A puffed machine screw detection device

Abstract

The present application relates to the field of screw detection equipment, specifically is a kind of bulking machine screw detection equipment, including base, and for limiting screw and driving its rotation drive assembly, base is provided with the detection mechanism for detecting the outer diameter of screw, heating mechanism for the local shaft section of screw is radiated heating, friction mechanism for simulating the physical contact and friction of the material of simulation accumulation screw, the temperature gradient in the actual working condition of the present application is simulated using two heating covers;Through several grinding blocks, simulate the physical contact and friction heat of screw in actual working condition, while using the periodic contact of grinding block when screw rotates, simulate the transient radial heat pulse of screw when working;Finally, use range finder to monitor screw in real time, by detecting the expansion degree, jumping condition and bending condition of screw, the thermal expansion performance of screw under simulated actual working condition is comprehensively judged, so that the detection result is closer to the real working condition.

Description

Technical Field

[0001] This invention relates to the field of screw testing equipment, specifically an extruder screw testing device. Background Technology

[0002] The screw of an extruder is a core working component of extruders in the feed, food, and biomass energy processing industries. It is usually located inside the extruder barrel and conveys, extrudes, shears, and mixes materials through high-speed rotation. During this process, the screw not only bears complex mechanical loads but also operates in a high-temperature environment for extended periods. The increase in temperature causes the screw material to thermally expand, thereby changing the fit clearance between the screw and the barrel. Therefore, accurate testing of the screw's thermal expansion performance is of crucial engineering significance for assessing its operational reliability, optimizing structural design, and ensuring the long-term stable operation of the extruder.

[0003] Currently, the industry mainly uses conventional methods for determining the coefficient of thermal expansion of solid materials to test the thermal expansion performance of extruder screws. These methods typically place the screw under test in a temperature-controlled heating furnace and use thermal radiation heating to measure the change in screw dimensions under uniform heating conditions, thereby calculating the linear expansion coefficient of the material. This testing method has the advantages of standardization and ease of operation, and can reflect the thermophysical properties of the material itself, making it a common means of material inspection upon arrival at the factory.

[0004] However, in actual production conditions, the heating of the extruder screw is far more complex than uniform heating. First, part of the screw's heat comes from frictional heat generated by contact with the material, which acts directly on the screw surface. In addition, the material's resistance stress on the screw causes the screw to be subjected to the coupling effect of frictional heat and mechanical force in actual operation.

[0005] Secondly, due to the requirements of the extrusion process, the barrel is usually divided into a feeding section, a compression and melting section, and a homogenization section along the axial direction. The temperature settings of each section are different, resulting in a significant temperature gradient in the screw along the axial direction. Furthermore, the material forms a local accumulation zone at the bottom of the barrel under the action of gravity. Although the screw is in a continuous rotation state, when the screw thread rotates through this lower accumulation zone, the local material density increases and the degree of compaction increases, resulting in an instantaneous increase in shear friction resistance and generating instantaneous high heat input. This causes the screw surface to be subjected to periodic transient radial heat pulses during rotation.

[0006] The complex heating mode described above, which combines frictional heat generation and external heating with the superposition of axial temperature gradient and radial heat pulse, will cause the screw to exhibit a series of behaviors that are completely different from those of uniform heating. For example, periodic radial heat pulses will cause the screw to undergo "thermal bending" deformation.

[0007] In summary, traditional thermal expansion detection methods based on uniform thermal radiation heating cannot simulate the heat input mechanism involving contact friction heating in actual working conditions, nor can they reproduce complex conditions such as axial temperature gradients and transient radial thermal pulses. Furthermore, they cannot reflect the coupling effect between mechanical contact and thermal expansion. As a result, their detection results can only reflect the material properties under ideal conditions, making it difficult to truly assess the thermal expansion behavior and structural reliability of the screw under actual service conditions. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an extruder screw detection device, including a base and a drive assembly for limiting the screw and driving it to rotate. The base is provided with a detection mechanism for detecting the outer diameter of the screw, a heating mechanism for radiating heating of a local shaft section of the screw, and a friction mechanism for simulating the physical contact and friction of accumulated materials with the screw.

[0009] The detection mechanism includes three sets of rangefinders arranged on the upper part of the screw and located on the left, middle and right sides of the screw, respectively. The detection data of the three sets of rangefinders are compared to determine the degree of expansion, runout and bending of the screw.

[0010] The heating mechanism includes two heating covers that are mounted on the front and rear sides of the screw via movable components. The two heating covers work together to locally heat a portion of the screw shaft, simulating the temperature gradient in the actual working conditions of the screw.

[0011] The friction mechanism includes several bases arranged at equal intervals on the lower left side of the screw via a drive assembly. Several grinding blocks arranged in a matrix on the bases via a connecting assembly are used to generate heat through friction with the screw.

[0012] By using a heating hood to simulate a temperature gradient and grinding blocks to simulate physical contact and frictional heat generation, the rangefinder can perform thermal expansion detection on the screw under simulated actual working conditions.

[0013] Preferably, the detection mechanism further includes a support beam fixedly installed on the base, and the support beam is slidably connected to the rangefinder in the left and right directions.

[0014] Preferably, each group of rangefinders consists of two units. In the initial state, one rangefinder in each group corresponds to the screw spindle, and the other corresponds to the screw blade.

[0015] Preferably, the movable component includes a movable frame that is slidably mounted on the base, the movable frame being slidably connected to the heating cover in the front and back, and the base being provided with a screw drive structure for driving the movable frame to move left and right.

[0016] Preferably, the movable component further includes two hydraulic cylinders fixedly mounted on the movable frame, with the telescopic sections of the hydraulic cylinders fixedly connected to the corresponding heating covers.

[0017] Preferably, the driving component includes a transmission structure fixedly installed on the base, the transmission structure being fixedly connected to the base, and the base being driven to move cyclically through the transmission structure.

[0018] Preferably, the connecting component includes an arc-shaped frame slidably connected to the base along its length, and a wobbling block is slidably disposed on the arc-shaped frame along its arc trajectory.

[0019] Preferably, the wobbling block is provided with helical springs on both the front and rear sides, and both ends of the helical springs are fixedly connected to the arc-shaped frame.

[0020] Preferably, the grinding block and the wobbling block are movably connected, so that the wobbling block adaptively fits onto the blades of the screw.

[0021] Preferably, a cylinder is fixedly installed on the base, and the telescopic section of the cylinder is fixedly connected to the corresponding arc-shaped frame.

[0022] The beneficial effects of this invention are as follows: First, this invention uses two heating covers combined together and placed over the outside of the screw to locally heat a portion of the screw shaft, simulating the temperature gradient in the actual working conditions of the screw; second, it uses several grinding blocks arranged in a matrix to physically contact and rub against the screw blades, thus simulating the physical contact and frictional heat generation of the screw in actual working conditions; third, it uses the periodic contact between the screw and the grinding blocks during rotation to simulate the transient radial thermal pulses of the screw during operation; finally, it uses a rangefinder to monitor the screw in real time, and by detecting the degree of expansion, runout, and bending of the screw, it comprehensively judges the thermal expansion performance of the screw under simulated actual working conditions, making the test results closer to the real working state.

[0023] Second, this invention uses three sets of rangefinders to simultaneously detect the left, middle, and right sides of the screw in real time. This not only detects the expansion of the screw's outer diameter but also detects the bending of the screw by comparing the three sets of data. By using two rangefinders in each set, the outer diameter of the screw's spindle and blades can be detected simultaneously, resulting in more comprehensive detection coverage and accurate reflection of the deformation characteristics of different parts of the screw, thereby significantly improving the accuracy and reliability of the detection results.

[0024] Third, this invention uses a cylinder to drive the arc-shaped frame to move, so that the arc-shaped frame drives the grinding block on it to adaptively fit and contact the blades of the screw through the shaking block, thereby achieving friction against the screw; by controlling the pushing force of the cylinder, the force of the grinding block against the screw can be adjusted, thereby controlling the degree of frictional heat generation, so as to adapt to the simulation requirements of different material properties and working conditions, and improve the versatility and flexibility of the testing equipment.

[0025] Fourth, this invention uses a swaying block that slides along the arc-shaped trajectory of the arc frame, which can simulate the movement of the material piled up at the bottom when the screw rotates. This makes the contact between the grinding block and the screw blades closer to the actual interaction process between the material and the screw, further restoring the complex mechanical and thermal environment in actual working conditions, thereby ensuring that the thermal expansion test results are more realistic and have engineering reference value. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention when detecting a screw.

[0028] Figure 2 This is a schematic diagram of the structure when the heating cover heats a local section of the screw shaft in this invention.

[0029] Figure 3 This is a schematic diagram of the structure of the drive assembly rotating the screw in this invention.

[0030] Figure 4 This is a side view of the heating cover assembled in this invention.

[0031] Figure 5 This is a partial structural diagram of the driving component, base, seat, and connecting component in this invention.

[0032] Figure 6 This is a partial front view of the grinding block rubbing against the screw blade in this invention.

[0033] Figure 7 This is a schematic diagram of the structure of the grinding block, arc frame, shaking block and base in this invention.

[0034] In the diagram: 1. Base; 2. Drive assembly; 3. Detection mechanism; 4. Heating mechanism; 5. Friction mechanism; 31. Rangefinder; 32. Support beam; 41. Moving component; 42. Heating cover; 51. Drive assembly; 52. Base; 53. Connecting component; 54. Grinding block; 411. Moving frame; 412. Hydraulic cylinder; 531. Arc frame; 532. Shaking block; 533. Cylinder. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0036] See Figure 1 , Figure 2 and Figure 3An extruder screw testing device includes a base 1 and a drive assembly 2 for limiting the screw and driving it to rotate. The base 1 is provided with a testing mechanism 3 for detecting the outer diameter of the screw, a heating mechanism 4 for radiating heating of a local shaft section of the screw, and a friction mechanism 5 for simulating the physical contact and friction of accumulated materials with the screw.

[0037] During testing, the screw is locked and limited by the drive assembly 2. Then, the heating mechanism 4 is placed over the outside of the screw. The screw is then rotated again by the drive assembly 2. At the same time, the left side of the screw is locally heated by the heating mechanism 4, and the left side of the screw blades is heated by friction by the friction mechanism 5. This simulates the coupling effect of physical mechanical stress and friction heating on the screw. Meanwhile, the rotating screw blades periodically contact the friction mechanism 5, thus simulating the transient radial thermal pulse of the screw during operation.

[0038] During the rotation of the screw, the outer diameter of the screw is detected in real time by the detection mechanism 3. By comparing the detected data, the deformation characteristics of different parts of the screw are accurately reflected, thereby judging the detection results.

[0039] In this embodiment, the drive assembly 2 includes a headstock fixedly disposed on the upper right side of the base 1 and a tailstock slidably disposed on the upper left side of the base 1. Both the headstock and the tailstock are equipped with four-jaw chucks. During testing, the four-jaw chucks can coaxially center and clamp the left and right ends of the screw, and the two four-jaw chucks abut against the two ends of the screw to axially limit the screw. During testing, the spindle inside the headstock drives the corresponding four-jaw chucks to rotate, so that the screw can rotate at a uniform speed during testing.

[0040] In this embodiment, the screw speed is the normal speed of the screw during actual operation.

[0041] See Figure 1 , Figure 2 and Figure 4 The heating mechanism 4 includes two heating covers 42 that are set on the front and rear sides of the screw via a movable component 41. The two heating covers 42 work together to locally heat a portion of the screw shaft, simulating the temperature gradient in the actual working condition of the screw.

[0042] Before testing, the two heating covers 42 are moved to the left side of the screw by the moving component 41. In this embodiment, when the screw is clamped by the drive assembly 2, the compression melting section and the homogenization section of the screw are located on the left side of the screw as a whole, so that the heating covers 42 are combined and covered on the left side of the screw. During testing, the heating covers 42 locally radiate heat the compression melting section and the homogenization section of the screw, thereby simulating the temperature gradient of the screw during operation.

[0043] The temperature gradient described above is as follows: the compression and melting section and homogenization section on the left side of the screw are heated to a high temperature, while the feeding section on the right side is heated to a low temperature.

[0044] To move the heating shroud 42 to the compression and melting section and homogenization section of the screw, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 3 and Figure 4 The moving component 41 includes a moving frame 411 that is slidably mounted on the base 1. The moving frame 411 is slidably connected to the heating cover 42. The base 1 is provided with a screw drive structure for driving the moving frame 411 to move left and right.

[0045] During testing, the movable frame 411 is moved to the left side of the screw via the screw drive structure, so that the movable frame 411 drives the heating cover 42 to the left side of the screw. In this embodiment, the screw drive structure adopts a common transmission method in the traditional structure, including rotating the screw set on the base 1. The screw is threadedly connected to the movable frame 411. A synchronous motor with an output shaft fixedly connected to the screw is fixedly installed on the base 1.

[0046] To ensure that the two heating covers 42 are combined and positioned on the outside of the screw, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 4 The moving component 41 also includes two hydraulic cylinders 412 fixedly mounted on the moving frame 411. The telescopic section of the hydraulic cylinder 412 is fixedly connected to the corresponding heating cover 42. By extending the telescopic section of the hydraulic cylinder 412, the heating cover 42 moves towards the screw.

[0047] See Figure 1 , Figure 5 , Figure 6 and Figure 7 The friction mechanism 5 includes several bases 52 arranged at equal intervals on the lower left side of the screw via a drive assembly 51. Several grinding blocks 54 arranged in a matrix on the bases 52 via a connecting assembly 53 and used to generate heat through friction with the screw.

[0048] During testing, the rotating screw blades are continuously pushed to the left, and the grinding block 54 is moved synchronously through the connecting component 53. This causes the rotating screw blades to periodically come into physical contact with the lower grinding block 54. On the one hand, the screw blades are heated by friction through physical friction. On the other hand, the periodic contact between the grinding block 54 and the screw blades simulates the transient radial thermal pulse that the material exerts on the screw during operation.

[0049] At the same time, the resistance of the grinding block 54 to the screw blades causes the screw blades to be subjected to the coupling effect of mechanical stress and frictional heat, thereby further simulating the actual working conditions of the screw and testing the thermal expansion performance of the screw.

[0050] To facilitate continuous contact between the grinding block 54 and the screw blades, the present invention is designed with the following structure: (Continue reading) Figure 1 , Figure 5 , Figure 6 and Figure 7 The drive assembly 51 includes a transmission structure fixedly installed on the base 1. The transmission structure is fixedly connected to the base 52 and drives the base 52 to move cyclically through the transmission structure.

[0051] The conveying structure in this embodiment includes a fixed frame fixedly installed on the upper part of the base 1. A high-temperature resistant metal conveyor belt is rotatably mounted on the fixed frame. The conveyor belt is fixedly connected to the base 52. During testing, the screw rotates continuously and the screw blades push to the left continuously. Thus, the conveyor belt drives each base 52 to move synchronously and in the same direction according to the pushing speed of the screw blades, so that the grinding blocks 54 on each base 52 can make stable contact with the screw blades and generate heat through friction on the screw.

[0052] To accommodate different screws, allowing the grinding block 54 to adaptively conform to the screw blades, the present invention designs the following structure: (See attached diagram) Figure 5 , Figure 6 and Figure 7 The connecting component 53 includes an arc-shaped frame 531 that is slidably connected to the base 52 along its length. A wobbling block 532 is slidably arranged on the arc-shaped frame 531 along its arc trajectory. The grinding block 54 is movably connected to the wobbling block 532, so that the wobbling block 532 can rotate adaptively within a certain angle, thereby making the grinding block 54 fit against the blade of the screw. A cylinder 533 is fixedly installed on the base 52, and the telescopic section of the cylinder 533 is fixedly connected to the corresponding arc-shaped frame 531.

[0053] During testing, the swaying block 532, which rotates to the upper part of the conveyor belt, is located between two adjacent parts of the lower part of the screw blade. Then, the telescopic section of the cylinder 533 extends, causing the cylinder 533 to push the arc frame 531 to move along the corresponding base 52. The arc frame 531, through the swaying block 532, drives the grinding block 54 on it to adaptively fit against the screw blade, so that the grinding block 54 stably contacts and rubs against the screw blade.

[0054] It should be noted that by controlling the pushing force of cylinder 533, the force of grinding block 54 against screw can be adjusted, thereby controlling the degree of frictional heat generation, so as to adapt to the simulation requirements of different material properties and working conditions, and improve the versatility and flexibility of the testing equipment.

[0055] It is worth noting that when the base 52 moves to the leftmost part of the conveyor belt, the conveyor belt drives the corresponding grinding block 54 to start rotating downwards. At this time, the telescopic section of the cylinder 533 gradually extends out of this position, causing the wobbling block 532 to move gradually, thereby preventing the wobbling block 532 from colliding with the screw blade. Similarly, when the wobbling block 532 moves to the rightmost part of the conveyor belt, the telescopic section of the cylinder 533 is fully retracted, which also prevents the wobbling block 532 from colliding with the screw blade, allowing the wobbling block 532 to move smoothly between two adjacent parts of the screw blade.

[0056] To further simulate the actual contact between the screw blades and the material accumulated at the bottom, the present invention designs the following structure: (See attached diagram) Figure 6 and Figure 7 Both sides of the swaying block 532 are equipped with helical springs, and both ends of the helical springs are fixedly connected to the arc frame 531. When the grinding block 54 is attached to the screw blade, the rotating screw can also move the grinding block 54 circumferentially through friction, so that the grinding block 54 drives the swaying block 532 to slide along the arc trajectory of the arc frame 531. This can simulate the situation of the screw moving the material accumulated at the bottom when it rotates, making the contact mode between the grinding block 54 and the screw blade closer to the actual interaction process between the material and the screw, further restoring the complex mechanical and thermal environment in the actual working conditions, thereby ensuring that the thermal expansion test results are more realistic and have engineering reference value.

[0057] See Figure 1 , Figure 2 and Figure 3 The detection mechanism 3 includes three sets of rangefinders 31 arranged on the upper part of the screw and located on the left, middle and right sides of the screw respectively. The detection data of the three sets of rangefinders 31 are compared to determine the degree of expansion, runout and bending of the screw. The detection mechanism 3 also includes a support beam 32 fixedly installed on the base 1. The support beam 32 is slidably connected to the rangefinders 31. There are two rangefinders 31 in each set. In the initial state, one of the rangefinders 31 in each set corresponds to the screw spindle and the other corresponds to the screw blade.

[0058] The rangefinder 31 in this invention uses a commonly used laser rangefinder sensor to accurately detect the outer diameter data of the screw in a non-contact manner.

[0059] Before testing, the operator manually slides the three sets of rangefinders 31, positioning them on the left, middle, and right sides of the screw, respectively. Simultaneously, one rangefinder 31 aligns with the screw spindle, and the other with the screw blade. During the screw rotation test, the rangefinders 31 measure the screw distance in real time, and the distance measurement data from the three sets of rangefinders 31 is uploaded to the host computer.

[0060] It should be noted that during the rotation of the screw, the rangefinder 31 measures the distance of the screw blade at the corresponding position once for each rotation of the screw. During the remaining rotation angles, the rangefinder 31 detects the screw spindle. If, within the specified detection time, the distance measurement data of one of the rangefinders 31 exceeds a certain value of its initial data, it can be determined that the expansion of the screw exceeds the calibration range, and the thermal expansion performance of the screw is deemed unqualified.

[0061] The specific method for the above judgment is as follows: before the test, rotate the screw one revolution and record the outer diameter value of the screw at each angle in the initial state through the host computer. During the test, when the change in the outer diameter value at a certain angle exceeds a certain standard, it is judged that the thermal expansion performance of the screw is unqualified. This test result indicates that the screw has excessive thermal expansion, that is, the screw may directly rub against the barrel or even jam during actual use.

[0062] If the difference between the distance measurement data of the middle group of rangefinders 31 and the distance measurement data of the other two groups of rangefinders 31 exceeds a certain value, it can be determined that the thermal bending degree of the screw exceeds the calibration range. For example, when the screw rotates to a certain angle, the difference between the largest value of the corresponding screw spindle and the smallest value of the corresponding screw spindle among the three groups of rangefinders 31, if the result exceeds the set standard, it is determined that the thermal expansion performance of the screw is unqualified.

[0063] At the same time, if the largest value of the corresponding screw blade in the three sets of rangefinders 31 is subtracted from the smallest value of the corresponding screw blade, and the result exceeds the set standard, it is also judged that the thermal expansion performance of the screw is unqualified. This test result indicates that the screw has thermal bending, that is, the screw axis deviation exceeds the standard value.

[0064] If, when the screw rotates one revolution, the maximum value of the distance measuring screw spindle of any one of the three sets of distance measuring instruments 31 minus the minimum value of its distance measuring screw spindle exceeds the set standard, it is determined that the thermal expansion performance of the screw is unqualified. This test result indicates that there is a local offset at the same cross-section position of the screw, causing the dynamic balance of the screw to fail. In actual use, this will result in excessive vibration and noise in the extruder.

[0065] Although this invention adds structures such as a heating cover 42, grinding block 54, and rangefinder 31 to the traditional method, increasing the initial investment in basic costs, it can simulate the temperature gradient, physical contact friction heat generation, and transient radial thermal pulse of the screw under actual working conditions, making the detection process more closely resemble the complex mechanical and thermal environment in actual working conditions. At the same time, by using three sets of rangefinders 31 to monitor the left, middle, and right sides of the screw in real time, it can comprehensively obtain the degree of expansion, runout, and bending of the screw. The detection results are more realistic and have engineering reference value, thus quickly balancing the initial investment and providing reliable data support for the structural optimization design of the screw and the stable operation of the extruder.

[0066] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0067] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A screw testing device for an extruder, comprising a base and a drive assembly for limiting the screw and driving it to rotate, characterized in that, The base is equipped with a detection mechanism for detecting the outer diameter of the screw, a heating mechanism for radiant heating of a local section of the screw shaft, and a friction mechanism for simulating the physical contact and friction of accumulated materials with the screw. The detection mechanism includes three sets of rangefinders arranged on the upper part of the screw and located on the left, middle and right sides of the screw respectively. The detection data of the three sets of rangefinders are compared to determine the degree of expansion, runout and bending of the screw. The heating mechanism includes two heating covers that are mounted on the front and rear sides of the screw via movable components. The two heating covers work together to locally heat a portion of the screw shaft, simulating the temperature gradient in the actual working condition of the screw. The friction mechanism includes several bases arranged at equal intervals on the lower left side of the screw via a drive assembly. Several grinding blocks arranged in a matrix on the bases via a connecting assembly are used to generate heat through friction in contact with the screw. By using a heating hood to simulate a temperature gradient and grinding blocks to simulate physical contact and frictional heat generation, the rangefinder can perform thermal expansion detection on the screw under simulated actual working conditions.

2. The extruder screw testing device according to claim 1, characterized in that, The detection mechanism also includes a support beam fixedly installed on the base, and the support beam is slidably connected to the rangefinder in the left and right directions.

3. The extruder screw testing device according to claim 1, characterized in that, Each group of rangefinders consists of two instruments. In the initial state, one rangefinder corresponds to the screw spindle and the other corresponds to the screw blade.

4. The extruder screw testing device according to claim 1, characterized in that, The movable component includes a movable frame that is slidably mounted on the base, the movable frame being slidably connected to the heating cover in the front and back, and the base being provided with a screw drive structure for driving the movable frame to move left and right.

5. The extruder screw testing device according to claim 4, characterized in that, The movable component also includes two hydraulic cylinders fixedly mounted on the movable frame, with the telescopic sections of the hydraulic cylinders fixedly connected to the corresponding heating covers.

6. The extruder screw testing device according to claim 1, characterized in that, The drive assembly includes a transmission structure fixedly installed on the base. The transmission structure is fixedly connected to the base and drives the base to move cyclically through the transmission structure.

7. The extruder screw testing device according to claim 1, characterized in that, The connecting component includes an arc-shaped frame that is slidably connected to the base along its length, and a wobbling block is slidably disposed on the arc-shaped frame along its arc trajectory.

8. The extruder screw testing device according to claim 7, characterized in that, The swaying block is equipped with helical springs on both the front and rear sides, and both ends of the helical springs are fixedly connected to the arc-shaped frame.

9. The extruder screw testing device according to claim 7, characterized in that, The grinding block and the wobbling block are movably connected, so that the wobbling block adaptively fits onto the screw blades.

10. The extruder screw testing device according to claim 1, characterized in that, A cylinder is fixedly installed on the base, and the telescopic section of the cylinder is fixedly connected to the corresponding arc-shaped frame.

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