Extruder seal structure

Abstract

The utility model provides an extruder sealing structure, effective solution avoided the uneven force of rubber cover in sealing process in prior art, the problem that the contact area between rubber cover and plunger rod needs to promote is easily worn out, its solution technical scheme is, including extruder main part, plunger rod and rubber cover on plunger rod, rubber cover outside is provided with fixed ring, and fixed ring is fixed on the main part, the rubber cover is covered with two gear rings, and two gear rings are in the same side of fixed ring, and gear ring rotation is installed on the main part, and the edge of fixed ring close to rubber cover is provided with the rope, and the gear ring that is far away from fixed ring is fixed with a plurality of pull ring corresponding with the rope, and one end of rope is connected with fixed ring fixedly, and the other end of rope passes through pull ring and returns to come and is connected with the gear ring close to fixed ring fixedly, when two gear rings reverse rotation, a plurality of ropes are tight rubber cover outside wall simultaneously and form net -like structure, so that rubber cover and plunger rod surface are close and form sealing structure.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to an extruder sealing structure. Background Technology

[0002] The filter screen in the extruder is mounted on the plunger, such as Figure 1 The diagram shows the installation of the plunger rod. When the filter screen needs to be replaced or cleaned, simply pull out the plunger rod. Existing patent document CN217123921U discloses a leak-proof structure for an extruder filter plunger rod. However, during use, because the rope is a single piece and wrapped multiple times, excessive localized force is applied to the rope, and the pressure exerted on the rubber sleeve during tightening is uneven. After a period of time, obvious marks and cracks appear in the center of the rubber sleeve. To solve the above problems, an extruder sealing structure is now provided. Utility Model Content

[0003] In view of the above situation and to overcome the defects of the prior art, this utility model provides an extruder sealing structure, which effectively solves the problems of uneven stress on the rubber sleeve and easy wear during the sealing process, and the need to improve the contact area between the rubber sleeve and the plunger rod in the prior art.

[0004] The technical solution includes an extruder body, a plunger rod, and a rubber sleeve on the plunger rod. A fixing ring is provided on the outer side of the rubber sleeve and is fixed to the body. Two toothed rings are fitted on the rubber sleeve, with the two toothed rings on the same side of the fixing ring. The toothed rings are rotatably mounted on the body. A rope is provided on the edge of the fixing ring near the rubber sleeve. Multiple pull rings corresponding to the ropes are fixed on the toothed rings farther away from the fixing ring. One end of the rope is connected and fixed to the fixing ring, and the other end of the rope passes through the pull ring and folds back to connect and fix to the toothed ring near the fixing ring. When the two toothed rings rotate in opposite directions, the multiple ropes simultaneously tighten the outer wall of the rubber sleeve to form a mesh structure, so that the rubber sleeve and the surface of the plunger rod are tightly attached to form a sealing structure.

[0005] Furthermore, there is a transmission gear between the two gear rings. The transmission gear is rotatably mounted on the main body, and the rotation of the transmission gear drives the two gear rings to rotate in opposite directions on the same axis.

[0006] Furthermore, the outer side of the main body has a worm gear mechanism, wherein the worm gear is coaxially fixed with the transmission gear, and the worm is rotatably mounted on the outer side of the main body.

[0007] Furthermore, the fixing ring has a pull ring through which the rope passes.

[0008] This invention features a clever structure that allows the ropes to apply pressure evenly around the rubber sleeve. The multiple ropes form a mesh-like structure, which greatly increases the contact area between the rubber sleeve and the plunger rod, further enhancing the sealing performance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the installation of the plunger rod and the main body in existing conventional technology.

[0010] Figure 2 This is the front sectional view of the present invention.

[0011] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0012] Figure 4 for Figure 3 View from direction B in the middle.

[0013] Figure 5 This is a diagram showing the initial state of the rope in this invention.

[0014] Figure 6 This is a schematic diagram showing how multiple ropes form a mesh structure when they tighten the rubber sleeve in this utility model. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0016] Depend on Figures 1 to 6 The present invention includes an extruder body 1, a plunger rod 2, and a rubber sleeve 3 on the plunger rod 2. A fixing ring 4 is provided on the outer side of the rubber sleeve 3 and is fixed to the body 1. Two toothed rings 5 ​​are fitted on the rubber sleeve 3, and the two toothed rings 5 ​​are located on the same side of the fixing ring 4. The toothed rings 5 ​​are rotatably mounted on the body 1. A rope 6 is provided on the edge of the fixing ring 4 near the rubber sleeve 3. Multiple pull rings 10 corresponding to the rope 6 are fixed on the toothed rings 5 ​​that are farther away from the fixing ring 4. One end of the rope 6 is connected and fixed to the fixing ring 4, and the other end of the rope 6 passes through the pull ring 10 and folds back to connect and fix to the toothed ring 5 near the fixing ring 4. When the two toothed rings 5 ​​rotate in opposite directions, the multiple ropes 6 simultaneously tighten the outer wall of the rubber sleeve 3 to form a mesh structure, so that the rubber sleeve 3 and the surface of the plunger rod 2 are tightly attached to form a sealing structure.

[0017] In order to enable the two gear rings 5 ​​to rotate in opposite directions on the same axis, there is a transmission gear 7 between the two gear rings 5. The transmission gear 7 is rotatably mounted on the main body 1. The rotation of the transmission gear 7 drives the two gear rings 5 ​​to rotate in opposite directions on the same axis.

[0018] To prevent the rope 6 from coming loose during extruder operation, the outer side of the main body 1 has a worm gear 8 and worm 9 mechanism, wherein the worm gear 8 is coaxially fixed with the transmission gear 7, and the worm 9 is rotatably mounted on the outer side of the main body 1.

[0019] It is worth noting that a bearing is installed between the gear ring 5 and the main body 1, and a bearing is installed between the central shaft of the transmission gear 7 and the main body 1.

[0020] When in use, the initial state of rope 6 is as follows: Figure 4 As shown, at this time, the rope 6 does not apply pressure to the rubber sleeve 3. The worm 9 is rotated, and the worm 9 drives the transmission gear 7 to rotate via the worm wheel 8. The transmission gear 7 drives the two gear rings 5 ​​to rotate in opposite directions on the same axis. At this time, the rope 6 gradually tightens, forming a mesh structure, as shown... Figure 5 As shown in the diagram, a sealing area is ultimately formed between the rubber sleeve 3 and the plunger rod 2, achieving a seal. When the screen needs to be replaced, the worm 9 is rotated in the opposite direction. The worm 9 drives the transmission gear 7 to rotate via the worm wheel 8, causing the two gears to gradually return to their original state, ultimately loosening the rubber sleeve 3 and facilitating the removal of the plunger rod 2.

[0021] This invention has a clever structure that allows the ropes to apply pressure evenly around the rubber sleeve 3. The multiple ropes form a mesh structure, which greatly increases the contact area between the rubber sleeve 3 and the plunger rod 2, further improving the sealing performance.

Claims

1. A sealing structure for an extruder, characterized in that, The extruder includes a main body (1), a plunger rod (2), and a rubber sleeve (3) on the plunger rod (2). A fixing ring (4) is provided on the outer side of the rubber sleeve (3), and the fixing ring (4) is fixed to the main body (1). Two toothed rings (5) are fitted on the rubber sleeve (3), and the two toothed rings (5) are located on the same side of the fixing ring (4). The toothed rings (5) are rotatably mounted on the main body (1). A rope (6) is provided on the edge of the fixing ring (4) near the rubber sleeve (3), and is spaced from the fixing ring (4). Multiple pull rings (10) corresponding to ropes (6) are fixed on the toothed ring (5) at the far end. One end of the rope (6) is connected and fixed to the fixed ring (4), and the other end of the rope (6) passes through the pull ring (10) and folds back to be connected and fixed to the toothed ring (5) near the fixed ring (4). When the two toothed rings (5) rotate in opposite directions, multiple ropes (6) simultaneously tighten the outer wall of the rubber sleeve (3) to form a mesh structure, so that the rubber sleeve (3) and the surface of the plunger rod (2) are tightly attached to form a sealing structure.

2. The extruder sealing structure according to claim 1, characterized in that, There is a transmission gear (7) between the two gear rings (5). The transmission gear (7) is rotatably mounted on the main body (1). The rotation of the transmission gear (7) drives the two gear rings (5) to rotate in opposite directions on the same axis.

3. The extruder sealing structure according to claim 1, characterized in that, The main body (1) has a worm gear (8) and worm (9) mechanism on the outside, wherein the worm gear (8) is fixed coaxially with the transmission gear (7), and the worm (9) is rotatably installed on the outside of the main body (1).

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