A small screw press

Abstract

The utility model provides a small -size screw rod oil press, and technical key points include: tubular press hole and press bar that coaxially is arranged in press hole, press bar has the stress section that protrudes the press hole tail end in axial direction, stress section has the limiting part that is in abutment with press hole to limit press bar axial displacement and can axial adjustment limiting position, still movably clamps the thrust bearing that is used for reducing the frictional force of rotation between limiting part and press hole, the wall of press hole is close to tail end and has the slag hole of radial slagging. Only need to adjust the axial limiting position of limiting part, can adjust the clearance between press bar and press hole, not only can be applicable to different oil material, but also can make up the clearance that increases because of abrasion, prolongs the life. The axial stress between press bar and press hole is mutually offset during pressing and can reach dynamic balance, not only can save the structure for fixed press hole or press bar, but also the load requirement of motor is lower, has reduced the cost, and the dismounting and cleaning are very simple.

Description

Technical Field

[0001] This utility model relates to the field of oil press technology, specifically to a small screw oil press. Background Technology

[0002] In existing screw oil presses, especially small household or commercial oil presses, the oilseeds are squeezed by the pressing rods inside the pressing chamber. The oil flows out from the oil outlet at the bottom of the middle to rear section of the pressing chamber, while the oil residue is discharged from the gap between the pressing chamber and the pressing rods at the rear end. This pressing mechanism has several problems: 1. The pressed oil residue is usually dry and hard, which will cause wear by rubbing against the walls of the pressing chamber and the pressing rods. Wear will lead to insufficient pressure inside the pressing chamber, thereby reducing the oil yield. However, the existing pressing mechanism does not have a good solution. Replacing the pressing rods is costly and complicated, and using materials with wear resistance has limited effectiveness and is also costly. 2. During the pressing process, the oilseeds generate significant axial forces on both the pressing chamber and the pressing rod. On one hand, the motor needs to withstand the enormous axial thrust of the pressing rod towards the front. Therefore, in addition to installing bearings and bearing seats between the front end of the pressing rod and the frame to distribute this axial force, the required motor configuration is also high, leading to higher equipment costs. On the other hand, the front end of the pressing chamber needs to be fixed to the mounting sleeve of the frame using pins or other structures to prevent the pressing chamber from detaching axially towards the rear end. However, the axial force on the pressing chamber is very large, which may even damage the mounting sleeve. Existing pressing mechanisms not only require complex structures to limit the pressing chamber and pressing rod, but also require reversing the pressing rod to unload the material during cleaning, then removing the pins that lock the pressing chamber to disassemble the pressing chamber, and finally disassembling the pressing rod and bearings, making disassembly and assembly very inconvenient. Furthermore, a large amount of heat from the pressing rod is conducted to the front end of the bearing, causing bearing lubricating oil and wear metal filings to enter the pressing chamber and contaminate the oilseeds. 3. When the oil residue is discharged from the tail end, the occasional air trapped in the pressing chamber can cause high-temperature oil to be sprayed axially from the residue outlet, which poses a certain safety hazard.

[0003] Chinese utility model patent CN 204431768 U discloses a pressing chamber structure for an oil press. A bearing is fixed to the end of the pressing chamber, and the end of the pressing rod passes through the bearing and is connected to a limiting device. This limiting device is tightly attached to the end face of the bearing away from the pressing rod. While this structure can reduce the load on the motor and isolate the pressing rod from the pressing chamber through the bearing, reducing contact wear, it has several problems: Firstly, the bearing is embedded and fixed to the inner wall of the pressing chamber. Secondly, the opposing force between the pressing rod and the pressing chamber during pressing is very large, making it difficult to fix the outer ring of the bearing, which often loosens towards the tail end. This necessitates fixing the pressing chamber to the frame; otherwise, the pressing chamber may fly out axially, causing an accident. Thirdly, the pressing rod is restricted by the outer ring of the bearing and cannot be removed from the tail end, making disassembly and cleaning inconvenient. Finally, the wear between the pressing chamber and the pressing rod is mainly caused by friction from the oil residue; even with the bearing positioning the pressing rod, wear will still occur. Utility Model Content

[0004] The purpose of this invention is to provide a small screw oil press that can solve wear problems, is easy to disassemble and clean, has a simplified structure, and is safe and reliable.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A small screw oil press includes a motor, a mounting plate vertically disposed behind the output shaft of the motor, a mounting sleeve fixed to the rear side of the mounting plate and concentrically disposed with respect to the output shaft of the motor, a tubular pressing chamber whose front end is inserted into the mounting sleeve and restricted from rotating around the shaft, and a pressing rod coaxially disposed within the pressing chamber and driven by the motor to rotate around the shaft; the pressing rod includes a shaft core with a diameter gradually increasing from the front end to the rear end, and spiral blades axially wound around the shaft core and distributed thereon with an outer diameter adapted to the inner diameter of the pressing chamber. The front end of the pressing rod has an insertion section that passes through the mounting plate and is axially and movably inserted into the output shaft of the motor. The pressing rod also has a force-bearing section that extends axially from the tail end of the pressing chamber. The force-bearing section is provided with a limiting member that abuts against the tail end of the pressing chamber to limit the axial forward movement of the pressing rod. The limiting member can be adjusted in position along the axial direction of the force-bearing section. A thrust bearing for reducing rotational friction is also sandwiched between the limiting member and the tail end of the pressing chamber. The wall of the pressing chamber near the tail end also has a radial slag discharge hole.

[0007] In a preferred embodiment, the limiting member is an adjusting nut that engages with the force-bearing section via a thread.

[0008] In a preferred embodiment, the adjusting nut is radially perforated with a locking screw that secures it to the force-bearing section.

[0009] In a preferred embodiment, the limiting member includes a plurality of washers fitted onto the force-bearing section, and a retaining ring or pin that limits the movement of the washers toward the tail end of the force-bearing section.

[0010] In a preferred embodiment, the front end of the pressing chamber and the mounting sleeve have a matching limiting plane for restricting relative rotation, and the limiting plane is provided with a feed inlet.

[0011] In a preferred embodiment, the pressing chamber and the mounting sleeve are further secured by a pin.

[0012] In a preferred embodiment, the easily worn section at the tail end of the pressing chamber is a detachable section, which is fixed to the pressing chamber by threads.

[0013] In a preferred embodiment, the slag discharge holes are a plurality of elongated holes extending circumferentially and evenly distributed around the peripheral wall of the pressing chamber.

[0014] Its beneficial effects are as follows: 1. Since the pressing rod is movably inserted into the output shaft of the motor, in the stopped state, the pressing rod can move back and forth axially. In the working state, both the pressing chamber and the pressing rod are subjected to the opposing forces of the pressed material. These opposing forces are equal in magnitude and opposite in direction in the axial direction. Specifically, the spiral blades of the pressing rod are subjected to the axial forward thrust of the material, while the pressing chamber is subjected to the axial backward thrust of the material. The pressing rod, through the limiting component, abuts against the tail end of the pressing chamber, thus achieving mutual cancellation of the axial forces of the two materials. This allows the pressing chamber and the pressing rod to maintain dynamic balance in the axial direction. Therefore, neither the pressing chamber nor the pressing rod needs to be fixedly installed in the axial direction. Since the forces on the pressing chamber and the pressing rod in the axial direction are mutually cancelled, not only can the structure used in the prior art to forcefully fix the pressing chamber to prevent it from flying out axially and backward be eliminated, but the pressing rod will not exert axial forward pressure on the motor. 1. Reduces the load on the motor, saves motor costs and extends its service life. Furthermore, disassembly and cleaning are very simple; the pressing rod and pressing chamber can be removed axially. 2. When the axial limiting position of the fine-tuning limiter is adjusted, the relative axial position of the pressing chamber and pressing rod can be adjusted. Since the diameter of the shaft core gradually increases from the front end to the rear end, adjusting the position of the pressing rod can adjust the gap between the outer wall of the shaft core and the inner wall of the pressing chamber at the pressing position. This not only adjusts the pressing pressure to suit oils with different properties, but also compensates for the increased gap at the pressing position due to wear by adjusting the pressing rod position, easily solving the problem of wear between the pressing chamber and the pressing rod, ensuring oil yield and extending service life. 3. Radial slag discharge from the slag outlet can automatically cut off the oil slag. Compared with the existing technology of slag discharge from the rear end, there is no need to set up a separate slag scraping structure, and it can also prevent axial oil spraying, eliminating safety hazards. 4. Since the thrust bearing is located at the rear end of the pressing rod, its lubricating oil and wear metal filings will not enter the pressing chamber in reverse and contaminate the oil. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the oil press in the embodiment;

[0017] Figure 2 This is a schematic diagram of the assembly structure of the press rod and the press chamber in the embodiment. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] refer to Figure 1 and Figure 2The small screw oil press of this embodiment includes a motor 2, a frame 1 for accommodating and mounting the motor 2, a mounting plate 11 vertically disposed behind the output shaft 21 of the motor 2, a mounting sleeve 3 concentrically disposed on the rear side of the mounting plate 11 and the motor 2 output shaft 21, a tubular pressing chamber 4 whose front end is inserted into the mounting sleeve 3 and is restricted from rotating around the shaft, and a pressing rod 5 coaxially disposed in the pressing chamber 4 and driven by the motor 2 to rotate around the shaft. The pressing rod 5 includes a shaft core 51 with a diameter that gradually increases from the front end to the rear end, and spiral blades 52 that are axially wound around the shaft core 51 and whose outer diameter matches the inner diameter of the pressing chamber 4. The front end of the pressing rod 5 has a plug-in section 53 that passes through the mounting plate 11 and is axially movably inserted into the output shaft 21 of the motor 2. Specifically, the plug-in section 53 can be polygonal, adapted to be inserted into the output shaft 21 of the motor 2, and can be removed along the axis. Of course, the plug-in section 53 can also be flat. The shaft and other structures; the pressing rod 5 also has a force-bearing section 54 extending axially from the tail end of the pressing chamber 4, the force-bearing section 54 is provided with a limiting member 55 that abuts against the tail end of the pressing chamber 4 to limit the axial forward movement of the pressing rod 5, and the limiting member 55 can be adjusted in position along the axial direction of the force-bearing section 54, and a thrust bearing 56 for reducing rotational friction is also sandwiched between the limiting member 55 and the tail end of the pressing chamber 4; the wall of the pressing chamber 4 near the tail end also has a radial slag discharge hole 41.

[0020] Since the pressing rod 5 is movably inserted onto the output shaft 21 of the motor 2, in the stopped state, the pressing rod 5 can move back and forth axially. In the working state, both the pressing chamber 4 and the pressing rod 5 are subjected to a reverse force from the pressed material. These reverse forces are equal in magnitude and opposite in direction axially. Specifically, the spiral blades 52 of the pressing rod 5 are subjected to a forward axial thrust from the material, while the pressing chamber 4 is subjected to a backward axial thrust from the material. The pressing rod 5, through the limiting member 55 abutting against the tail end of the pressing chamber 4, achieves mutual cancellation of the axial forces on both, thus... The pressing chamber 4 and the pressing rod 5 are dynamically balanced in the axial direction. Therefore, neither the pressing chamber 4 nor the pressing rod 5 needs to be fixed in the axial direction. Since the forces on the pressing chamber 4 and the pressing rod 5 in the axial direction are canceled out, the structure used in the prior art to forcefully fix the pressing chamber 4 to prevent it from flying out axially can be eliminated. Moreover, the pressing rod 5 will not exert axial forward pressure on the motor 2, which can reduce the load requirements on the motor 2, save the cost of the motor 2 and extend its service life. In addition, disassembly and cleaning are very simple. The pressing rod 5 and the pressing chamber 4 can be removed axially. When the axial limiting position of the fine-tuning limiting component 55 is adjusted, the axial relative position of the pressing chamber 4 and the pressing rod 5 can be adjusted. Since the diameter of the shaft core 51 gradually increases from the front end to the tail end, adjusting the position of the pressing rod 5 can adjust the gap between the outer wall of the shaft core 51 and the inner wall of the pressing chamber 4 at the pressing position. This not only adjusts the pressing pressure to suit oils with different properties, but also compensates for the increased gap at the pressing position due to wear by adjusting the position of the pressing rod 5, easily solving the problem of wear between the pressing chamber 4 and the pressing rod 5, ensuring oil yield and extending service life. The slag discharge hole 41 discharges slag radially, which can automatically cut off the oil slag. Compared with the existing technology of slag discharge from the tail end, there is no need to set up a separate slag scraping structure, and it can also block the axial spray of oil, eliminating safety hazards. Since the thrust bearing 56 is located at the tail end of the pressing rod 5, its lubricating oil and wear iron filings will not enter the pressing chamber 4 in reverse and contaminate the oil.

[0021] In this embodiment, the limiting member 55 is an adjusting nut that is threadedly engaged with the force-bearing section 54. The axial position of the limiting member 55 on the force-bearing section 54 can be adjusted by rotating the adjusting nut. For example, moving the pressing rod 5 towards the tail end increases the gap between the pressing chamber 4 and the pressing rod 5, while moving the pressing rod 5 towards the front end decreases the gap. The adjusting nut is easy to adjust. Furthermore, a locking screw 551 is radially inserted through the adjusting nut to fix it to the force-bearing section 54. The locking screw 551 effectively prevents the adjusting nut from loosening. In another embodiment, the limiting member 55 includes several washers fitted onto the force-bearing section 54, and a retaining ring or pin that limits the movement of the washers towards the tail end of the force-bearing section 54. Snap rings or pins are used for limiting the position, while washers are used for axial adjustment of the limiting position. For example, after removing a washer, the pressing rod 5 will move a certain distance to the front end, which reduces the gap between the pressing rod 5 shaft core 51 and the inner wall of the pressing chamber 4 at the pressing position. Similarly, adding washers will increase the gap.

[0022] In this embodiment, a matching limiting plane 42 for restricting relative rotation is provided between the front end of the pressing chamber 4 and the mounting sleeve 3. The limiting plane 42 is provided with a feed inlet 43, which is connected to the bottom end of the hopper 6. The limiting plane 42 can restrict the pressing chamber 4 from rotating around the axis. It has a simple structure, and the feed inlet 43 is conveniently provided on the limiting plane 42.

[0023] In this embodiment, the pressing chamber 4 and the mounting sleeve 3 are further fixed by a pin 31. Since the mounting sleeve 3 is only used to stabilize the pressing chamber 4 and restrict its relative rotation, the pressing chamber 4 is not subjected to axial rearward force. However, by adding the pin 31 to fix the pressing chamber 4 to the mounting sleeve 3, it is possible to avoid the pressing chamber 4 from loosening outward due to collisions during operation, thereby improving the reliability of the equipment.

[0024] In this embodiment, the easily worn section at the tail end of the pressing chamber 4 is a detachable section 400, which is fixed to the pressing chamber 4 by threads. The pressing position of the oil press is located on the detachable section 400 of the pressing chamber 4. When the pressing position is severely worn, the detachable section 400 can be removed and replaced, thereby further extending the service life of the oil press.

[0025] In this embodiment, the slag discharge hole 41 is a plurality of elongated holes extending circumferentially and evenly distributed around the circumferential wall of the pressing chamber 4. The circumferentially distributed elongated holes can better dissipate heat and prevent heat from being conducted to the thrust bearing 56.

[0026] The above description does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A compact screw press for oil extraction, characterized in that: The device includes a motor, a mounting plate vertically positioned behind the output shaft of the motor, a mounting sleeve fixed to the rear side of the mounting plate and concentrically arranged with the output shaft of the motor, a tubular pressing chamber with its front end inserted into the mounting sleeve and restricted from rotating around the shaft, and a pressing rod coaxially inserted into the pressing chamber and driven by the motor to rotate around the shaft; the pressing rod includes a shaft core with a diameter gradually increasing from the front end to the rear end, and spiral blades axially wound around the shaft core with an outer diameter adapted to the inner diameter of the pressing chamber. The front end of the press rod has a plug-in section that passes through the mounting plate and is axially and movably plugged into the output shaft of the motor. The press rod also has a force-bearing section that extends axially from the tail end of the press chamber. The force-bearing section is provided with a limiting member that abuts against the tail end of the press chamber to limit the axial forward movement of the press rod. The limiting member can be adjusted in position along the axial direction of the force-bearing section. A thrust bearing for reducing rotational friction is also sandwiched between the limiting member and the tail end of the press chamber. The wall of the press chamber near the tail end also has a radial slag discharge hole.

2. A compact screw press according to claim 1, characterized in that: The limiting component is an adjusting nut that is threadedly engaged with the force-bearing section.

3. A compact screw press according to claim 2, characterized in that: The adjusting nut is radially fitted with a locking screw that secures it to the force-bearing section.

4. A compact screw press according to claim 1, characterized in that: The limiting component includes a plurality of washers fitted onto the force-bearing section, and a snap ring or pin that limits the movement of the washers toward the tail end of the force-bearing section.

5. A compact screw press according to claim 1, characterized in that: The front end of the pressing chamber and the mounting sleeve have a matching limiting plane for limiting relative rotation, and the limiting plane is provided with a feed inlet.

6. A compact screw press according to claim 5, characterized in that: The pressing chamber and the mounting sleeve are also fixed by a pin.

7. A small screw oil press according to claim 1, characterized in that: The section at the end of the pressing chamber that is prone to wear is a detachable section, which is fixed to the pressing chamber by threads.

8. A compact screw press according to claim 1, characterized in that: The slag discharge holes are a number of elongated holes that extend circumferentially and are evenly distributed around the periphery of the pressing chamber.

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