A disassembled screw press back pressure device

Abstract

This utility model discloses a detachable back pressure device for a screw press, relating to the technical field of screw press back pressure devices. It aims to solve the problems of unstable operation, difficult maintenance, and high frictional resistance in existing back pressure devices. The technical solution involves a mounting frame installed on the pressing equipment, with a sleeve and a cylinder connected to both ends of the frame. A connecting rod is slidably connected inside the sleeve, with one end of the connecting rod connected to a back pressure plate via a lock nut, and the other end connected to the telescopic end of the cylinder via a universal joint ball joint. By setting a universal joint ball joint between the cylinder and the connecting rod, the problem of unstable operation caused by misalignment between the back pressure plate and the screw shaft is effectively solved, ensuring smooth movement of the back pressure plate. Furthermore, the device significantly reduces noise and vibration during operation, significantly reduces the failure rate, and extends the service life of components. A conical ring is bolted onto the back pressure plate, and the conical ring corresponds to the position of the screw shaft in the pressing equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of back pressure device for screw presses, specifically a detachable back pressure device for screw presses. Background Technology

[0002] In pulp production, the screw press is a key piece of equipment for achieving efficient pulp dewatering and increasing pulp concentration. The back pressure device, as one of the core components of the screw press, directly affects the pressing effect and the continuity and stability of production.

[0003] The back pressure devices of commonly used screw presses for pulping currently on the market have the following problems:

[0004] Poor operational stability: During installation and long-term operation, the back pressure plate and the screw shaft are prone to misalignment, but there is a lack of effective compensation mechanism. This makes it easy for the back pressure plate to jam or tilt during movement, which reduces the uniformity of back pressure application, resulting in poor pulp pressing effect. It also aggravates the wear of parts, significantly shortens the service life of the equipment, and increases the frequency and cost of equipment maintenance.

[0005] High frictional resistance: During the reciprocating motion of the connecting rod, in order to transmit the thrust of the cylinder and overcome the reverse thrust of the material, the connecting rod also needs to overcome the frictional resistance with the inner wall of the sleeve, which consumes a lot of energy and will aggravate the damage of the connecting rod, thus affecting the matching accuracy of the two.

[0006] Maintenance is difficult and costly: Key components of the back pressure device, such as the wear-resistant parts on the back pressure plate, wear out quickly under the continuous squeezing and friction of the pulp. Most of the wear-resistant parts in the existing back pressure device are integral structures, and replacement requires disassembling a large number of peripheral parts, which is cumbersome and complicated, and requires a lot of manpower and time costs.

[0007] In summary, the existing screw press back pressure devices for pulp have many defects and cannot meet the demands of modern pulp production for efficient, stable, and precise pressing. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the existing defects and provide a detachable screw press back pressure device, which can effectively solve the problems in the background art.

[0009] To achieve the above objectives, this utility model discloses a detachable screw press back pressure device. The technical solution includes a back pressure plate, a sleeve, a mounting frame, and a cylinder. The mounting frame is installed on the pressing equipment, and the sleeve and the cylinder are respectively connected to both ends of the mounting frame.

[0010] A connecting rod is slidably connected inside the sleeve. One end of the connecting rod is connected to the back pressure plate through a lock nut, and the other end of the connecting rod is connected to the telescopic end of the cylinder through a universal joint ball joint.

[0011] By setting a universal joint ball joint between the cylinder and the connecting rod, the problem of unstable operation caused by the misalignment between the back pressure plate and the spiral shaft is effectively solved, ensuring the smooth movement of the back pressure plate. In addition, the noise and vibration of the device are significantly reduced during operation, the failure rate is significantly reduced, and the service life of the parts is extended.

[0012] A conical ring is bolted to the back pressure plate, and the conical ring corresponds to the position of the screw shaft in the pressing equipment.

[0013] As a preferred embodiment of this utility model, the mounting bracket is provided in two sets and is symmetrically installed on both sides of the spiral shaft.

[0014] As a preferred technical solution of this utility model, the mounting bracket includes a sleeve base and a cylinder base, the sleeve base and the cylinder base are connected by a screw and a nut, and a steel pipe is provided between the sleeve base and the cylinder base, the steel pipe being fitted onto the screw.

[0015] As a preferred technical solution of this utility model, the sleeve is further provided with a retaining ring and a linear bearing. The retaining ring and the linear bearing are both mounted on the connecting rod and play a guiding role for the connecting rod. By setting the linear bearing in the sleeve, the frictional resistance of the reciprocating motion of the connecting rod is reduced, so that the force of the cylinder can be transmitted to the back pressure plate more efficiently and energy loss is reduced.

[0016] As a preferred technical solution of this utility model, the cone ring adopts a split structure, including two sets of identical half rings. The two-half wear-resistant cone ring structure can be quickly disassembled, making the replacement of wear-resistant parts simple and quick, and greatly shortening the downtime of equipment maintenance.

[0017] As a preferred technical solution of this utility model, the back pressure plate and the cone ring are provided with a positioning pin and a convex ring on their facing surfaces, and the cone ring is provided with a pin hole and a ring groove that correspond to the position of the positioning pin and the convex ring and are adapted in size.

[0018] Compared with the prior art, the beneficial effects of this utility model are: by setting a universal joint ball joint between the cylinder and the connecting rod, this utility model effectively solves the problem of unstable operation caused by the misalignment of the back pressure plate and the spiral shaft, ensuring the smooth movement of the back pressure plate. Moreover, the noise and vibration of the device are significantly reduced during operation, the failure rate is significantly reduced, and the service life of the components is extended.

[0019] By installing a linear bearing inside the sleeve, the frictional resistance of the connecting rod's reciprocating motion is reduced, allowing the cylinder's force to be transmitted to the back pressure plate more efficiently, thus reducing energy loss.

[0020] The quick-release two-piece wear-resistant cone ring structure makes the replacement of wear-resistant parts simple and quick, greatly shortening the downtime for equipment maintenance. The time for replacing a wear-resistant cone ring has been reduced from 2-3 hours in traditional equipment to less than 30 minutes, significantly improving the continuity of production. The throttle valve, linear bearing and other components on the cylinder have relatively simple structures, making maintenance and upkeep convenient and reducing the maintenance cost of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the installation state of this utility model;

[0023] Figure 3 This is an exploded view of the present invention;

[0024] Figure 4 This is a partial sectional view of the present invention;

[0025] Figure 5 This is a partial exploded view of the present invention;

[0026] Figure 6 This is an exploded view of the mounting bracket of this utility model.

[0027] In the diagram: 1. Conical ring; 2. Back pressure plate; 3. Sleeve; 4. Anti-loosening nut; 5. Connecting rod; 6. Universal joint ball head; 7. Mounting bracket; 8. Cylinder; 9. Locating pin; 10. Retaining ring; 11. Linear bearing; 12. Pin hole; 13. Ring groove; 14. Convex ring; 15. Pressing equipment; 16. Bolt; 71. Sleeve base; 72. Cylinder base; 73. Steel pipe; 74. Screw; 75. Nut. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0029] like Figures 1 to 6 As shown, this utility model discloses a detachable screw press back pressure device, the technical solution of which includes:

[0030] Conical ring 1: a split structure, detachably mounted on the back pressure plate 2, used to squeeze the slurry and provide guidance for the slurry;

[0031] Back pressure plate 2: used to drive cone ring 1 to press the material;

[0032] Sleeve 3: Fixed to the housing, providing a stable foundation for the entire back pressure device;

[0033] Anti-loosening nut 4: Prevents vibration caused by the reciprocating motion of connecting rod 5 from affecting the tight connection with back pressure plate 2;

[0034] Link 5: Used to transmit the thrust of cylinder 8, provide guidance for back pressure plate 2, support back pressure plate 2, control the gap between back pressure plate 2 and screw shaft, thereby controlling the pressing effect;

[0035] Universal joint ball joint 6: Used to compensate for angular deviation and avoid transmission interruption caused by the non-collinearity of the connecting rod 5 and cylinder 8 axis;

[0036] Cylinder 8: Power source. The movement of the extension and retraction end of cylinder 8 is achieved through the electrical signal of cylinder 8, thereby driving the movement of back pressure plate 2 to achieve the extrusion and dehydration of materials.

[0037] Positioning pin 9: Used to assist in positioning the two halves of the cone ring 1, facilitating the installation of the cone ring 1;

[0038] 10 retaining ring: positions the linear bearing 11 and prevents the linear bearing 11 from moving along the axial direction;

[0039] Linear bearing 11: guides the connecting rod 5 to perform linear motion, ensuring the smoothness and accuracy of the motion; at the same time, it reduces the frictional resistance between the connecting rod 5 and the sleeve 3.

[0040] Screw 74: Used to connect cylinder 8 and sleeve 3;

[0041] Steel pipe 73: used to set the distance between cylinder base 72 and sleeve base 71, and to adjust the stroke of cylinder 8;

[0042] The mounting frame 7 is installed on the pressing equipment 15, and the sleeve 3 and the cylinder 8 are respectively connected to both ends of the mounting frame 7;

[0043] The mounting bracket 7 is provided in two sets and is symmetrically installed on both sides of the spiral shaft.

[0044] The mounting bracket 7 includes a sleeve base 71 and a cylinder base 72. The sleeve base 71 and the cylinder base 72 are connected by a screw 74 and a nut 75. A steel pipe 73 is also provided between the sleeve base 71 and the cylinder base 72. The steel pipe 73 is fitted onto the screw 74.

[0045] A connecting rod 5 is slidably connected inside the sleeve 3, and one end of the connecting rod 5 is connected to the back pressure plate 2 via a lock nut 4.

[0046] Under the action of the connecting rod 5, the back pressure plate 2 will vibrate. In addition, the frequent reciprocating motion requires a high degree of tightness between the back pressure plate 2 and the connecting rod 5. Furthermore, the connecting rod 5 also supports the back pressure plate 2, which will further affect the gap between the back pressure plate 2 and the screw shaft. Therefore, the back pressure plate 2 and the connecting rod 5 are locked by using the anti-loosening nut 4, and a cotter pin is provided at the end of the connecting rod 5 to limit the failure of the anti-loosening nut 4 or the loosening caused by a huge impact.

[0047] The other end of the connecting rod 5 is connected to the telescopic end of the cylinder 8 via a universal joint ball joint 6;

[0048] During actual installation or long-term operation, the back pressure plate 2 and the screw shaft cannot be guaranteed to be concentric. When the gap between the back pressure plate 2 and the screw shaft is too large, pulp leakage is likely to occur, affecting the pressing effect. Conversely, the back pressure plate 2 and the screw shaft are prone to rubbing against each other, which can easily damage the screw shaft and the back pressure plate 2, thus affecting normal production. Furthermore, since the connecting rod 5 is connected to the back pressure plate 2, the axis of the connecting rod 5 and the cylinder 8 is prone to misalignment. In this case, the connecting rod 5 will bear a lot of force, and the connecting rod 5 is prone to breakage. To compensate for this misalignment, the cylinder 8 and the connecting rod 5 are connected by a universal joint ball joint 6, which can ensure the durability of each component, enable multi-directional movement, and also buffer vibration and impact, avoiding power damage or movement deviation caused by angle changes.

[0049] The sleeve 3 is also provided with a retaining ring 10 and a linear bearing 11. The retaining ring 10 and the linear bearing 11 are both fitted on the connecting rod 5 and play a guiding role for the connecting rod 5.

[0050] During the production process, the connecting rod 5 frequently reciprocates. The large friction between the connecting rod 5 and the sleeve 3 will hinder the normal movement of the connecting rod 5, which will aggravate the wear of the connecting rod 5. To overcome this frictional resistance, a linear bearing 11 is provided between the connecting rod 5 and the sleeve 3, which can greatly reduce maintenance time and cost.

[0051] The linear bearing 11 is installed inside the sleeve 3. One end is limited by the sleeve shoulder, and the other end is limited by the retaining ring 10. The retaining ring 10 is made of wear-resistant material, which can reduce the wear of parts. A groove is opened in the sleeve 3, and an elastic retaining ring is inserted into the hole to limit the retaining ring 10 and prevent the linear bearing 11 from moving along the axial direction.

[0052] A conical ring 1 is installed on the back pressure plate 2 by bolts 16, and the conical ring 1 corresponds to the position of the screw shaft in the pressing equipment 15.

[0053] The conical ring 1 adopts a split structure, including two sets of identical semi-rings.

[0054] Conical ring 1 is a key component used to squeeze and dehydrate materials. After long-term operation, conical ring 1 will be subjected to material squeezing and friction. The replacement cycle of conical ring 1 is very short. While using high wear-resistant materials, conical ring 1 is designed as a left and right half structure, that is, conical ring 1 is two semi-circular shapes, which can realize the quick disassembly and installation of conical ring 1, greatly improving maintenance efficiency.

[0055] The back pressure plate 2 and the cone ring 1 are provided with a positioning pin 9 and a convex ring 14 on their facing surfaces. The cone ring 1 is provided with a pin hole 12 and an annular groove 13 that correspond to the position of the positioning pin 9 and the convex ring 14 and are adapted in size.

[0056] The conical ring 1 is mounted on the back pressure plate 2. In order to ensure that the back pressure plate 2 and the conical ring 1 are concentric, a convex ring 14 is provided on the back pressure plate 2. The conical ring 1 has an annular groove 13 and is set with a high machining precision. This can further realize the uniform extrusion of materials. In addition, the back pressure plate 2 has a positioning pin 9, which makes the installation of the conical ring 1 and the back pressure plate 2 more convenient.

[0057] The working principle of this utility model:

[0058] During operation, both sets of cylinders 8 are simultaneously inlet air. Under the control of the throttle valve, the telescopic ends of cylinders 8 slowly extend in a linear motion. The telescopic ends of cylinders 8 transmit force to connecting rod 5 through universal joint ball joint 6. Connecting rod 5 passes through sleeve 3, linear bearing 11, retaining ring 10, and back pressure plate 2, driving back pressure plate 2 to move towards the material outlet until the conical ring 1 on back pressure plate 2 contacts the material, generating back pressure and squeezing the material. The material continuously enters the material plug tube, and after plugging, it pushes the conical ring 1, causing back pressure plate 2 and connecting rod 5 to move in the opposite direction. When the material accumulates to a certain extent, it pushes open the conical ring 1, and the material falls from the gap into the collection tank. Depending on the characteristics of the material, the quality of the material can be improved by adjusting the pressure of cylinder 8 to affect the back pressure of back pressure plate 2.

[0059] The circuits and mechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. They are common knowledge.

[0060] Components not described in detail in this article are existing technologies.

[0061] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A back pressure device for a screw press, the device being characterized by: Includes a back pressure plate (2), a sleeve (3), a mounting bracket (7) and a cylinder (8). The mounting bracket (7) is installed on the pressing equipment (15), and the sleeve (3) and the cylinder (8) are respectively connected to both ends of the mounting bracket (7). A connecting rod (5) is slidably connected inside the sleeve (3). One end of the connecting rod (5) is connected to the back pressure plate (2) through a lock nut (4). The other end of the connecting rod (5) is connected to the telescopic end of the cylinder (8) through a universal joint ball joint (6). A conical ring (1) is installed on the back pressure plate (2) by bolts (16), and the conical ring (1) corresponds to the position of the screw shaft in the pressing equipment (15).

2. The detachable screw press back pressure device according to claim 1, characterized in that: The mounting bracket (7) is provided in two sets and is symmetrically installed on both sides of the spiral shaft.

3. A detachable screw press back pressure device according to claim 1 or 2, characterized in that: The mounting bracket (7) includes a sleeve base (71) and a cylinder base (72). The sleeve base (71) and the cylinder base (72) are connected by a screw (74) and a nut (75). A steel pipe (73) is also provided between the sleeve base (71) and the cylinder base (72). The steel pipe (73) is fitted on the screw (74).

4. A detachable screw press back pressure device according to claim 1 or 2, characterized in that: The sleeve (3) is also provided with a retaining ring (10) and a linear bearing (11). The retaining ring (10) and the linear bearing (11) are both mounted on the connecting rod (5) and play a guiding role for the connecting rod (5).

5. The detachable screw press back pressure device according to claim 1, characterized in that: The conical ring (1) adopts a split structure, including two sets of semi-rings with the same structure.

6. The detachable screw press back pressure device according to claim 5, characterized in that: The back pressure plate (2) and the cone ring (1) are provided with a positioning pin (9) and a convex ring (14) on their facing surfaces. The cone ring (1) is provided with a pin hole (12) and a ring groove (13) that correspond to the position of the positioning pin (9) and the convex ring (14) and are adapted to the size.

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