Screw adjusting and disassembling structure of plastic extruder

Abstract

A screw adjusting and detaching structure of a plastic extruder comprises a machine barrel and a screw, an output shaft sleeve coaxial with the screw is arranged in a transmission box in a penetrating mode, the tail end of the output shaft sleeve is in threaded connection with a fixing nut, an adjusting sleeve is arranged in an inner hole of the output shaft sleeve, and the handle portion of the screw is inserted into an inner hole of the adjusting sleeve to be fixed. The tail portion of the adjusting sleeve extends out of the output sleeve, a long external thread is formed on the tail portion, the adjusting nut is arranged on the tail portion of the adjusting sleeve in a sleeved mode, abuts against the rear end of the output shaft sleeve and is pressed through the fixing nut, the adjusting sleeve is arranged in the output shaft sleeve in a front-back moving mode through forward and reverse rotation of the adjusting nut, and then adjustment of the screw rod is achieved. The screw rod adjusting device is simple and reasonable in structure and convenient to operate, the screw rod can be adjusted by rotating the adjusting nut, meanwhile, the screw rod can be disassembled and assembled in the state that the transmission case, the machine barrel and the discharging runner are fixed, and the screw rod adjusting device is convenient and reliable to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of polymer material processing machinery and relates to a screw adjustment and disassembly structure of a plastic extruder. Background Art

[0002] The extruder is used to fully mix and extrude a variety of granular raw materials and then output them. It is mainly used in the field of plastic or rubber manufacturing. When working, the extruder heats the raw materials to make them viscous and flow, and under pressure, makes them pass through a die with a certain shape, and become a continuum with a cross-section similar to the shape of the die. Then, through cooling, the raw materials with a certain geometric shape and size are changed from a viscous flow state to a highly elastic state, and finally cooled and shaped into a glass state to obtain the desired product.

[0003] Conventional plastic extruders require a dedicated transmission box. In addition to the conventional speed reduction gear set, the output end of the transmission box is equipped with an additional thrust bearing to bear the working recoil of the screw. The conventional structure is that the transmission box is fixed and no longer moves. The installation and removal of the screw need to enter and exit from the barrel outlet, so it is necessary to disassemble the discharge channel and flange. In some special cases, when the discharge channel of the extruder cannot be disassembled and the entire extruder is not convenient to move, it is necessary to move the transmission box, etc., and it will be troublesome to disassemble and install the screw. If the screw can be pulled out from the back of the transmission box, it will be convenient to install and remove the screw.

[0004] Since the screw of a conventional plastic extruder cannot move axially after being installed in the transmission box, the gap distance between the screw head and the discharge channel is fixed. At this time, if you want to adjust the gap distance between the screw head and the discharge channel, you need to change the size of the discharge channel or add a gasket, etc., which is very troublesome. A small gap distance between the screw head and the discharge channel can increase the discharge pressure, and a large gap distance can increase the storage space to stabilize the pressure fluctuation. For a small experimental extruder, the gap distance between the screw head and the discharge channel can be adjusted at any time, which can make it more convenient to test various data. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a screw adjustment and disassembly structure of a plastic extruder with simple and reasonable structure and convenient operation in view of the above-mentioned technical status quo, which can adjust and disassemble the screw while the transmission box, barrel and discharge flow channel are fixed.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a screw adjustment and disassembly structure of a plastic extruder, comprising a barrel and a screw, the screw is arranged in the barrel, the discharge port of the barrel is fixedly connected to the discharge flow channel through a flange, and a transmission box is fixed on a frame and fixedly connected to the flange at the other end of the barrel, characterized in that: an output shaft sleeve coaxial with the screw is provided through the transmission box, a fixing nut is threadedly connected to the tail end of the output shaft sleeve, a detachable adjusting sleeve is provided in the inner hole of the output shaft sleeve, the handle of the screw is inserted in the inner hole of the adjusting sleeve and fixed, the tail of the adjusting sleeve extends out of the output sleeve, and a long external thread is formed at the tail, a matching adjusting nut is sleeved on the tail of the adjusting sleeve, abuts against the rear end of the output shaft sleeve, and is tightened by the fixing nut, the outer end of the adjusting nut extends out of the fixing nut, and the adjusting sleeve can be moved forward and backward through the positive and negative rotation of the adjusting nut and is arranged in the output shaft sleeve, thereby realizing the adjustment of the screw.

[0007] As an improvement, the inner hole wall of the output sleeve is provided with a keyway, the tail end is processed with an external thread, the fixing nut is sleeved on the tail end of the output sleeve, the outer diameter of the adjusting sleeve matches the inner hole of the output sleeve, the outer surface of the adjusting sleeve is provided with a keyway, and matches with the keyway of the output sleeve through a key block.

[0008] Furthermore, the rear end handle of the screw is installed at the front end position of the inner hole of the adjusting sleeve, a screw pull rod is inserted into the adjusting sleeve and connected to the screw handle, and the screw and the adjusting sleeve are positioned to form a whole through a nut gasket.

[0009] Furthermore, the inner hole of the adjusting sleeve is a stepped hole with a larger front end and a smaller rear end, wherein the diameter of the screw shank matches the front end inner hole of the adjusting sleeve, and the diameter of the screw pull rod matches the rear end inner hole of the adjusting sleeve.

[0010] Furthermore, the adjusting nut is a T-shaped nut with an expanding convex ring at one end, and the fixing nut is a nut with large and small holes. The diameter of the convex ring of the adjusting nut is consistent with the outer diameter of the output shaft sleeve. During installation, the adjusting nut is sleeved on the tail of the adjusting sleeve, and the screw and the adjusting sleeve are inserted into the inner hole of the output shaft sleeve from the rear end of the transmission box, and the adjusting nut is tightened and fixed by the fixing nut.

[0011] Finally, thrust bearings are installed outside the output end and output shaft sleeve of the transmission box.

[0012] Compared with the prior art, the utility model has the advantages that: an adjusting sleeve is added to the output shaft sleeve of the transmission box, the front end of the adjusting sleeve is connected to the screw, and the rear end is provided with an adjusting nut and fixed by a fixing nut, and the adjusting sleeve is moved forward and backward in the transmission box by the forward and reverse rotation of the adjusting nut, thereby driving the screw to move forward and backward, thereby adjusting the gap distance between the screw head and the discharge flow channel. The utility model has a simple and reasonable structure and is easy to operate. The screw can be adjusted by rotating the adjusting nut, and the screw can be disassembled and installed while the transmission box, the barrel and the discharge flow channel are fixed, and the operation is convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] like Figure 1 As shown, a screw adjustment and disassembly structure of a plastic extruder comprises a barrel 8 and a screw 1, wherein the screw 1 is arranged in the barrel 8, the discharge port of the barrel 8 is fixedly connected to the discharge flow channel 20 through a flange, the transmission box 4 is fixed on the frame and fixedly connected to the other end flange of the barrel 8, an output shaft sleeve 2 coaxial with the screw 1 is provided through the transmission box 4, a fixing nut 6 is threadedly connected to the tail end of the output shaft sleeve 2, a detachable adjusting sleeve 3 is provided in the inner hole of the output shaft sleeve 2, the rear end shank of the screw 1 is inserted in the inner hole of the adjusting sleeve 3 and fixed, the tail of the adjusting sleeve 3 extends out of the output sleeve 2, and a long external thread is formed at the tail, a matching adjusting nut 7 is sleeved on the tail of the adjusting sleeve 3, abuts against the rear end of the output shaft sleeve 2, and is pressed by the fixing nut 6, the outer end of the adjusting nut 7 extends out of the fixing nut 6, and the adjusting sleeve 3 can be moved forward and backward by the positive and negative rotation of the adjusting nut 7 and is arranged in the output shaft sleeve 2, thereby realizing the adjustment of the screw 1.

[0016] The specific structure is as follows: the inner hole wall of the output sleeve 2 is provided with a keyway, the tail end is processed with an external thread, the fixing nut 6 is sleeved on the tail end of the output sleeve 2, the outer diameter of the adjusting sleeve 3 matches the inner hole of the output sleeve 2, the outer surface of the adjusting sleeve 3 is provided with a keyway, and the driving connection is achieved by the key block 9 matching the keyway of the output sleeve 2. The rear end handle of the screw 1 is installed at the front end position of the inner hole of the adjusting sleeve 2, a screw rod 5 is inserted in the adjusting sleeve 2 and connected to the screw rod handle, and the screw 1 and the adjusting sleeve 3 are positioned to form a whole through a nut gasket. The inner hole of the adjusting sleeve 3 is a stepped hole with a large front end and a small rear end, wherein the diameter of the screw rod 1 handle matches the front end inner hole of the adjusting sleeve 3, and the diameter of the screw rod 5 matches the rear end inner hole of the adjusting sleeve 3. The adjusting nut 7 is a T-shaped nut with an enlarged convex ring at one end, which penetrates the middle. The fixing nut 6 is a nut with large and small holes. The diameter of the convex ring of the adjusting nut 7 is consistent with the outer diameter of the output shaft sleeve 2. When installing, the adjusting nut 7 is sleeved on the tail of the adjusting sleeve 3, and the screw 1 and the adjusting sleeve 3 are inserted into the inner hole of the output shaft sleeve 2 from the rear end of the transmission box 4. The adjusting nut 7 is pressed and fixed by the fixing nut 6, and the screw 1 and the output shaft sleeve 2 are connected and assembled together by the key block. The outer end of the adjusting nut 7 is extended out of the fixing nut 6. The output end of the transmission box 4 and the output shaft sleeve 2 are equipped with a thrust bearing 10.

[0017] The operation process is:

[0018] When the gap distance A between the screw head and the discharge channel 20 needs to be adjusted, the adjusting nut 7 is rotated to move the adjusting sleeve 3 back and forth in the output shaft sleeve 2, and the screw 1 also moves back and forth in the barrel 8, thereby achieving the adjustment of the gap distance A.

[0019] When disassembling the screw rod 1 , the fixing nut 6 is completely unscrewed, and the adjusting sleeve 3 together with the screw rod 1 can be taken out from the barrel 8 and the transmission box 4 .

[0020] When installing the screw rod 1, the screw rod 1 and the adjusting sleeve 3 are inserted from the back of the transmission box 4, the fixing nut 6 is screwed on, and the adjusting nut 7 is tightened.

[0021] When installing and disassembling the screw 1, the transmission box 4, the barrel 8 and the discharge channel 20 are all fixed, and the operation is convenient and reliable.

[0022] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A screw adjustment and disassembly structure for a plastic extruder, comprising a barrel and a screw, wherein the screw is arranged in the barrel, the discharge port of the barrel is fixedly connected to the discharge channel through a flange, and the transmission box is fixed on the frame and fixedly connected to the flange at the other end of the barrel, characterized in that: An output sleeve coaxial with the screw is provided through the transmission case, and a fixing nut is threadedly connected to the rear end of the output sleeve, and a detachable adjusting sleeve is provided in the inner hole of the output sleeve, and the handle of the screw is inserted in the inner hole of the adjusting sleeve and fixed, and the rear end of the adjusting sleeve extends out of the output sleeve and is formed with an external thread, a matching adjusting nut is sleeved on the rear end of the adjusting sleeve and abuts against the rear end of the output sleeve and is tightened by the fixing nut, and the outer end of the adjusting nut extends out of the fixing nut, and the adjusting sleeve can be moved forward and backward by the forward and reverse rotation of the adjusting nut and is arranged in the output sleeve, thereby realizing the adjustment of the screw.

2. The screw rod adjustment and disassembly structure according to claim 1, characterized in that: The inner hole wall of the output shaft sleeve is provided with a keyway, and the tail end is processed with an external thread. The fixing nut is sleeved on the tail end of the output shaft sleeve. The outer diameter of the adjusting sleeve matches the inner hole of the output shaft sleeve. The outer surface of the adjusting sleeve is provided with a keyway, which matches with the keyway of the output shaft sleeve through a key block.

3. The screw rod adjustment and disassembly structure according to claim 2, characterized in that: The rear end handle of the screw is installed at the front end position of the inner hole of the adjusting sleeve. A screw rod is inserted into the adjusting sleeve and connected to the screw handle. The screw and the adjusting sleeve are positioned to form a whole through a nut gasket.

4. The screw rod adjustment and disassembly structure according to claim 3, characterized in that: The inner hole of the adjusting sleeve is a stepped hole with a larger front end and a smaller rear end, wherein the diameter of the screw shank matches the front inner hole of the adjusting sleeve, and the diameter of the screw pull rod matches the rear inner hole of the adjusting sleeve.

5. The screw rod adjustment and disassembly structure according to claim 4, characterized in that: The adjusting nut is a T-shaped nut with an enlarged diameter convex ring at one end, and the fixing nut is a nut with large and small holes. The diameter of the convex ring of the adjusting nut is consistent with the outer diameter of the output shaft sleeve. During installation, the adjusting nut is sleeved on the tail of the adjusting sleeve, and the screw and the adjusting sleeve are inserted into the inner hole of the output shaft sleeve from the rear end of the transmission box, and the adjusting nut is tightened and fixed by the fixing nut.

6. The screw rod adjustment and disassembly structure according to any one of claims 1 to 5, characterized in that: The output end of the transmission box and the output shaft sleeve are equipped with thrust bearings.

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