Self-boring tooling and self-boring process for thrust pack of reducer for single screw extruder

Abstract

The present invention relates to a self-boring tooling and self-boring process for a thrust pack of a reducer specially used for a single-screw extruder, and belongs to the field of professional reducer processing technology. The tooling includes: a self-boring mechanism for thrust pack processing; a support seat for fixing the self-boring mechanism; a tensioning assembly for fixing the support seat to one side of the output shaft of the reducer; wherein the self-boring mechanism rotates with the rotation of the output shaft of the reducer through the support seat. The process is based on the above tooling and adopts a numerical control system, and uses the precise positioning and calculation of the numerical control system to control and realize the automatic feeding of the tool holder in the self-boring mechanism, thereby completing the rough processing and fine processing instructions for the thrust pack. The present invention adopts the tensioning assembly as an inner hole centering mechanism to improve the coaxiality and verticality of the entire self-boring mechanism and the output shaft, reduce the system error caused by the installation process of the self-boring mechanism, ensure the processing accuracy of the thrust pack of the reducer, and greatly improve the stability of the operation of the reducer.

Description

Technical Field

[0001] The invention relates to the technical field of a special reducer for a single screw extruder, and in particular to a self-boring process and tooling for a thrust pack of a special reducer for a single screw extruder based on a numerical control processing method. Background Art

[0002] The reducer specially designed for single screw extruder has the characteristics of compact design structure, high load-bearing capacity, stable transmission, low noise and high efficiency. It is mainly used in plastic and rubber single screw extruder equipment.

[0003] The reducer specially designed for single-screw extruders needs to be connected to the driven equipment at the output end, not only axially connected but also radially positioned. This places higher processing accuracy requirements on the output end of the reducer. However, after such reducers are assembled, due to the influence of the cumulative assembly errors, there are often problems such as the thrust pack stop installation size and cylindricity of the reducer specially designed for single-screw extruders not meeting the standards, the coaxiality of the positioning stop on the output shaft and the thrust pack installation surface of the box body not meeting the standards, and the verticality is poor, resulting in unqualified product quality.

[0004] In response to the technical deficiencies of the reducer dedicated to single-screw extruders, the existing process method is to perform precision correction through a self-boring processing device that controls the boring and cutting processing by simple manual tapping. However, in the actual processing process, the above-mentioned processing technology cannot guarantee the size and cylindricity accuracy of the reducer's housing thrust pack, the coaxiality and verticality of the positioning stop on the output shaft and the housing thrust pack installation surface, because there is an installation gap between the simple manual self-boring processing device and the inner hole of the output shaft of the reducer dedicated to the single-screw extruder during the installation process, and the manual tapping operation cannot accurately control the processing size, so the product quality improvement of the reducer has reached a bottleneck. In addition, the above-mentioned processing technology has high requirements on the actual operating skills and experience of the operator, and there are high safety hazards in actual operation. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention provides a self-boring tooling and self-boring process for a thrust pack of a reducer specially used for a single-screw extruder, which uses CNC machining to control the machining size and cylindricity of the stop of the reducer thrust pack, so that the quality of the processed reducer specially used for a single-screw extruder can better meet customer needs.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A self-boring tool for a thrust pack of a reducer specially used for a single-screw extruder, wherein the reducer output shaft has an axial center through hole, comprising: a self-boring mechanism for thrust pack processing; a support seat for fixing the self-boring mechanism; a tensioning assembly for fixing the support seat to one side of the reducer output shaft; wherein the center of the support seat is coaxial with the reducer output shaft, and the self-boring mechanism rotates through the support seat as the reducer output shaft rotates.

[0008] Furthermore: the tensioning assembly includes a locking rod, an expansion sleeve and a conical seat; the conical seat includes a conical sleeve and a fixed seat for fixed connection with the support seat; the expansion sleeve includes an inner thread sleeve and an expansion sleeve, and a notch for inserting the conical sleeve is formed between the inner thread sleeve and the expansion sleeve; the expansion sleeve is built into the central through hole on one side of the output end of the output shaft of the reducer; the locking rod is horizontally inserted into the central through hole, one end of which is threadedly connected to the inner thread sleeve of the expansion sleeve, and the other end is tightly connected to the input end of the output shaft of the reducer through a locking nut; the conical sleeve of the conical seat is inserted into the notch of the expansion sleeve, and the expansion sleeve of the expansion sleeve is expanded and tightly matched with the inner wall of the central through hole through the conical surface cooperation between the conical sleeve and the expansion sleeve; a locking bolt is provided, which passes through the fixed seat and is threadedly connected to the inner thread sleeve to realize the adjustment and locking of the relative position between the expansion sleeve and the conical seat.

[0009] In order to realize CNC automatic machining and accurately control the machining size: the self-boring mechanism includes an XY electric displacement platform, a tool holder, and a counterweight block. The XY electric displacement platform is fixed on a support seat, and the tool holder is fixed on the XY electric displacement platform. The counterweight block is used to balance the weight of the XY electric displacement platform so that the support seat keeps rotating around its center.

[0010] Furthermore: the support seat is in a "Z"-shaped structure, wherein one support arm on the support seat is used for the fixed installation of the self-boring mechanism, and the other support arm is used for the adjustment installation of the counterweight block; this facilitates the balance control of the structure and makes the rotation around the center more stable during the processing.

[0011] In order to ensure transmission stability, a flat key is provided between the expansion sleeve of the expansion sleeve and the inner wall of the central through hole of the output shaft of the reducer. The power of the output shaft of the reducer dedicated to the single screw extruder is further transmitted by adding the flat key.

[0012] In order to simplify the alignment process, improve installation efficiency, quickly ensure the coaxiality of the output shaft, the fixed seat and the support seat, and facilitate the connection with the support seat, the fixed seat is a circular structure, and its center is coaxial with the output shaft of the reducer.

[0013] Furthermore, the conical surface matching area between the cone sleeve and the expansion sleeve accounts for more than 70% of the cone surface area of ​​the cone sleeve; the tight matching area between the expansion sleeve and the inner wall of the reducer output shaft accounts for more than 70% of the outer surface area of ​​the expansion sleeve. Thus, the coaxiality of the cone seat is guaranteed, and the stability and reliability of the power rotation of the reducer output shaft is guaranteed.

[0014] Furthermore: the self-boring mechanism is also provided with an industrial computer and a numerical control system, the XY electric displacement platform includes a grating ruler, an X-axis displacement platform, a Y-axis displacement platform, an X-axis servo motor and a Y-axis servo motor and motor controllers corresponding to the two servo motors; the motor controller realizes the collection and feedback transmission of the tool holder coordinate value to the industrial computer through the grating ruler; the numerical control system collects and controls the industrial computer to realize information instruction transmission and feedback with the motor controller, thereby completing the numerical control processing of the self-boring mechanism.

[0015] The self-boring mechanism of the present invention drives the tool holder to rotate around the central axis of the output shaft of the special reducer for the single-screw extruder, and the tool holder moves to perform processing.

[0016] The present invention can realize the self-boring process of the reducer thrust pack under the numerical control machining system, and the specific steps include: a. starting the industrial computer and the numerical control system, the industrial computer transmits the starting position signal of the tool holder to the motor controller, and the motor controller controls the X-direction and Y-direction displacement platforms to move, and moves the tool holder to the machining starting position;

[0017] b. The motor controller feeds back the actual coordinate value of the tool holder to the industrial computer through signal transmission; the industrial computer automatically enters the coordinate value of the tool holder into the numerical control system; the numerical control system automatically calculates the required moving distance of the tool holder through the coordinate value entered by the industrial computer and the preset processing coordinate value, and transmits the control signal to the motor controller through the industrial computer;

[0018] c. Start the reducer. The output shaft of the reducer drives the self-boring mechanism to rotate around the output shaft through the tensioning assembly. The motor controller controls the X-axis and Y-axis displacement platforms to perform feed motion to achieve rough machining of the reducer thrust package stopper and end face.

[0019] d. Turn off the reducer, adjust the tool holder of the self-boring mechanism to a vertical state when the reducer is stationary, measure the dimensions of the thrust package after processing, and input the measurement results into the CNC system. The CNC system transmits the control signal to the motor controller through calculation;

[0020] e. Restart the reducer, and the self-boring mechanism will finish the reducer thrust package stop and end face through the tool holder rotation and displacement platform feed motion;

[0021] f. After the processing is completed, the motor controller will feed back the actual coordinate value after processing to the industrial computer; the industrial computer will automatically enter and feed back to the CNC system; based on the information, the CNC system will feed back the end signal to the motor controller through the industrial computer and perform operations such as retracting the tool.

[0022] The beneficial effects of the present invention are:

[0023] 1. A CNC machining system different from the manual tapping control in the background technology is used to accurately control the machining size and cylindricity of the reducer thrust pack stopper, thereby improving the docking accuracy between the reducer output end and the thrust pack and the customer. On the one hand, this reduces the production cost of rework of the reducer due to insufficient docking accuracy with the client, while at the same time improving the stability and service life of the reducer at the customer's site.

[0024] 2. At the same time, the connection method between the entire self-boring mechanism and the output shaft of the reducer in the background technology is improved. The present invention adopts the tensioning assembly as an inner hole centering mechanism to improve the coaxiality and verticality of the entire self-boring mechanism and the output shaft, reducing the system error caused by the installation process of the self-boring mechanism, ensuring the processing accuracy of the reducer thrust pack, and greatly improving the stability of the reducer operation. In addition, compared with the processing technology in the background technology, the operating skills and experience requirements of the operator are reduced, eliminating the safety hazards in the operation process.

[0025] 3. The present invention simulates the actual customer usage scenario of the reducer for single screw extruders, and uses the drive motor and the reducer for single screw extruders themselves as the main power source for processing the reducer for single screw extruders. At the same time, the output shaft of the reducer for single screw extruders connected to the user's product is used as a reference to process the thrust pack of the reducer for single screw extruders, thereby ensuring the installation accuracy with the user's product and improving the stability and service life of the reducer in on-site operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a special reducer for a single screw extruder in this embodiment;

[0027] Figure 2 It is an assembly stereogram of the self-boring processing of the thrust pack of the reducer in this embodiment;

[0028] Figure 3 It is an assembly cross-sectional view of the self-boring processing of the thrust pack of the reducer in this embodiment;

[0029] Figure 4 for Figure 3 Enlarged view of the middle H part;

[0030] Figure 5 is a three-dimensional structural diagram of the support base in this embodiment;

[0031] Figure 6 Schematic diagram of the structure of the XY electric displacement platform in this embodiment;

[0032] Figure 7 Schematic diagram of the connection structure between the cone seat and the support seat in this embodiment.

[0033] Figure numerals: 1. Speed ​​reducer for single screw extruder; 11. output shaft; 111. center through hole; 12. thrust pack; 2. support seat; 21. fixed bracket; 3. self-boring mechanism; 31. XY electric displacement platform; 311. X displacement platform; 312. Y displacement platform; 313. X servo motor; 314. Y servo motor; 32. counterweight; 33. tool holder; 34. boring tool; 35. cable; 4. tensioning assembly; 41. locking rod; 42. expansion sleeve; 421. inner screw sleeve; 422. expansion sleeve; 43. cone seat; 431. cone sleeve; 432. fixed seat; 433. fixing screw hole; 44. locking nut; 45. locking bolt; 46. flat key; 5. motor. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described below are only typical embodiments recorded in the present invention. For ordinary technicians in this field, other similar variations can be obtained based on these contents without creative work.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] like Figure 1As shown: the axial center of the special reducer for single-screw extruder is an output shaft, and the output shaft is provided with an axial center through hole 111. The tooling and process involved in the present invention are designed with reference to the above-mentioned reducer. What needs to be processed in the present invention is the stopper and end face of the thrust pack 12.

[0038] like Figure 3 , Figure 4 and Figure 7 As shown: the tensioning assembly includes a locking rod 41, an expansion sleeve 42 and a cone seat 43. The expansion sleeve includes an inner thread sleeve 421 and an expansion sleeve 422. The inner thread sleeve 421 is connected to one side of the expansion sleeve 422, and a notch is formed on the other side. The inner wall of the expansion sleeve forms an inner conical surface structure corresponding to the axial depth of the notch. The cone seat includes a cone sleeve 431 and a fixed seat 432; the fixed seat 432 is a disc structure, and a fixing screw hole 433 is provided in the center; the outer side of the cone sleeve 431 is provided with an outer conical surface structure matching the inner conical surface structure of the expansion sleeve; the cone sleeve is also provided with a center hole.

[0039] like Figure 3 , Figure 5 and Figure 7 As shown, the support seat 2 is in a "Z" shape, one of the support arms is provided with a fixing bracket 21, which is used for fixing and installing the self-boring mechanism; the other support arm is provided with multiple rows of fixing holes, which are used for installing the counterweight 32 and adjusting the front and rear positions. The connecting part connecting the two support arms is used for docking and installation with the fixing seat 432.

[0040] like Figure 2 , Figure 3 and Figure 6 As shown in the figure, the self-boring mechanism includes an XY electric displacement platform 31, a tool holder 33, a counterweight 32, an industrial computer and a numerical control system; the XY electric displacement platform includes a grating ruler, an X-axis displacement platform 311, a Y-axis displacement platform 312, an X-axis servo motor 313 and a Y-axis servo motor 314 and controllers corresponding to the two servo motors; the industrial computer and the servo motor controllers realize signal transmission through cables 35. The construction of the grating ruler and the XY electric displacement platform is a known structure, and the numerical control system is a mature control technology, which will not be discussed one by one.

[0041] like Figure 2 , Figure 3 and Figure 4As shown: when the thrust pack of the reducer dedicated to the single-screw extruder needs to be self-bored, the expansion sleeve 42 is first installed into the corresponding position in the central through hole on one side of the output end of the output shaft, and the locking rod 41 is horizontally inserted into the central through hole from the input end of the output shaft and is threadedly connected to one end of the inner thread sleeve 421 of the expansion sleeve; the tapered sleeve 431 is inserted into the notch of the expansion sleeve, and the locking bolt 45 is used to pass through the fixing screw hole 433 and the center hole of the tapered sleeve and connected to the other end of the inner thread sleeve 421 of the expansion sleeve, and the locking bolt 45 is adjusted to increase the insertion depth of the tapered sleeve 431, and the expansion sleeve 422 is supported by the tapered surface between the tapered sleeve and the expansion sleeve, and finally the expansion sleeve 422 is tightly matched with the inner wall of the central through hole; finally, the locking rod 41 is adjusted, and it is tightly connected to the input end of the output shaft of the reducer through the locking nut 44.

[0042] In this embodiment, after being fixed, the conical surface matching area between the cone sleeve 431 and the expansion sleeve 422 accounts for more than 95% of the cone surface area of ​​the cone sleeve; the expansion sleeve 422 and the inner wall of the central through hole 11 of the reducer output shaft fit in an area of ​​more than 90%, basically achieving gapless fit, ensuring the firmness of the connection between each other, and at the same time ensuring the concentricity and verticality of the cone seat installation. In this embodiment, in order to ensure the stability of the transmission, two flat keys 46 are provided between the expansion sleeve 422 of the expansion sleeve and the inner wall of the central through hole of the output shaft, and the power of the output shaft of the reducer is further transmitted by adding the flat keys 46.

[0043] like Figure 7 As shown, when installing the self-boring mechanism, first connect the connecting part of the support seat 2 to the fixing seat 432, and achieve precise fixed connection with the fixing seat 432 by positioning the cone pin and bolts. Figure 2 , Figure 3 and Figure 5 As shown: The XY electric displacement platform is fixed on a support arm of the support frame through a fixed bracket 21, and the tool holder 33 is installed on the top layer of the XY electric displacement platform. In this embodiment, the tool holder 33 is installed on the X displacement platform 311; a boring tool 34 is installed on the tool holder 33 through a boring tool rod. By accurately controlling the XY electric displacement platform, the boring tool 34 can be extended out of the support frame 2 and aligned with the processing position required by the reducer thrust pack. The other support arm of the support seat is used to install a counterweight block. By adjusting the counterweight block and the installation position, the counterweight block and the XY electric displacement platform are in a balanced state, reducing the output torque of the servo motor and the vibration generated during the processing, ensuring the stability of the operation, and ensuring the coaxiality of the reducer thrust pack stopper processed by the self-boring mechanism and the center through hole of the reducer output shaft, as well as the verticality of the reducer thrust pack end face and the center through hole of the output shaft.

[0044] This embodiment can realize the self-boring process of the reducer thrust pack based on the CNC machining method by setting up an industrial computer and a CNC system. The specific operations are as follows:

[0045] The industrial computer transmits control signals to the two servo motor controllers respectively, controls the movement of the X-axis displacement platform 311 and the Y-axis displacement platform 312, and moves the tool holder to the required processing position; the controllers of the X-axis servo motor 313 and the Y-axis servo motor 314 feed back the actual coordinate value of the tool holder to the industrial computer through signal transmission; the industrial computer automatically enters the coordinate value of the tool holder into the numerical control system; the numerical control system automatically calculates the required moving distance of the tool holder through the coordinate value entered by the industrial computer and the preset processing coordinate value; the numerical control system feeds back the required processing parameters to the industrial computer; the industrial computer starts the special reducer and self-boring mechanism of the single-screw extruder, and executes the processing parameters fed back by the numerical control system to process the thrust pack of the special reducer for the single-screw extruder.

[0046] After the self-boring mechanism completes the processing of the thrust pack of the reducer for the single screw extruder, the controllers of the X-direction servo motor and the Y-direction servo motor feed back the actual coordinate values ​​after processing to the industrial computer; the industrial computer then feeds back the actual processing coordinate values ​​to the numerical control system; the numerical control system outputs the processing results and feeds back the processing end signal to the industrial computer. The industrial computer transmits signals to the controllers of the X-direction servo motor and the Y-direction servo motor and performs operations such as retracting the tool.

[0047] The mechanical working process of the numerical control process of this embodiment is: start the motor 5, the motor 5 drives the reducer output shaft to rotate through the belt, the reducer output shaft drives the self-boring mechanism to rotate around the output shaft through the tensioning component, and the reducer thrust package stop and end face are rough-processed by the rotation of the tool holder of the self-boring mechanism and the feed movement of the platform; after the rough processing is completed, turn off the motor, adjust the self-boring mechanism tool holder to a vertical state when the reducer is stationary, and measure the size of the thrust package after processing, input the measurement result into the numerical control system, and use the industrial computer to control the XY electric displacement platform for precise movement and positioning again; restart the reducer, and the self-boring mechanism performs fine processing on the reducer thrust package stop and end face through the rotation of the tool holder and the feed movement of the platform; after completion, perform operations such as retracting the tool according to the instructions.

[0048] Based on the above embodiments of the invention, the relevant staff can make various changes and modifications without departing from the technical concept of the invention through the above description. The technical scope of the invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A self-boring tool for a thrust pack of a reducer specially used for a single screw extruder, wherein the output shaft of the reducer has an axial center through hole, characterized in that: include: A self-boring mechanism for thrust pack processing; a support seat for fixing the self-boring mechanism; a tensioning assembly for fixing the support seat to one side of the output shaft of the reducer; wherein the center of the support seat is coaxial with the output shaft of the reducer, and the self-boring mechanism rotates as the output shaft of the reducer rotates through the support seat; the tensioning assembly includes a locking rod, an expansion sleeve and a conical seat; the conical seat includes a conical sleeve and a fixed seat for fixed connection with the support seat; the expansion sleeve includes an inner thread sleeve and an expansion sleeve, and a notch for inserting the conical sleeve is formed between the inner thread sleeve and the expansion sleeve; The expansion sleeve is built into the central through hole on one side of the output end of the output shaft of the reducer; the locking rod is horizontally inserted into the central through hole, one end of which is threadedly connected to the internal thread sleeve of the expansion sleeve, and the other end is tightly connected to the input end of the output shaft of the reducer through a locking nut; the tapered sleeve of the cone seat is inserted into the notch of the expansion sleeve, and the expansion sleeve of the expansion sleeve is expanded and tightly matched with the inner wall of the central through hole through the tapered surface cooperation between the tapered sleeve and the expansion sleeve; a locking bolt is provided, which passes through the fixing seat and is threadedly connected to the internal thread sleeve to realize the adjustment and locking of the relative position between the expansion sleeve and the cone seat.

2. The self-boring tool according to claim 1, characterized in that: The self-boring mechanism includes an XY electric displacement platform, a tool holder, and a counterweight block. The XY electric displacement platform is fixed on a support seat, the tool holder is fixed on the XY electric displacement platform, and the counterweight block is used to balance the weight of the XY electric displacement platform so that the support seat keeps rotating around its center.

3. The self-boring tool according to claim 2, characterized in that: The support seat is in a "Z"-shaped structure, wherein one support arm on the support seat is used for fixing and installing the self-boring mechanism, and the other support arm is used for adjusting and installing the counterweight block.

4. The self-boring tool according to claim 1, characterized in that: A flat key is arranged between the expansion sleeve of the expansion sleeve and the inner wall of the central through hole of the output shaft of the reducer.

5. The self-boring tool according to claim 1, characterized in that: The fixing seat is a circular structure, and the center of the circle is coaxial with the output shaft of the reducer.

6. The self-boring tool according to claim 1, characterized in that: The conical surface matching area between the tapered sleeve and the expansion sleeve accounts for more than 70% of the conical surface area of ​​the tapered sleeve; the tight matching area between the expansion sleeve and the inner wall of the reducer output shaft accounts for more than 70% of the outer side surface area of ​​the expansion sleeve.

7. The self-boring tool according to claim 2, characterized in that: The self-boring mechanism also includes an industrial computer and a numerical control system. The XY electric displacement platform includes a grating ruler, an X-axis displacement platform, a Y-axis displacement platform, an X-axis servo motor and a Y-axis servo motor, and motor controllers corresponding to the two servo motors. The motor controller collects and feeds back the tool holder coordinate value to the industrial computer through the grating ruler. The numerical control system collects and controls the industrial computer to realize information and command transmission and feedback with the motor controller, thereby completing the numerical control processing of the self-boring mechanism.

8. The self-boring process of the thrust pack of the reducer for single screw extruder is characterized by: Based on the self-boring tooling of claim 7, the specific steps include: a. Start the industrial computer and CNC system. The industrial computer transmits the starting position signal of the tool holder to the motor controller. The motor controller controls the X-axis and Y-axis displacement platforms to move and move the tool holder to the starting position of processing. b. The motor controller feeds back the actual coordinate value of the tool holder to the industrial computer through signal transmission; the industrial computer automatically enters the coordinate value of the tool holder into the numerical control system; the numerical control system automatically calculates the required moving distance of the tool holder through the coordinate value entered by the industrial computer and the preset processing coordinate value, and transmits the control signal to the motor controller through the industrial computer; c. Start the reducer. The output shaft of the reducer drives the self-boring mechanism to rotate around the output shaft through the tensioning assembly. The motor controller controls the X-axis and Y-axis displacement platforms to perform feed motion to achieve rough machining of the reducer thrust package stopper and end face. d. Turn off the reducer, adjust the tool holder of the self-boring mechanism to a vertical state when the reducer is stationary, measure the dimensions of the thrust package after processing, and input the measurement results into the CNC system. The CNC system transmits the control signal to the motor controller through calculation; e. Restart the reducer, and the self-boring mechanism will finish the reducer thrust package stop and end face through the tool holder rotation and displacement platform feed motion; f. After the processing is completed, the motor controller will feed back the actual coordinate value after processing to the industrial computer; the industrial computer will automatically enter and feed back to the CNC system; based on the information, the CNC system will feed back the end signal to the motor controller through the industrial computer and perform operations such as retracting the tool.

Images