Isobaric kettle

Abstract

The utility model provides an isobaric kettle and belongs to the technical field of high-pressure containers. The problem that a cover body in an existing isobaric kettle cannot be inserted in place when a kettle body is closed is solved. The isobaric kettle comprises a kettle body and a cover body inserted into the top end of the kettle body, a stand column is arranged on one side of the kettle body, a rotating arm located above the kettle body is hinged to the stand column, a lifting cylinder connected with the cover body is fixed to the rotating arm, a rotating cylinder is connected between the rotating arm and the stand column, and a limiting column is vertically arranged on the other side of the kettle body. A limiting rod corresponding to the limiting column is fixedly connected to the rotating arm, an inserting hole is formed in the top face of the limiting column, a notch communicated with the inserting hole is formed in the outer side face of the limiting column, and when the rotating arm rotates around the stand column, the bottom end of the limiting rod can enter the inserting hole through the notch; the cover body can be located over the kettle body, and a movable gap is formed between the outer side face of the bottom end of the limiting rod and the hole wall face of the inserting hole. The isobaric kettle enables the cover body to be smoothly inserted in place.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure containers and relates to an isobaric autoclave. Background Art

[0002] An isobaric autoclave, also known as a hydraulic press, is a high-pressure vessel used for the compression molding of large and shaped polytetrafluoroethylene (PTFE) products that cannot be formed in one go by compression molding. This process utilizes Pascal's principle, which states that pressure applied to a liquid in a sealed container is uniformly transmitted in all directions without changing magnitude. Various PTFE products are molded under the ultra-high pressures of an isobaric autoclave (maximum pressure of 32 MPa), resulting in highly isotropic products that hold an irreplaceable market position.

[0003] An isobaric reactor consists of a reactor body and a lid that covers the reactor body. The lid needs to be opened when adding materials to the reactor body. To improve work efficiency, isobaric reactors are currently typically equipped with a lid-opening and closing mechanism for opening and closing the lid. For example, Chinese patent document (publication number CN202666792U) discloses a high-pressure reactor opening and closing device comprising a cylindrical reactor body with a sealing lid on top, secured by two clamps. A mounting base is provided on one side of the reactor body, and a column is mounted on the mounting base. The column is parallel to the reactor body. A rotating arm cylinder is located above the column. One end of the rotating arm cylinder is fixed to the column, and the other end is connected to a rotating arm. A lifting cylinder is located within the rotating arm, and the lifting cylinder is connected to the sealing lid. Another example is Chinese patent document (publication number CN117021447A) discloses a process and equipment for producing polytetrafluoroethylene isopipes. The process comprises an isobaric reactor body, a lid inserted into the upper end of the reactor body, and triangular connecting chambers on the side walls of the reactor body. A rotating arm is provided above the cover body, and a column is provided on the triangular connecting bin. The rotating arm and the column are hinged and a rotating cylinder is connected between the two. A lifting cylinder is connected between the cover body and the rotating arm. The lifting and swinging of the cover body can be controlled by the rotating arm.

[0004] When opening the lid, the lifting cylinder drives the lid upward, then the rotating cylinder drives the arm to rotate and move the lid away. When closing the lid, the rotating cylinder drives the arm to rotate so that the lid is directly above the kettle. To prevent the arm from rotating during the lifting cylinder's operation, which could cause the lid and kettle to become misaligned, the rotating cylinder maintains oil pressure to keep the arm stationary. The lifting cylinder then drives the lid downward to insert it into the top of the kettle. Before closing the lid, the rotating cylinder needs to accurately rotate the lid directly above the kettle. However, in actual production, due to errors (including motion errors, machining errors, and installation errors), the lid and kettle can easily become misaligned and become stuck during insertion, preventing the lid from being inserted smoothly. To prevent this, the common practice is to improve the motion accuracy of the rotating cylinder, namely, purchasing and installing a rotating cylinder with higher motion accuracy. However, this can significantly increase the manufacturing cost of the equipment. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the prior art and propose an isobaric kettle, which solves the technical problem of how to smoothly insert the cover into place when closing the kettle.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] The top end face of the lifting post is fixedly provided with a lifting post, and the lifting post is fixedly provided with a lifting post on the lifting post.

[0008] When the cover is closed, the rotating cylinder drives the rotating arm to rotate so that the cover is located directly above the kettle body. The limit rod fixed on the rotating arm moves synchronously, and the bottom end of the limit rod enters the socket from the notch of the limit column. The limit rod is inserted in the socket and has a limiting effect, which can prevent the rotating arm from deflecting after the rotating cylinder is depressurized to a certain extent. Then the rotating cylinder is depressurized, and the lifting cylinder drives the cover to descend and be inserted into the kettle body. During the insertion process, since the rotating cylinder has been depressurized and there is a movable gap between the outer side surface of the bottom end of the limit rod and the wall surface of the socket, the cover can adaptively make micro-movements and be smoothly inserted into place.

[0009] This isobaric autoclave adopts reverse thinking, breaking the constraints of the conventional thinking that the cover body is aligned and does not move in the prior art. Limiting posts and limiting rods are set for limiting, and the rotating cylinder is depressurized after completing the rotation. At the same time, a movable gap is set between the limiting posts and the limiting rods, so that the cover body can move adaptively during the process of being inserted into the autoclave body, thereby allowing the cover body to be smoothly inserted into place.

[0010] In the above-mentioned isobaric autoclave, the limiting column is respectively provided with protruding protrusions on the two side walls located at the notch, and the bottom end of the limiting rod has a cylindrical matching section corresponding to the position of the protrusion. The distance between the two protrusions is smaller than the outer diameter of the matching section. The protrusion and / or the matching section can undergo elastic deformation so that the matching section can enter and exit the insertion hole between the two protrusions.

[0011] When the rotating cylinder is pressurized, the mating section of the limit rod causes the protrusion or / and the mating section to undergo elastic deformation under the action of the rotating cylinder, so that it can enter and exit the insertion hole between the two protrusions. After the rotating cylinder is depressurized, the action of the rotating cylinder disappears, and the protrusion has a blocking and limiting effect on the limit rod, preventing the mating section from moving out of the insertion hole from the notch. This can further ensure the limiting effect of the limit column on the limit rod, and ensure that after the rotating cylinder is depressurized, the limit is achieved through the cooperation of the limit column and the limit rod, preventing the rotating arm from rotating at will, so that the cover body can be smoothly inserted into the kettle body and inserted into place.

[0012] In the above-mentioned isobaric autoclave, the socket is a cylindrical hole, the protrusion is located at the upper part of the notch, the distance between the two side walls of the limiting column located at the lower part of the notch is equal to the aperture of the socket, and the outer surface of the bottom end of the limiting rod is located below the mating section and has a protruding lower ring, and the outer diameter of the lower ring is smaller than the aperture of the socket.

[0013] The protrusion is located only on the upper portion of the notch. This allows the lower ring to enter and exit the insertion hole unimpeded through the lower portion of the notch when the autoclave lid is opened or closed. This reduces resistance to the limit rod entering and exiting the insertion hole when the rotary cylinder drives the rotating shaft. Furthermore, the protrusion of the lower ring appropriately reduces the clearance between the bottom end of the limit rod and the wall of the insertion hole, preventing excessive clearance from causing excessive displacement of the lid and affecting smooth insertion. Furthermore, during the production and assembly of the autoclave, the lower ring serves as a marker, facilitating alignment of the mating section with the protrusion.

[0014] In the above-mentioned isobaric autoclave, the socket is a blind hole, and a protruding upper ring is provided on the outer surface of the bottom end of the limiting rod above the limiting column. The outer diameter of the upper ring is larger than the aperture of the socket, and there is a spacing distance between the bottom surface of the limiting rod and the bottom surface of the socket.

[0015] The upper ring has an axial limiting effect on the limit rod, preventing the limit rod from being inserted too much into the socket and causing the bottom surface of the limit rod to contact the bottom surface of the socket, so that the limit rod can smoothly enter and exit through the gap, thereby allowing the rotating cylinder to smoothly drive the rotating arm to rotate and complete the opening and closing of the cover body.

[0016] In the aforementioned isobaric autoclave, the receptacle and the limiting rod are both vertically arranged. The side of each protrusion facing the other protrusion is flat and vertically arranged, and the transition between the side of each protrusion facing the other protrusion and the wall of the receptacle is an arcuate surface. This ensures that the bottom end of the limiting rod is retained in the receptacle when the rotary cylinder is depressurized, and that the limiting rod can be smoothly removed from the receptacle through the protrusion when the rotary cylinder is pressurized, allowing the cover to be opened and closed smoothly.

[0017] In the aforementioned isobaric autoclave, the lid has a protruding positioning ring on its outer side, and the outer side of the positioning ring has a guide surface in the shape of a conical surface with a larger top and a smaller bottom. The guide surface guides the lid during insertion into the autoclave, thereby ensuring that the lid can adaptively move radially slightly, allowing the lid to be smoothly inserted into place.

[0018] In the aforementioned isobaric autoclave, the top opening of the autoclave body has a positioning surface on the wall thereof, corresponding to the positioning ring. The positioning surface is conical, larger at the top and smaller at the bottom. The guide surface has a greater taper than the positioning surface, and the upper end of the guide surface is capable of abutting the center of the positioning surface. The lid and the autoclave body are positioned by the positioning surface, and the conical positioning surface allows the lid to be self-aligned within the autoclave body, ensuring smooth insertion.

[0019] In the aforementioned isobaric autoclave, a slot is defined on the wall surface of the top opening of the autoclave body, above the positioning surface. The lid is secured to a plurality of circumferentially arranged locking cylinders. The piston rod of each locking cylinder faces radially outward and is secured to a locking block that can be inserted into the slot. When the lid is opened, the locking cylinders drive the locking block out of the slot, allowing the lid to move upward. When the lid is closed, after the lid is inserted into the top opening of the autoclave body, the locking rods drive the locking block into the slot, locking the lid.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] A limit rod and a limit column are provided, and the bottom end of the limit rod is inserted into the socket of the limit column and there is a movable gap between the hole wall of the socket. The rotating cylinder can release pressure after driving the rotating arm to make the cover body directly above the kettle body, so that the cover body can adaptively move slightly during the insertion process of the kettle body, so that the cover body can be smoothly inserted into place. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the first embodiment of the isostatic autoclave.

[0023] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0024] Figure 3 This is a partial front view of the limiting column in the first embodiment of the isobaric autoclave.

[0025] Figure 4 yes Figure 3 Cross-sectional view along the BB direction.

[0026] Figure 5 yes Figure 3 Cross-sectional view in CC direction.

[0027] Figure 6 It is a partial cross-sectional view of the fitting portion between the cover and the autoclave in the first embodiment of the isobaric autoclave.

[0028] Figure 7 yes Figure 6 Enlarged view of point D in the middle.

[0029] In the figure, 1, kettle body; 1a, positioning surface; 1b, slot; 2, cover body; 2a, positioning ring; 2a1, guide surface; 3, fixed seat; 4, column; 5, rotating arm; 6, lifting cylinder; 7, rotating cylinder; 8, limiting column; 8a, socket; 8b, notch; 8c, protrusion; 9, limiting rod; 9a, matching section; 9b, lower ring; 9c, upper ring; 10, movable gap; 11, locking cylinder; 12, block. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] Example 1

[0032] like Figure 1 As shown, an isobaric autoclave comprises an autoclave body 1 and a lid body 2 inserted into the top of the autoclave body 1. The autoclave body 1 is cylindrical and vertically arranged, with a closed bottom and an open top. The lid body 2 is disc-shaped and inserted into the top opening of the autoclave body 1, forming a seal. The autoclave body 1 has a fixed base 3 on its outer surface, and a vertical column 4 is mounted on the fixed base 3 on one side of the autoclave body 1. A rotating arm 5, located above the autoclave body 1, is hingedly connected to the top of the column 4. One end of the rotating arm 5 is mounted on the top of the column 4 and can rotate horizontally. A lifting cylinder 6, connected to the lid body 2, is fixed to the middle of the rotating arm 5. The piston rod of the lifting cylinder 6 is vertically downward and fixedly connected to the lid body 2. A rotating cylinder 7 is connected between the rotating arm 5 and the column 4. One end of the rotating cylinder 7 is hingedly connected to the column 4, and the piston rod of the rotating cylinder 7 is hingedly connected to the rotating arm 5. Both the lifting cylinder 6 and the rotating cylinder 7 are linear hydraulic cylinders, and linear pneumatic cylinders can also be used in small isobaric autoclaves. A limiting column 8 opposite to the column 4 is provided on the other side of the fixed seat 3 and the kettle body 1, and the limiting column 8 is vertically arranged. A limiting rod 9 corresponding to the limiting column 8 is fixedly connected to the other end of the rotating arm 5, and the limiting rod 9 is vertically arranged.

[0033] like Figure 2 and Figure 3 As shown, the limiting column 8 is cylindrical, with a vertical insertion hole 8a on the top surface of the limiting column 8, and a notch 8b connected to the insertion hole 8a on the outer surface of the limiting column 8. The notch 8b faces the same direction as the movement of the limiting rod 9. When the rotating arm 5 rotates around the column 4, the bottom end of the limiting rod 9 can enter the insertion hole 8a through the notch 8b. Figure 4 and Figure 5 As shown, when the bottom end of the limiting rod 9 is inserted into the socket 8a, a clearance 10 is provided between the outer side of the bottom end of the limiting rod 9 and the wall surface of the socket 8a. The socket 8a is a blind cylindrical hole. The bottom end of the limiting rod 9 is cylindrical. The bottom end of the limiting rod 9 is inserted into the socket 8a, and a clearance 10 is provided between the outer side of the bottom end of the limiting rod 9 and the wall surface of the socket 8a. The two side walls of the limiting column 8 located at the notch 8b are vertically arranged and each is provided with a protruding protrusion 8c. The protrusion 8c is located above the notch 8b. The side of each protrusion 8c facing the other protrusion 8c is flat and vertically arranged. The outer side of each protrusion 8c is flat to reduce the acute angle at the protrusion 8c. The side of each protrusion 8c facing the other protrusion 8c transitions to the wall surface of the socket 8a through an arcuate surface. The bottom end of the limiting rod 9 has a cylindrical mating section 9a corresponding to the position of the protrusion 8c. The distance between the two protrusions 8c is smaller than the outer diameter of the mating section 9a. The protrusion 8c can undergo elastic deformation to allow the mating section 9a to pass through the two protrusions 8c and exit the socket 8a. The protrusion 8c can be a rubber block fixed to the limiting column 8; or the limiting column 8 is made of plastic. The gap between the two protrusions 8c is slightly smaller than the outer diameter of the mating section 9a, so that the protrusion 8c allows the mating section 9a to pass through the gap 8b when it undergoes elastic deformation. The distance between the two side walls of the limiting column 8 located below the gap 8b is equal to the aperture of the socket 8a. The outer surface of the bottom end of the limiting rod 9 has a protruding lower ring 9b located below the mating section 9a. The outer diameter of the lower ring 9b is smaller than the aperture of the socket 8a. The outer surface of the bottom end of the limiting rod 9 is located above the limiting column 8 and has a protruding upper ring 9c. The outer diameter of the upper ring 9c is larger than the aperture of the insertion hole 8a. There is a spacing distance between the bottom surface of the limiting rod 9 and the bottom surface of the insertion hole 8a.

[0034] like Figure 6 and Figure 7As shown, the outer surface of the lid 2 has a protruding positioning ring 2a. The outer side of the positioning ring 2a has a guide surface 2a1 that is conical and larger at the top and smaller at the bottom. The outer sides of the positioning ring 2a above and below the guide surface 2a1 are both cylindrical. A bottom fillet is provided between the bottom surface of the positioning ring 2a and the outer side of the positioning ring 2a. A top fillet is provided between the wall surface of the top opening of the cauldron 1 and the top surface of the cauldron 1. During insertion of the lid 2 into the cauldron 1, the bottom fillet and the top fillet contact each other, providing a guide, allowing the lid 2 to be adaptively aligned with the cauldron 1. The wall surface of the top opening of the cauldron 1 has a positioning surface 1a corresponding to the positioning ring 2a. The positioning surface 1a is conical and larger at the top and smaller at the bottom. The guide surface 2a1 has a greater taper than the positioning surface 1a, and the upper end of the guide surface 2a1 abuts against the center of the positioning surface 1a. A sealing ring is fixed to the outer surface of the positioning ring 2a, located below the guide surface 2a1. An annular slot 1b is provided on the wall surface of the hole at the top end of the kettle body 1, above the positioning surface 1a. A number of locking cylinders 11 arranged circumferentially are fixed on the cover body 2. The piston rod of each locking cylinder 11 faces radially outward and is fixed with a block 12, which can be inserted into the slot 1b.

[0035] When the cover body 2 is closed, the rotating cylinder 7 drives the rotating arm 5 to rotate so that the cover body 2 is located directly above the kettle body 1. The limiting rod 9 fixed on the rotating arm 5 moves synchronously, and the bottom end of the limiting rod 9 enters the socket 8a from the notch 8b of the limiting column 8. The limiting rod 9 is inserted in the socket 8a to have a limiting effect, which can prevent the rotating arm from deflecting after the rotating cylinder 7 is depressurized. Then the rotating cylinder 7 is depressurized, and the lifting cylinder 6 drives the cover body 2 to descend and insert into the kettle body 1. During the insertion process, since the rotating cylinder 7 has been depressurized and there is a movable gap 10 between the limiting rod 9 and the wall of the socket 8a, the cover body 2 can adaptively perform micro-movement to smoothly insert into place, and make the card block 12 smoothly align with the card slot 1b, and then the locking cylinder 11 is actuated to insert the card block 12 into the card slot 1b. When the lid 2 is opened, the locking cylinder 11 is actuated to disengage the clamping block 12 from the clamping slot 1b, and the lifting cylinder 6 drives the lid 2 to rise and disengage from the kettle body 1. Then, the rotating cylinder 7 applies pressure to drive the rotating arm 5 to rotate, causing the limiting rod 9 to pass through the notch 8b and disengage from the limiting column 8, and the lid 2 to move away from the kettle body 1. When the kettle body 1 is closed, the lid 2 of the present isobaric kettle can be smoothly inserted into place, and the clamping block 12 can be smoothly aligned and inserted into the clamping slot 1b.

[0036] Example 2

[0037] No protrusion 8c is provided at the notch 8b, and other structures are the same as those in the first embodiment.

[0038] Example 3

[0039] The limiting rod 9 is a split structure, and the matching section 9a is covered with a rubber sleeve, the inner diameter of the rubber sleeve is smaller than the distance between the two protrusions 8c, and the outer diameter of the rubber sleeve is larger than the distance between the two protrusions 8c. Other structures are the same as those in the first embodiment.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An isobaric kettle, comprising a kettle body (1) and a cover body (2) inserted into the top of the kettle body (1), a column (4) is provided on one side of the kettle body (1), a rotating arm (5) located above the kettle body (1) is hingedly connected to the column (4), a lifting cylinder (6) connected to the cover body (2) is fixed to the rotating arm (5), a rotating cylinder (7) is connected between the rotating arm (5) and the column (4), and the invention is characterized in that: A limiting column (8) is vertically arranged on the other side of the kettle body (1), and a limiting rod (9) corresponding to the limiting column (8) is fixedly connected to the rotating arm (5). A socket (8a) is provided on the top surface of the limiting column (8), and a notch (8b) connected to the socket (8a) is provided on the outer surface of the limiting column (8). When the rotating arm (5) rotates around the column (4), the bottom end of the limiting rod (9) can enter the socket (8a) through the notch (8b). When the bottom end of the limiting rod (9) is inserted into the socket (8a), the cover body (2) can be located directly above the kettle body (1) and a movable gap (10) is provided between the outer side surface of the bottom end of the limiting rod (9) and the hole wall of the socket (8a).

2. The isobaric autoclave according to claim 1, characterized in that The limiting column (8) is provided with protruding protrusions (8c) on the two side walls located at the notch (8b), and the bottom end of the limiting rod (9) has a cylindrical matching section (9a) corresponding to the position of the protrusion (8c). The distance between the two protrusions (8c) is smaller than the outer diameter of the matching section (9a). The protrusion (8c) and / or the matching section (9a) can undergo elastic deformation so that the matching section (9a) can enter and exit the insertion hole (8a) from between the two protrusions (8c).

3. The isobaric autoclave according to claim 2, characterized in that The socket (8a) is a cylindrical hole, the protrusion (8c) is located at the upper part of the notch (8b), the distance between the two side walls of the limiting column (8) located at the lower part of the notch (8b) is equal to the aperture of the socket (8a), and the outer surface of the bottom end of the limiting rod (9) is located below the matching section (9a) and has a protruding lower ring (9b), the outer diameter of the lower ring (9b) is smaller than the aperture of the socket (8a).

4. The isobaric autoclave according to claim 3, characterized in that The socket (8a) is a blind hole, and the outer surface of the bottom end of the limiting rod (9) is provided with a protruding upper ring (9c) located above the limiting column (8), the outer diameter of the upper ring (9c) is larger than the aperture of the socket (8a), and there is a spacing distance between the bottom surface of the limiting rod (9) and the bottom surface of the socket (8a).

5. The isobaric autoclave according to claim 2, characterized in that The socket (8a) and the limiting rod (9) are both arranged vertically, the side of each protrusion (8c) facing the other protrusion (8c) is flat and arranged vertically, and the side of each protrusion (8c) facing the other protrusion (8c) transitions to the hole wall surface of the socket (8a) in the form of an arc surface.

6. The isobaric autoclave according to any one of claims 1 to 5, characterized in that: The outer surface of the cover body (2) is provided with a protruding positioning ring (2a), and the outer side surface of the positioning ring (2a) has a guide surface (2a1) in the shape of a conical surface with a larger upper portion and a smaller lower portion.

7. The isobaric autoclave according to claim 6, characterized in that The hole wall surface of the top end opening of the kettle body (1) has a positioning surface (1a) corresponding to the positioning ring (2a), and the positioning surface (1a) is in the shape of a conical surface with a larger upper portion and a smaller lower portion. The taper of the guide surface (2a1) is greater than the taper of the positioning surface (1a), and the upper end of the guide surface (2a1) can abut against the middle of the positioning surface (1a).

8. The isobaric autoclave according to claim 7, characterized in that A clamping groove (1b) is provided on the wall surface of the hole at the top end of the kettle body (1) above the positioning surface (1a). A plurality of locking cylinders (11) arranged along the circumferential direction are fixed on the cover body (2). The piston rod of each locking cylinder (11) faces radially outward and is fixed with a clamping block (12). The clamping block (12) can be inserted into the clamping groove (1b).

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