A mechanical seal structure for horizontal high-pressure polymerization kettle

Abstract

The present application relates to the technical field of polymerization kettles, and discloses a mechanical sealing structure for a horizontal high-pressure polymerization kettle, including a sealing device arranged on a kettle body, a rotating shaft rotatably connected inside the kettle body, the kettle body and the front end cover are fixed by a fixing device, the sealing device includes a sealing ring arranged on the front end cover and sleeved outside the kettle body, an annular fixing plate arranged outside the kettle body, a clamping mechanism arranged on the fixing plate, and a driving mechanism arranged on one side of the kettle body, the driving mechanism is used to drive the clamping mechanism to press against the sealing ring, and the inner side wall of the front end cover is provided with a mounting device connected to the rotating shaft. The present application has the effect of improving the sealing reliability of the connection between the front end cover and the kettle body.

Description

Technical Field

[0001] The present application relates to the technical field of polymerization kettles, and in particular to a mechanical sealing structure for a horizontal high-pressure polymerization kettle. Background Art

[0002] The polymerization reaction in the polymerization kettle is an exothermic reaction. The heat released during the polymerization reaction not only easily accelerates the aging and damage of the polymerization kettle, but also heats the materials in the polymerization kettle, which will change the properties of the materials after being heated, thereby affecting the quality of the polymerization product.

[0003] However, in the process of implementing the relevant technical solutions, it was found that at least the following technical problems exist: after the polymerization kettle has been used for a long time, it is often necessary to open the front end cover to facilitate workers to inspect or clean the kettle body. However, after the inspection or cleaning, when the front end cover needs to be reinstalled on the kettle body, the sealing of the connection between the front end cover and the kettle body is unreliable. Summary of the invention

[0004] The present application provides a mechanical sealing structure for a horizontal high-pressure polymerization reactor, thereby solving the problem of unreliable sealing of the connection between the front end cover and the reactor body in the prior art, and effectively improving the sealing reliability after the front end cover and the reactor body are connected.

[0005] The present application provides a mechanical sealing structure for a horizontal high-pressure polymerization kettle, comprising a sealing device arranged on a kettle body, wherein a rotating shaft is rotatably connected in the kettle body, and the kettle body and a front end cover are fixed by a fixing device, and the sealing device comprises a sealing ring arranged on the front end cover and sleeved on the outside of the kettle body, an annular fixing plate arranged outside the kettle body, a clamping mechanism arranged on the fixing plate, and a driving mechanism arranged on one side of the kettle body, wherein the driving mechanism is used to drive the clamping mechanism to press against the sealing ring, and the inner side wall of the front end cover is provided with a mounting device connected to the rotating shaft.

[0006] Furthermore, a mounting groove is provided at the end of the kettle body, and a mounting ring inserted into the mounting groove is provided on the end surface of the front end cover.

[0007] Furthermore, the clamping mechanism includes a fixed seat arranged on the fixed plate, a clamping block slidably arranged on the fixed seat, and a clamping spring connecting the clamping block and the fixed seat. One end of the clamping block is formed with an inclined surface that presses against the conical surface of the sealing ring, and there are multiple fixed seats evenly arranged along the circumference of the fixed plate.

[0008] Furthermore, the driving mechanism includes a driving ring rotatably arranged on a fixed plate, a driving block arranged on the inner wall of the driving ring and pressed against a clamping block, a lifting block fixed to the circumferential side wall of the driving ring, and a cylinder arranged on one side of the kettle body. The driving blocks are arranged in multiple numbers evenly along the circumference of the driving ring, and the driving blocks correspond to the clamping blocks one by one. The end of the driving block pressed against the clamping block is an arc surface, and the distance between one end of the arc surface and the driving ring is greater than the distance between the other end of the arc surface and the driving ring. The end of the clamping block is formed with a fillet that matches the arc surface. The kettle body is arranged on a base, one end of the cylinder is hinged to the base, and the telescopic end of the cylinder is hinged to one end of the lifting block.

[0009] Furthermore, the mounting device includes a sleeve arranged on one side of the front end cover, a positioning seat rotatably arranged on the sleeve, and a positioning assembly arranged on the mounting seat. A slot is provided on the positioning seat, and the end of the rotating shaft is inserted into the slot. The positioning assembly is snap-fitted with the end of the rotating shaft.

[0010] Furthermore, a positioning ring is provided in the sleeve, and a transmission roller is connected to the circumferential rotation of the positioning ring. The axis of the transmission roller is consistent with the axis of the rotating shaft. There are multiple transmission rollers evenly arranged along the circumference of the positioning ring, and the surface of the transmission roller abuts against the mounting seat.

[0011] Furthermore, a positioning groove is provided at the bottom of the slot, a clamping groove corresponding to the positioning groove is provided at the end of the rotating shaft, and the positioning assembly includes a positioning block slidably connected to the positioning groove, and a positioning spring connecting the positioning block and the bottom of the positioning groove, the positioning block is inserted into the clamping groove, and the cross-section of the positioning block is a polygon.

[0012] Furthermore, the fixing device comprises a vertical rod arranged on the outer side wall of the front end cover, and a movable plate arranged at the lower end of the vertical rod, and a power mechanism for driving the movable plate to approach or move away from the kettle body is arranged at one end of the kettle body.

[0013] Furthermore, the power mechanism includes a moving screw rotatably arranged on one side of the kettle body, a moving guide rod arranged on one side of the moving screw and parallel to the moving screw, and a moving slide threadedly connected to the moving screw. The moving plate is fixed on the moving slide, and the axial direction of the moving screw is consistent with the length direction of the kettle body.

[0014] Furthermore, a supporting device is provided at one end of the kettle body, and the supporting device includes a supporting seat arranged at one end of the kettle body and a supporting unit hinged on the supporting seat, the supporting unit includes a supporting rod whose ends are hinged to each other, and two supporting units are symmetrically provided, and a mounting seat is fixed to the hinge points of the two supporting units, a supporting motor is provided on one of the mounting seats, the output shaft of the supporting motor passes through the mounting seat and is fixed with a supporting screw, the end of the supporting screw is threadedly connected to the other mounting seat, the upper ends of the two supporting rods located above are hinged on a connecting seat, and a supporting plate abutting against the rotating shaft is provided on the top of the connecting seat.

[0015] The technical solution provided in this application has at least the following technical effects or advantages:

[0016] 1. Due to the use of a sealing device, the sealing of the connection between the front end cover and the kettle body can be strengthened after the front end cover is closed on the kettle body. By pressing the sealing ring, not only the connection stability between the front end cover and the kettle body is improved, but also the sealing reliability between the front end cover and the kettle body can be strengthened, which effectively solves the problem of unreliable sealing of the connection between the front end cover and the kettle body in the prior art, and effectively improves the sealing reliability after the connection between the front end cover and the kettle body.

[0017] 2. Due to the use of the installation device, after the front end cover is installed, the end of the shaft can be stably installed and supported, the stability of the shaft during rotation is improved, the front end cover is easily disassembled, and the quick installation and positioning of the shaft is ensured without affecting the operation of the shaft.

[0018] 3. Due to the use of a fixing device, the front end cover can be easily disassembled and assembled, and the front end cover can be automatically driven away from the kettle body, thereby improving the efficiency of inspection or cleaning of the kettle body. The fixing device can also strengthen the connection between the front end cover and the kettle body, thereby improving the sealing effect of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present application;

[0020] Figure 2 It is a schematic structural diagram of the sealing device in the embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the connection structure between the front end cover and the kettle body in the embodiment of the present application;

[0022] Figure 4 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0023] Figure 5 This is a schematic diagram of the structure after the front end cover in the embodiment of the present application is disassembled;

[0024] Figure 6 for Figure 3 The enlarged schematic diagram of point B in the middle;

[0025] In the figure: 1, kettle body; 11, front cover; 111, mounting ring; 12, base; 13, rotating shaft; 131, slot; 14, mounting slot; 2, sealing device; 21, sealing ring; 22, fixing plate; 3, clamping mechanism; 31, fixing seat; 32, clamping block; 33, clamping spring; 4, driving mechanism; 41, driving ring; 42, driving block; 43, lifting block; 44, cylinder; 5, fixing device; 51, vertical rod; 511, first rod body; 512, second rod body; 52, moving plate; 6, power mechanism; 61, moving screw; 62, moving guide rod; 63, moving slide Seat; 64, moving motor; 7, flip device; 71, flip shaft; 72, flip rod; 73, flip seat; 74, movable seat; 75, flip screw; 76, flip guide rod; 77, flip motor; 8, supporting device; 81, supporting seat; 82, supporting rod; 83, mounting seat; 84, supporting motor; 85, supporting screw; 86, supporting plate; 9, mounting device; 91, bushing; 92, positioning seat; 921, slot; 922, positioning groove; 93, positioning assembly; 931, positioning block; 932, positioning spring; 94, cover plate; 95, positioning ring; 96, transmission roller. DETAILED DESCRIPTION

[0026] The embodiment of the present application discloses a mechanical sealing structure for a horizontal high-pressure polymerization kettle, in which a front end cover 11 is stably mounted on the kettle body 1 through a fixing device 5, thereby improving the sealing effect of the front end cover 11 and the kettle body 1 at the connection, and then a sealing ring 21 is pressed against the outer surface of the kettle body 1 through a sealing device 2, thereby further strengthening the sealing of the connection part between the front end cover 11 and the kettle body 1, effectively solving the problem of unreliable sealing of the connection part between the front end cover 11 and the kettle body 1 in the prior art, and effectively improving the sealing reliability of the front end cover 11 and the kettle body 1 after the connection.

[0027] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Reference Figure 1 , Figure 2 and Figure 3A mechanical seal structure for a horizontal high-pressure polymerization kettle is used to strengthen the sealing performance of the connection between the kettle body 1 and the front end cover 11. It includes a sealing device 2 and a fixing device 5. The front end cover 11 and the kettle body 1 are connected by the fixing device 5. The front end cover 11 is installed at the end of the kettle body 1, and the sealing performance between the two is strengthened by the sealing device 2. The sealing device 2 includes a sealing ring 21, a fixing plate 22, a clamping mechanism 3, and a driving mechanism 4. The axis of the kettle body 1 is horizontally arranged. The kettle body 1 is fixedly installed on the base 12, and a rotating shaft 13 is rotatably connected in the kettle body 1. A stirring blade is fixedly installed on the rotating shaft 13. The end of the front end cover 11 and the end of the kettle body 1 are mutually attached and pressed. In order to strengthen the connection between the front end cover 11 and the kettle body 1, a mounting groove 14 is opened at the end of the kettle body 1. The mounting groove 14 is an annular groove. A mounting ring 111 is fixedly installed on the end face of the front end cover 11. A sealing ring is fixedly bonded to the end face of the mounting ring 111 away from the front end cover 11. The mounting ring 111 is inserted into the mounting groove 14. A fixing device 5 is installed at one end of the kettle body 1, which is used to press the front end cover 11 against the end of the kettle body 1, so that the front end cover 11 is stably installed at the end of the kettle body 1. The sealing ring 21 is fixedly installed on the outer wall of the front end cover 11 and close to the end of the front end cover 11. When the front end cover 11 is fixedly installed at the end of the kettle body 1, the sealing ring 21 is sleeved on the kettle body 1 and fits with the outer wall of the kettle body 1. The fixing plate 22 is in a ring shape and is fixedly installed at a position close to the end of the kettle body 1, and the fixing plate 22 is located on the side of the sealing ring 21 away from the end of the kettle body 1. The clamping mechanism 3 is installed on the fixing plate 22, and the driving mechanism 4 is installed on one side of the kettle body 1. Through the operation of the driving mechanism 4, the clamping mechanism 3 can press the sealing ring 21, so that the inner surface of the sealing ring 21 is pressed against the outer surface of the kettle body 1, thereby achieving stability of the connection between the front end cover 11 and the kettle body 1.

[0029] Reference Figure 2 , Figure 3 and Figure 4The clamping mechanism 3 includes a fixed seat 31, a clamping block 32, and a clamping spring 33. The fixed seat 31 is fixedly installed on the side of the fixed plate 22 close to the front end cover 11, and multiple fixed seats 31 are evenly arranged along the circumference of the fixed plate 22. The clamping block 32 is plugged into the center of the fixed seat 31, and the extension line of the sliding direction of the clamping block 32 passes through the center of the sealing ring 21. Connecting pieces are fixed on the opposite sides of the clamping block 32. A sliding rod is fixedly installed on the connecting piece. The sliding rod passes through the fixed seat 31 and fixes the limit piece. A clamping spring 33 is sleeved on the sliding rod. The two ends of the clamping spring 33 are respectively fixedly connected to the connecting piece and the fixed seat 31. By pressing the clamping block 32, the clamping block 32 can be driven to move close to the center of the sealing ring 21 to clamp the outer wall of the sealing ring 21. A conical surface is formed on the outer wall of the sealing ring 21 and away from the fixed plate 22, and an inclined surface is formed at the end of the clamping block 32 to press against the conical surface of the sealing ring 21. Through the cooperation of the inclined surface and the conical surface, there can be an extrusion force on the sealing ring 21 toward the fixed plate 22, thereby improving the sealing reliability of the sealing ring 21 to the front end cover 11 and the kettle body 1.

[0030] Reference Figure 2 , Figure 3 and Figure 4The driving mechanism 4 includes a driving ring 41, a driving block 42, a lifting block 43, and a cylinder 44. The driving ring 41 is rotatably connected to the end surface of the fixed plate 22 close to the sealing ring 21, and is coaxially arranged with the sealing ring 21. The driving block 42 is fixedly installed on the inner side wall of the driving ring 41. A plurality of driving blocks 42 are evenly arranged along the circumference of the driving ring 41, and the number of driving blocks 42 corresponds to the number of pressing blocks 32. Each driving block 42 abuts against the end of a pressing block 32 away from the sealing ring 21. The end of the driving block 42 abutting against the pressing block 32 is an arc surface, and the distance between one end of the arc surface and the driving ring 41 is greater than the distance between the other end of the arc surface and the driving ring 41. The end with a smaller distance between the end of the arc surface and the driving ring 41 is defined as the small end of the driving block 42, and the end with a larger distance between the end of the arc surface and the driving ring 41 is defined as the large end of the driving block 42. The end of the pressing block 32 is formed with a fillet that matches the arc surface. An annular protective cover is fixedly mounted on the fixed plate 22 and at one end close to the sealing ring 21, and one end of the lifting block 43 is fixed on the peripheral side wall of the driving ring 41 and at a position close to one side of the kettle body 1. An arc-shaped limiting groove is provided on the protective cover, and the other end of the lifting block 43 passes through the limiting groove and slides with the limiting groove. One end of the cylinder 44 is hinged to the base 12, and the telescopic end of the cylinder 44 is hinged to one end of the lifting block 43. By driving the cylinder 44 to extend and retract, the lifting block 43 can be driven to slide along the limit groove, and the driving ring 41 can be pulled to rotate around its own center as the axis, thereby driving the driving block 42 to move. When the small end of the driving block 42 abuts against the clamping block 32, the clamping block 32 is farthest from the sealing ring 21. When the driving ring 41 is driven to rotate counterclockwise, the position where the clamping block 32 abuts against the arc surface of the driving block 42 moves from the small end of the driving block 42 to the large end of the driving block 42, so that the clamping block 32 slides along the fixing seat 31 toward the center of the sealing ring 21, squeezes the sealing ring 21, and causes the clamping block 32 to drive the sealing ring 21 to be pressed against the outer wall of the kettle body 1.

[0031] Reference Figure 2 , Figure 3The fixing device 5 includes a vertical rod 51 and a movable plate 52. One end of the vertical rod 51 is fixedly installed on the outer side wall of the front end cover 11, and two are installed symmetrically about the center of the front end cover 11. The other end of the vertical rod 51 extends vertically downward. The movable plate 52 is fixedly installed on the lower end surface of the vertical rod 51, and the movable plate 52 is horizontally arranged. A power mechanism 6 for driving the movable plate 52 to approach or move away from the kettle body 1 is installed on the base 12. The movable plate 52 is driven by the power mechanism 6 to approach the kettle body 1, so that the front end cover 11 is pressed against the end of the kettle body 1. The movable plate 52 is driven by the power mechanism 6 to move away from the kettle body 1, so that the front end cover 11 is removed. The power mechanism 6 includes a moving screw 61, a moving guide rod 62, a moving slide 63 and a moving motor 64. The moving screw 61 is rotatably connected to the base 12, the moving guide rod 62 is fixed to the base 12, the moving screw 61 and the moving guide rod 62 are parallel to each other, and the length direction of the moving screw 61 is consistent with the length direction of the kettle body 1, the moving slide 63 is threadedly connected to the moving screw 61, and the moving guide rod 62 passes through the moving slide 63 and slides with the moving slide 63, the moving plate 52 is fixed to the moving slide 63, and the moving motor 64 is fixedly installed on the base 12, and the output shaft of the moving motor 64 is fixedly connected to the end of the moving screw 61. By driving the moving motor 64, the moving screw 61 can be driven to rotate forward or reverse, thereby driving the moving plate 52 to approach or move away from the end of the kettle body 1.

[0032] Reference Figure 1 , Figure 2 and Figure 3In order to improve the storage of the front end cover 11, a flip device 7 is installed on the mobile plate 52. The flip device 7 includes a flip shaft 7113, a flip rod 72, a flip seat 73, a movable seat 74, a flip lead screw 75, a flip guide rod 76, and a flip motor 77. The flip seat 73 is fixedly installed on the mobile plate 52, and two flip seats 73 are arranged at intervals along the length direction of the mobile plate 52. The two ends of the flip lead screw 75 are respectively rotatably connected with the end faces facing the two flip seats 73, and the two ends of the flip guide rod 76 are respectively fixedly connected with the end faces facing the two flip seats 73. The flip lead screw 75 and the flip guide rod 76 are parallel to each other, and the length direction of the flip lead screw 75 is consistent with the length direction of the moving lead screw 61. The flip motor 77 is fixedly installed on the mobile plate 52, and the output shaft of the flip motor 77 is fixedly connected with one end of the flip lead screw 75. The flip guide rod 76 and the flip lead screw 75 both pass through the movable seat 74, and the flip guide rod 76 is slidably matched with the movable seat 74, and the flip lead screw 75 is threadedly connected with the movable seat 74. The vertical rod 51 includes a first rod body 511 and a second rod body 512. One end of the first rod body 511 is fixedly connected to the front end cover 11, one end of the second rod body 512 is fixedly connected to the movable plate 52, the other ends of the first rod body 511 and the second rod body 512 are hinged to each other, and the two hinges are fixedly connected through a flip shaft 7113. One end of the flip rod 72 is hinged to one side of the first rod body 511, and the other end of the flip rod 72 is hinged to one side of the movable seat 74. By starting the flip motor 77, the movable seat 74 can be driven to approach or move away from the kettle body 1 along the flip lead screw 75, and then the flip rod 72 can be driven to push the first rod body 511 and the second rod body 512 to be perpendicular to each other, and the front end cover 11 is made upright. When the movable seat 74 is driven to move away from the kettle body 1 along the flip lead screw 75, the first rod body 511 can be pulled to fold above the movable plate 52, and then the front end cover 11 can be laid flat, which is convenient for storing the front end cover 11, and it is convenient for workers to inspect or clean the kettle body 1.

[0033] Reference Figure 3 , Figure 5A support device 8 is installed on the base 12 and at one end of the kettle body 1, which can support and position the rotating shaft 13 after the front cover 11 is removed, effectively reducing the influence of the accuracy of the rotating shaft 13 due to the excessive weight of the rotating shaft 13 during maintenance. The support device 8 includes a support seat 81 and a support unit. The support seat 81 is fixedly installed on the base 12 and is located between the fixing device 5 and the kettle body 1. The support unit includes a support rod 82 whose ends are hinged to each other. Two support units are symmetrically arranged. The two support rods 82 of each support unit are V-shaped, and the V-shapes of the two support units are arranged facing each other. A mounting seat 83 is fixed to the hinge point of the two support units. A support motor 84 is fixedly installed on one mounting seat 83. The output shaft of the support motor 84 passes through the mounting seat 83 and is fixed with a support screw 85. The end of the support screw 85 is threadedly connected to the other mounting seat 83. A stopper is fixedly installed at the other end of the support screw 85. The upper ends of the two support rods 82 located above are hinged on a connecting seat. An arc-shaped support plate 86 is fixedly installed on the top of the connecting seat. The rotating shaft 13 can be inserted into the support plate 86 to obtain support.

[0034] Reference Figure 3 , Figure 6, a mounting device 9 is installed on the inner side wall of the front end cover 11, which can support and connect the end of the rotating shaft 13 after the front end cover 11 is covered on the end of the kettle body 1. The mounting device 9 includes a sleeve 91, a positioning seat 92, and a positioning assembly 93. The sleeve 91 is fixedly installed on the inner side wall of the front end cover 11, and a cover plate 94 is installed on the end of the sleeve 91 away from the kettle body 1. The end of the sleeve 91 is formed with an edge, and the cover plate 94 is fixedly connected to the edge by multiple bolts. The positioning seat 92 is cylindrical and rotatably installed on the inner side wall of the cover plate 94. The centers of the sleeve 91 and the positioning seat 92 are coincident with the center of the rotating shaft 13. A slot 921 is opened at the end of the positioning seat 92, and the end of the rotating shaft 13 is inserted into the slot 921. The slot 921 is formed with a guide opening on the groove wall away from the cover plate 94. The positioning assembly 93 is installed on the positioning seat 92, and the positioning assembly 93 is snap-fitted with the end of the rotating shaft 13. The positioning assembly 93 includes a positioning block 931 and a positioning spring 932. The bottom of the slot 921 is provided with a positioning slot 922. The end of the rotating shaft 13 is provided with a card slot 131 corresponding to the positioning slot 922. The positioning block 931 is inserted into the card slot 131. The cross-sections of the positioning block 931 and the card slot 131 are polygonal, specifically, regular hexagonal. The two ends of the positioning spring 932 are respectively fixedly connected to the positioning block 931 and the bottom of the positioning slot 922. The rotating shaft 13 is inserted into the slot 921. Under the action of the positioning spring 932, the positioning block 931 is inserted into the card slot 131. When the rotating shaft 13 rotates, it can drive the positioning seat 92 to rotate. In order to improve the protection of the positioning seat 92, a positioning ring 95 is fixedly installed in the sleeve 91. The positioning ring 95 is sleeved on the outer side of the positioning seat 92, and the circumferential rotation of the positioning ring 95 is connected to a transmission roller 96. The axis of the transmission roller 96 is consistent with the axis of the rotating shaft 13. There are multiple transmission rollers 96 evenly arranged along the circumference of the positioning ring 95, and the surface of the transmission roller 96 abuts against the mounting seat 83.

[0035] The working principle of the embodiment of the present application is as follows: when installing the front end cover 11, first start the flip motor 77, so that the first rod body 511 and the second rod body 512 are in a vertical state, flip the front end cover 11 and align it with the end of the kettle body 1, then start the moving motor 64, drive the moving plate 52 to approach the kettle body 1, so that the mounting ring 111 at the end of the front end cover 11 is inserted into the mounting groove 14. Then start the cylinder 44, so that the cylinder 44 extends, drives the drive ring 41 to rotate counterclockwise, so that the drive block 42 squeezes the pressing block 32, and then the sealing ring 21 is pressed against the outer wall of the kettle body 1 and the front end cover 11 is pressed against the end of the kettle body 1, thereby enhancing the sealing reliability of the connection between the front end cover 11 and the kettle body 1.

[0036] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0037] What has been described above is only a preferred specific implementation manner of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A mechanical seal structure for a horizontal high-pressure polymerization reactor, comprising a sealing device (2) arranged on a reactor body (1), a rotating shaft (13) rotatably connected inside the reactor body (1), the reactor body (1) and a front end cover (11) are fixed by a fixing device (5), characterized in that: The sealing device (2) comprises a sealing ring (21) arranged on the front end cover (11) and sleeved on the outside of the kettle body (1), an annular fixing plate (22) arranged outside the kettle body (1), a pressing mechanism (3) arranged on the fixing plate (22), and a driving mechanism (4) arranged on one side of the kettle body (1); The driving mechanism (4) is used to drive the pressing mechanism (3) to press against the sealing ring (21), and the inner side wall of the front end cover (11) is provided with a mounting device (9) connected to the rotating shaft (13); The clamping mechanism (3) comprises a fixed seat (31) arranged on the fixed plate (22), a clamping block (32) slidably arranged on the fixed seat (31), and a clamping spring (33) connecting the clamping block (32) and the fixed seat (31); one end of the clamping block (32) is formed with an inclined surface that presses against the conical surface of the sealing ring (21); and a plurality of fixed seats (31) are evenly arranged along the circumference of the fixed plate (22); The driving mechanism (4) comprises a driving ring (41) rotatably arranged on a fixed plate (22), a driving block (42) arranged on the inner side wall of the driving ring (41) and pressed against a pressing block (32), a lifting block (43) fixed to the peripheral side wall of the driving ring (41), and a cylinder (44) arranged on one side of the kettle body (1). A plurality of the driving blocks (42) are evenly arranged along the circumference of the driving ring (41), and the driving blocks (42) correspond to the clamping blocks (32) one by one. One end of the driving block (42) and the clamping block (32) pressed against each other is an arc surface, and the distance between one end of the arc surface and the driving ring (41) is greater than the distance between the other end of the arc surface and the driving ring (41). The end of the clamping block (32) is formed with a fillet that matches the arc surface. The kettle body (1) is arranged on the base (12), one end of the cylinder (44) is hinged to the base (12), and the telescopic end of the cylinder (44) is hinged to one end of the lifting block (43); The mounting device (9) comprises a shaft sleeve (91) arranged on one side of the front end cover (11), a positioning seat (92) rotatably arranged on the shaft sleeve (91), and a positioning assembly (93) arranged on the mounting seat (83); a slot (921) is provided on the positioning seat (92); an end of the rotating shaft (13) is inserted into the slot (921), and the positioning assembly (93) is snap-fitted with the end of the rotating shaft (13).

2. A mechanical seal structure for a horizontal high-pressure polymerization reactor as claimed in claim 1, characterized in that: The end of the kettle body (1) is provided with a mounting groove (14), and the end surface of the front end cover (11) is provided with a mounting ring (111) inserted into the mounting groove (14).

3. A mechanical seal structure for a horizontal high-pressure polymerization reactor as claimed in claim 1, characterized in that: A positioning ring (95) is arranged inside the shaft sleeve (91), and the positioning ring (95) is connected to a transmission roller (96) for circumferential rotation. The axis of the transmission roller (96) is consistent with the axis of the rotating shaft (13). A plurality of transmission rollers (96) are evenly arranged along the circumference of the positioning ring (95), and the surface of the transmission roller (96) is in contact with the mounting seat (83).

4. A mechanical seal structure for a horizontal high-pressure polymerization reactor as claimed in claim 1, characterized in that: The bottom of the slot (921) is provided with a positioning slot (922); the end of the rotating shaft (13) is provided with a clamping slot (131) corresponding to the positioning slot (922); the positioning assembly (93) comprises a positioning block (931) slidably connected to the positioning slot (922) and a positioning spring (932) connecting the positioning block (931) and the bottom of the positioning slot (922); the positioning block (931) is inserted into the clamping slot (131); and the cross section of the positioning block (931) is polygonal.

5. The mechanical seal structure for a horizontal high-pressure polymerization reactor according to claim 1, characterized in that: The fixing device (5) comprises a vertical rod (51) arranged on the outer side wall of the front end cover (11) and a movable plate (52) arranged at the lower end of the vertical rod (51); and a power mechanism (6) for driving the movable plate (52) to move closer to or away from the kettle body (1) is arranged at one end of the kettle body (1).

6. A mechanical seal structure for a horizontal high-pressure polymerization reactor as claimed in claim 5, characterized in that: The power mechanism (6) comprises a movable lead screw (61) rotatably arranged on one side of the kettle body (1), a movable guide rod (62) arranged on one side of the movable lead screw (61) and parallel to the movable lead screw (61), and a movable slide seat (63) threadedly connected to the movable lead screw (61); the movable plate (52) is fixed on the movable slide seat (63); and the axial direction of the movable lead screw (61) is consistent with the length direction of the kettle body (1).

7. A mechanical seal structure for a horizontal high-pressure polymerization reactor as claimed in claim 1, characterized in that: A support device (8) is provided at one end of the kettle body (1), and the support device (8) comprises a support seat (81) provided at one end of the kettle body (1), and a support unit hinged on the support seat (81), and the support unit comprises a support rod (82) whose ends are hinged to each other, and two support units are symmetrically provided, and a mounting seat (83) is fixed to the hinge points of the two support units, and a support motor (84) is provided on one of the mounting seats (83), and the output shaft of the support motor (84) passes through the mounting seat (83) and is fixed with a support screw (85), and the end of the support screw (85) is threadedly connected to the other mounting seat (83), and the upper ends of the two support rods (82) located above are hinged on a connecting seat, and the top of the connecting seat is provided with a support plate (86) that abuts against the rotating shaft (13).

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