of D6. The top of the jacking seat 14 is provided with a circular ring, the inner wall of which has a diameter of D7, and the outer wall has a diameter of D4. The locking pin 7 mounted on the upper plate 4 has a maximum outer diameter of D8, and D8 < D7.

[0038] The working principle of the present application is as follows: under the action of the spring force (jacking force) of each group of compression springs 13, the jacking disc 18 is jacked upward until the upper inner tapered surface of the jacking disc 18, the lower outer tapered surface of the locking pin 7, and the upper bottom surface of the locking disc 3 are in close contact with the plurality of annularly arranged steel balls 5, achieving a locking state, i.e. the head is locked. When the jacking disc 18 is jacked upward, due to the sealing action of the first dynamic seal ring 8 and the second dynamic seal ring 10, the air in the variable volume cavity between the jacking disc 18 and the locking disc 3 is gradually compressed, and the air pressure increases. In order to smoothly lift the jacking disc 18, a special exhaust passage (not fully shown in the figure) is designed in the locking mechanism of the present application, which continuously discharges the compressed air in the variable volume cavity through the exhaust port (see Figure 1 、 Figure 4 ). When unlocking and opening the head, a certain pressure of compressed air is injected from the air inlet (see Figure 1 ) into the variable volume cavity between the jacking disc 18 and the locking disc 3. Under the action of the compressed air, the total spring force of the compression springs 13 is overcome, and the jacking disc 18 moves downward until it comes into contact with the jacking seat 14, and the steel balls 5 are in a free state, reaching the unlocked state (as shown in Figure 4 ). The upper plate 4 drives the locking pin 7 to move upward by artificial or other mechanisms, thereby achieving the operation of opening the head.

[0039] The following will be described in conjunction with the accompanying Figure 3 , the force analysis of the steel balls 5 in the locked state and the locking and unlocking principles are as follows:

[0040] From the force balance of a single steel ball 5 in the locked state, the relationship between the locking force and the jacking force generated by the compression springs 13 can be obtained. As shown in Figure 3 , when a single steel ball 5 is in force balance, the horizontal components of F1 and F2 are equal, and the sum of the vertical components of F1 and F2 is equal to F3, i.e. F1cosα = F2cosβ, F1sinα + F2sinβ = F3. Therefore,

[0041]

[0042] F1, F2 and F3 are the forces of the locking clamping column 7, the jacking disc 18 and the locking disc 3 on the steel ball 5 respectively, and angles a and β are the outer taper angle of the bottom of the locking clamping column 7 and the inner taper angle of the upper part of the jacking disc 18 respectively. In the present application, the values of a and β are 30°-40° and 4°-5° respectively. When a = 35° and β = 45° are substituted into formula (3), the following formula is obtained:

[0043]

[0044] In formulae (2), (3) and (4), if the sliding frictional resistance generated by the sealing ring around the jacking disc 18 during the jacking disc 18 rising process is ignored, F2sinβ is actually the jacking force required for compressing the spring 13 to lock a single steel ball 5; and F3 is the locking force generated by the single steel ball 5. For the convenience of explanation, it is assumed that the number of the compressing springs 13 is equal to that of the steel balls 5 (usually the number of the compressing springs 13 is less than that of the steel balls 5), and both are N, then the ratio of the total jacking force generated by each compressing spring 13 to the total locking force is:

[0045]

[0046] Formula (5) shows that the locking mechanism of the present application can generate a locking force 10 times the spring force. In other words, a large locking force can be generated by means of the small elastic force of the compressing spring 13, that is, the locking requiring a large locking force can be easily realized, and the gas pressure required for the gas pressure unlocking is not large, that is, the gas pressure unlocking can be easily realized. Moreover, the gas pressure source can be cut off at any time in the locking state, and the mechanical locking can be performed only by the spring force, and the locking is stable and reliable.

[0047] Let the rigidity coefficient of each group of compressing springs 13 in the locking state be k, and the compressing deformation be f, then Figure 1 and formula (5) can be known that the locking force provided by the locking mechanism of the present application is equal to

[0048] In addition, due to the tapered head of the locking clamping column 7 and the size of D8 < D7, the locking clamping column 7 can easily enter and exit the locking disc 3, that is, the entering and exiting of a large inclination angle can be realized.

[0049] Firstly, the application of the locking mechanism of the present application in the rubber extruder head is explained. Figure 6 and Figure 7 are the application schematic diagrams of the locking mechanism of the present application in the rubber extruder head. In the rubber extruder head, Figure 6 and Figure 7In the figure, the upper die and lower die respectively represent the die flange and barrel flange of an integral single die, or the upper die and lower die of a split single die, or the upper die and lower die of each parting surface in a composite die. The number of locking mechanisms m depends on the locking force F of the locking mechanism. c , the maximum pressure p of the rubber melt in the die runner and the runner projection area S perpendicular to the parting surface, that is:

[0050]

[0051] exist Figure 6 、 Figure 7 In the figure, six locking mechanisms are shown, with three locking mechanisms evenly arranged on the left and right sides of the machine head.

[0052] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention also fall within the scope of protection of the present invention.

Claims

1. A rubber extruder head locking mechanism, comprising an upper plate, a lower plate, and a locking device for locking the upper plate and the lower plate, characterized in that: The locking device includes a pull screw, a locking column, a locking disk, a steel ball and an elastic jacking device, a lower plate cylindrical hole is provided in the middle of the lower plate, the downward protruding part of the bottom of the locking disk extends into the upper part of the cylindrical hole of the lower plate, and the edge of the locking disk is fixedly connected to the lower plate by a screw, and the top surface of the locking disk is used to stick to or separate from the bottom surface of the upper plate, a stepped cylindrical hole is provided in the middle of the locking disk, and a screw hole is provided in the middle of the upper plate, the upper end of the pull screw extends into the screw hole, the locking column is provided in the stepped cylindrical hole, and is connected to the lower end of the pull screw exposed to the screw hole, and the outer wall of the locking column An annular groove is provided on the upper portion, and the steel ball is placed in the thick-diameter section at the lower part of the stepped cylindrical hole and the annular groove. The elastic jacking device includes a jacking plate and a jacking locking assembly. The circumferential side surface of the jacking plate forms a sliding fit with the cylindrical hole of the lower plate. The middle of the jacking plate is the jacking plate cylindrical hole, and the top of the jacking plate is a cylinder. The outer side surface of the cylinder forms a sliding fit with the thick-diameter section at the lower part of the stepped cylindrical hole, and the steel ball is located in the cylinder; the jacking locking assembly is used to elastically push the jacking plate to rise and push the steel ball into the annular groove, so that the top surface of the locking plate is in close contact with the bottom surface of the upper plate and locked. ; An air intake channel is provided on the side wall of the locking disk, and the inner end of the air intake channel is connected to the volume variable cavity formed by the locking disk, the lifting disk and the lower plate. An exhaust channel is provided on the side wall of the lower plate, and the exhaust channel is connected in the middle of the air intake channel. Air is inflated into the volume variable cavity through the air intake channel to overcome the elastic force of the lifting and locking assembly and push the lifting disk down, so that the steel ball exits the annular groove and releases the lock between the upper plate and the lower plate; an annular groove is provided on the bottom surface of the lifting disk, and the lifting and locking assembly includes a lifting seat, a compression spring and a spring support seat, and the lifting seat is provided on the top surface of the cover plate At least two cylindrical blind holes are provided on the annular edge of the jacking seat, and the centers of the cylindrical blind holes are at the same distance from the center line. A spring support seat and a compression spring are placed in each cylindrical blind hole, and the upper ends of the compression springs are pressed against the bottom surface of the annular groove of the jacking plate. The circumferential side surface of the lower part of the jacking seat is positioned and matched with the cylindrical hole of the lower plate, and a third static sealing ring is installed between the two. A circular ring is provided on the top of the boss in the middle of the jacking seat, and the outer side surface of the circular ring forms a sliding fit with the inner side surface of the cylindrical hole of the jacking plate of the jacking plate, and a third dynamic sealing ring is installed between the two.

2. The rubber extruder head locking mechanism according to claim 1, characterized in that A first dynamic sealing ring is installed between the cylindrical outer surface of the upper part of the lifting plate and the thick diameter of the lower part of the stepped cylindrical hole; a second dynamic sealing ring is installed between the circumferential outer surface of the lower part of the lifting plate and the cylindrical hole of the lower plate; a first static sealing ring is set between the downward protruding part of the bottom of the locking plate and the cylindrical hole of the lower plate, and a second static sealing ring is set between the locking plate at the peripheral part of the exhaust channel and the lower plate.

3. The rubber extruder head locking mechanism according to claim 1 or 2, characterized in that A circular machining hole is opened on the bottom surface of the lower plate, the centers of the circular machining hole and the cylindrical hole of the lower plate are on the same center line, and the diameter of the circular machining hole is larger than the cylindrical hole of the lower plate, and the height of the circular machining hole is smaller than the cylindrical hole of the lower plate. The circular machining hole is closed by a cover plate and fixed with a countersunk screw; the jacking locking assembly is installed between the jacking plate and the cover plate.

4. The rubber extruder head locking mechanism according to claim 1 or 2, characterized in that The upper inner part of the cylinder of the lifting plate is an inner conical surface, the lower part of the annular groove of the locking column is an outer conical surface, and the top surface of the thick-diameter section at the lower part of the stepped cylindrical hole of the locking plate is in close contact with the steel ball, clamping the steel ball from three sides, so that the locking column can stably lock the upper plate and the lower plate together.

5. The rubber extruder head locking mechanism according to claim 3, characterized in that The upper inner part of the cylinder of the lifting plate is an inner conical surface, the lower part of the annular groove of the locking column is an outer conical surface, and the top surface of the thick-diameter section at the lower part of the stepped cylindrical hole of the locking plate is in close contact with the steel ball, clamping the steel ball from three sides, so that the locking column can stably lock the upper plate and the lower plate together.

6. The rubber extruder head locking mechanism according to claim 1 or 2, characterized in that The air inlet of the air inlet channel is set on the outer wall of the locking plate, and the exhaust port of the exhaust channel is set on the lower plate. The air inlet is connected to the air outlet pipe of the compressed air pump. The air pressure output by the compressed air pump is sufficient to overcome the elastic force of the jacking locking assembly.

7. The rubber extruder head locking mechanism according to claim 5, characterized in that The air inlet of the air inlet channel is set on the outer wall of the locking plate, and the exhaust port of the exhaust channel is set on the lower plate. The air inlet is connected to the air outlet pipe of the compressed air pump. The air pressure output by the compressed air pump is sufficient to overcome the elastic force of the jacking locking assembly.

8. The rubber extruder head locking mechanism according to claim 1 or 2, characterized in that The upper plate is the head flange of the rubber extruder or the edge of the upper head, and the lower plate is the barrel flange of the rubber extruder or the edge of the lower head.

9. The rubber extruder head locking mechanism according to claim 7, characterized in that The upper plate is the head flange of the rubber extruder or the edge of the upper head, and the lower plate is the barrel flange of the rubber extruder or the edge of the lower head.

Images