A device for testing the performance of extruder screws

Abstract

The present invention relates to the field of extruder testing equipment, and specifically to an extruder screw performance testing device, comprising a base plate, a fixture for driving the screw to rotate is provided on the base plate, a sliding frame is provided on the base plate for sliding left and right, a detection mechanism is provided on the sliding frame, and the device further comprises a simulation mechanism for simulating real working conditions. The present invention adopts a locking assembly to connect a linkage cylinder with the screw for rotation, and utilizes the vibration characteristics of the screw rotation when the linkage cylinder has a coaxiality difference, and a distance sensor on the sliding frame monitors the displacement of the linkage cylinder in real time, thereby accurately judging the coaxiality deviation of the screw, being able to directly capture the axis offset under dynamic conditions, significantly improving the detection sensitivity, and adopting a linkage assembly to control the centrifugal block to dynamically simulate the material offset structure. The linkage assembly controls the centrifugal block to extend when it rotates to the lower part of the screw through a magnetic ring, and utilizes centrifugal force to simulate the load condition when the material is accumulated and offset at the lower part of the screw.

Description

Technical Field

[0001] The invention relates to the field of extruder testing equipment, in particular to an extruder screw performance testing device. Background Art

[0002] As a key equipment for material processing in the food, feed and chemical industries, the core function of the extruder is to expand and shape the material through high temperature and high pressure. The screw, as the core component of the extruder, is usually composed of spiral blades and a shaft, and is responsible for conveying, extruding and shearing the material. The structural accuracy of the screw directly affects the working efficiency and product quality of the extruder. Among them, coaxiality is an important indicator to measure its performance. If the coaxiality of the screw is insufficient, it will affect the life of the equipment and production safety. Therefore, accurate detection of the coaxiality of the screw is a necessary prerequisite to ensure the efficient and stable operation of the extruder.

[0003] Currently, most screw coaxiality detection methods on the market use rotation testing. Specifically, the two ends of the screw are fixed with a clamp, driven to rotate, and the radial runout is measured using a displacement sensor or laser rangefinder to indirectly evaluate the coaxiality. However, this detection process only focuses on the performance of the screw in the idling state and does not consider the impact of complex loads on coaxiality in actual working conditions.

[0004] The main shortcoming of existing detection methods is that they cannot simulate the dynamic load conditions in real production environments. For example, when the material is stuck, the screw is locally subjected to asymmetric resistance, resulting in increased axial deviation. Traditional detection devices cannot reproduce such transient impacts. In addition, the offset of material conveying will form uneven radial loads, further affecting the coaxial stability. However, existing technologies lack the ability to simulate such offset working conditions.

[0005] The above problems lead to significant differences between the test results and the actual operating performance, making it difficult to comprehensively evaluate the applicability and reliability of the screw. Therefore, there is an urgent need for a testing device that can simulate real working conditions to more accurately reflect the coaxiality performance of the screw under complex loads. Summary of the Invention

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a performance testing device for an extruder screw, comprising a base plate, a clamp for driving the screw to rotate is provided on the base plate, a sliding frame is provided on the base plate for sliding left and right, and a detection mechanism for detecting the coaxiality of the screw is provided on the sliding frame. The device also includes a simulation mechanism for simulating real working conditions.

[0007] The detection mechanism includes two sliding members arranged symmetrically front and back on a sliding frame that slide up and down. A linkage cylinder is set between the two sliding members for sliding back and forth together. A locking assembly for locking the screw is set inside the linkage cylinder. Distance sensors are fixedly installed on the upper front end side of the sliding frame and the front side of the front sliding member.

[0008] The simulation mechanism includes a rotating ring rotatably arranged outside the linkage cylinder, and an insertion rod for inserting into between the spiral blades of the screw is arranged on the rotating ring through a trigger component. The simulation mechanism also includes three centrifugal blocks arranged through the linkage component.

[0009] Preferably, coil springs are provided between the upper and lower sides of the sliding member and the sliding frame, and between the front and rear sides of the linkage cylinder and the sliding members at corresponding positions.

[0010] Preferably, the locking assembly includes a rotating member rotatably arranged on the inner side of the linkage cylinder, and a plurality of abutment blocks are arranged at equal intervals along the circumference of the rotating member and slide along the radial direction of the rotating member.

[0011] Preferably, an end face threaded disk is rotatably provided on the left side of the linkage cylinder, the end face threaded disk is threadedly connected to the abutment block, and two locking screws are symmetrically provided on the end face threaded disk.

[0012] Preferably, the linkage assembly includes a connecting cylinder fixedly mounted on the right side of the rotating member, three centrifugal blocks are slidingly connected to the connecting cylinder at equal intervals along the circumference of the connecting cylinder, and a magnetic ring is provided inside the linkage cylinder for sliding left and right, with an arc groove provided on the magnetic ring.

[0013] Preferably, the angles between the radial directions of the centrifugal blocks and the connecting cylinder are different, a hydraulic push rod is fixedly mounted on the lower side of the linkage cylinder, and the telescopic section of the hydraulic push rod is fixedly connected to the magnetic ring.

[0014] Preferably, the trigger assembly includes a moving part that is slid left and right on the rotating ring, a push spring is provided between the moving part and the rotating ring, the right part of the moving part is connected to the insertion rod for sliding up and down, a connecting plate is provided on the rotating ring for sliding along its radial direction, an inclined panel is fixedly installed on the right part of the connecting plate, and the inclined surface of the inclined panel is slidably connected to the upper side of the insertion rod.

[0015] Preferably, a compression spring is provided between the connecting plate and the rotating ring, a snap-fit piece is provided on the rotating ring for sliding left and right, an inclined surface is provided on the left side of the snap-fit piece, a cylinder is fixedly installed on the left side of the connecting plate, and a wedge block is fixedly installed on the telescopic section of the cylinder.

[0016] Preferably, a locking block is provided on the rotating ring for radial sliding, and the locking block is fixedly connected to the rotating ring by bolts. Slots for inserting the locking block are provided at equal intervals along the circumference of the right side of the linkage cylinder.

[0017] Preferably, an adjusting screw is rotatably provided inside the base plate, and the adjusting screw is threadedly connected to the sliding frame.

[0018] The beneficial effects of the present invention are as follows: 1. The present invention adopts a locking assembly to rotationally connect the linkage cylinder and the screw, and utilizes the vibration characteristics of the screw rotation when the linkage cylinder has a coaxiality difference. The distance sensor on the sliding frame monitors the displacement of the linkage cylinder in real time, thereby accurately judging the coaxiality deviation of the screw, and can directly capture the axis center offset under dynamic conditions, significantly improving the detection sensitivity.

[0019] 2. The present invention drives the insertion rod to be inserted between the spiral blades of the screw through the trigger component, forcing the screw to stop running, simulating the impact when the material is stuck. At the same time, the insertion rod cooperates with the inclined surface of the inclined plate to push the screw along the radial direction of the screw, reproducing the squeezing effect of the stuck material on the screw, thereby detecting the impact of the material stuck on the coaxiality of the screw.

[0020] 3. The present invention adopts a linkage component to control the centrifugal block to dynamically simulate the material offset structure. The linkage component controls the centrifugal block to extend when it rotates to the lower part of the screw through a magnetic ring, and uses centrifugal force to simulate the load condition when the material is accumulated and offset at the lower part of the screw. Different centrifugal blocks can be selected to extend by sliding the magnetic ring, thereby generating differentiated centrifugal force distribution, further simulating the axial pressure caused by material offset, and comprehensively evaluating the coaxiality stability of the screw under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the sliding frame, linkage cylinder, connecting plate and end face threaded disk in the present invention.

[0024] Figure 3 It is a cross-sectional view of the linkage cylinder, rotating member, abutment block and end face threaded disk in the present invention.

[0025] Figure 4 It is a cross-sectional view of the linkage cylinder, the connecting cylinder, the rotating member and the magnetic ring in the present invention.

[0026] Figure 5 It is a cross-sectional view of the centrifugal block and the connecting cylinder in the present invention.

[0027] Figure 6 It is a partial structural diagram of the linkage cylinder, rotating ring, moving part and inclined plate in the present invention.

[0028] Figure 7 It is a partial cross-sectional view of the rotating ring, the snap fitting, the cylinder and the wedge block in the present invention.

[0029] In the figure: 1. Base plate; 2. Clamp; 3. Sliding frame; 4. Detection mechanism; 5. Simulation mechanism; 41. Sliding part; 42. Linkage cylinder; 43. Locking assembly; 44. Distance sensor; 45. Adjusting screw; 51. Rotating ring; 52. Trigger assembly; 53. Insert rod; 54. Linkage assembly; 55. Centrifugal block; 431. Rotating part; 432. Abutment block; 433. End face threaded disk; 511. Locking block; 521. Moving part; 522. Connecting plate; 523. Inclined plate; 524. Fastener; 525. Cylinder; 526. Wedge block; 541. Connecting cylinder; 542. Magnetic ring; 543. Hydraulic push rod. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in detail. The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or in the product specifications shall be followed.

[0031] See Figure 1 and Figure 2 A device for testing the performance of an extruder screw comprises a base plate 1, a clamp 2 for driving the screw to rotate is provided on the base plate 1, a sliding frame 3 is provided on the base plate 1 for sliding left and right, a detection mechanism 4 for detecting the coaxiality of the screw is provided on the sliding frame 3, and the device also comprises a simulation mechanism 5 for simulating real working conditions.

[0032] It should be noted that the clamp 2 includes two supports arranged on the base plate 1, the right support is fixedly connected to the base plate 1, and the left support is connected to the base plate 1 for left and right sliding. A three-jaw chuck is rotatably provided on the side where the supports are close to each other, and an asynchronous motor is fixedly installed on the right side surface of the right support. The output shaft of the asynchronous motor is fixedly connected to the three-jaw chuck at the corresponding position, and the left support is driven by the existing slide rail power assembly to slide left and right on the base plate 1.

[0033] When the coaxiality of the screw needs to be tested, first adjust the position of the left support left and right according to the length of the screw, then place the screw between the two supports, and at the same time make the screw pass through the detection mechanism 4, then clamp the two ends of the screw through the three-jaw chuck on the support, and then start the asynchronous motor to drive the screw to the working speed through the three-jaw chuck, monitor the vibration of the screw in real time through the detection mechanism 4, and then use the simulation mechanism 5 to simulate the impact of material jamming and material offset on the coaxiality of the screw.

[0034] Continue reading Figure 1 and Figure 2The detection mechanism 4 includes two sliding members 41 symmetrically arranged front and back on the sliding frame 3 that slide up and down. A linkage cylinder 42 is set between the two sliding members 41 for sliding back and forth together. A locking component 43 for locking the screw is set inside the linkage cylinder 42. A distance sensor 44 is fixedly installed on the upper front end side of the sliding frame 3 and the front side of the front sliding member 41.

[0035] Continue reading Figure 1 and Figure 2 Coil springs are provided between the upper and lower sides of the sliding member 41 and the sliding frame 3, and between the front and rear sides of the linkage cylinder 42 and the sliding member 41 at the corresponding position. An adjusting screw 45 is rotatably provided inside the base plate 1, and the adjusting screw 45 is threadedly connected to the sliding frame 3.

[0036] When the screw is fixedly connected between the two supports, the screw passes through the interior of the linkage cylinder 42, and then the operator manually rotates the adjusting screw 45, so that the adjusting screw 45 drives the linkage cylinder 42 to slide left and right to the middle position of the screw through the sliding frame 3, thereby facilitating the coaxiality test of the middle position of the screw.

[0037] In the initial state, the coil springs on the upper and lower sides of the sliding member 41 push the sliding member 41 to the middle position of the sliding frame 3 through their elastic force, and the coil springs on the front and rear sides of the linkage cylinder 42 push the linkage cylinder 42 to the middle position between the two sliding members 41 through their elastic force, so that the linkage cylinder 42 is located in a coaxial position with the three-jaw chuck, and then the linkage cylinder 42 is arranged coaxially with the screw.

[0038] See Figure 1 、 Figure 2 and Figure 3 The locking assembly 43 includes a rotating member 431 rotatably arranged on the inner side of the linkage cylinder 42, and a plurality of abutment blocks 432 sliding radially along the rotating member 431 are arranged at equal intervals along its circumference inside the rotating member 431. An end threaded disk 433 is rotatably arranged on the left side of the linkage cylinder 42, and the end threaded disk 433 is threadedly connected to the abutment block 432. Two locking screws are symmetrically arranged on the end threaded disk 433.

[0039] When the linkage cylinder 42 is arranged coaxially with the screw, the screw is inserted into the interior of the rotating member 431 and is in its coaxial position. Then the operator manually rotates the end threaded disk 433, so that the end threaded disk 433 rotates relative to the rotating member 431, so that the end threaded disk 433 drives the abutment block 432 to move synchronously in the direction close to the axis of the rotating member 431, and then the abutment block 432 is abutted and clamped on the outside of the screw, fixing the rotating member 431 and the screw together. Then the operator manually rotates the two locking screws so that the locking screws lock the end threaded disk 433 and the rotating member 431 into a whole.

[0040] In this embodiment, Figure 3 and Figure 4 As shown, a number of insertion holes are provided on the outer surface of the rotating member 431 at equal intervals along its circumference, and an arc groove is provided on the linkage cylinder 42 at the position corresponding to the insertion holes, which runs through the inner and outer walls. When the operator rotates the end face threaded disk 433, the handheld insertion rod is inserted through the arc groove into the inside of the insertion hole at the corresponding position, thereby limiting the relative rotation angle of the rotating member 431 and the linkage cylinder 42, making it easier for the end face threaded disk 433 to drive the abutment block 432 to move.

[0041] When the abutment block 432 is clamped on the outside of the screw, the operator starts the asynchronous motor to drive the screw to rotate, and the screw drives the rotating member 431 to rotate synchronously through the abutment block 432, so that the vibration of the screw during rotation is transmitted to the linkage cylinder 42 through the rotating member 431, causing the linkage cylinder 42 to displace along the radial direction of the screw, and at the same time, the linkage cylinder 42 drives the two sliding members 41 to displace up and down.

[0042] At the same time, the distance sensor 44 monitors the front-to-back displacement of the linkage cylinder 42 and the up-and-down displacement of the rotating member 431 in real time. When the monitoring value of any distance sensor 44 exceeds the standard value, the coaxiality is judged to be unqualified.

[0043] See Figure 1 、 Figure 2 、 Figure 4 and Figure 5 The simulation mechanism 5 includes a rotating ring 51 rotatably arranged on the outside of the linkage cylinder 42. The rotating ring 51 is provided with an insertion rod 53 for inserting into between the spiral blades of the screw through a trigger component 52. The simulation mechanism 5 also includes three centrifugal blocks 55 arranged through a linkage component 54.

[0044] See Figure 1 、 Figure 3 、 Figure 4 and Figure 5 The linkage assembly 54 includes a connecting tube 541 fixedly installed on the right side of the rotating member 431, and three centrifugal blocks 55 are slidably connected to the connecting tube 541 at equal intervals along the circumference. A magnetic ring 542 is provided inside the linkage tube 42 for sliding left and right. The magnetic ring 542 is provided with an arc groove, which is located at the lower part of the magnetic ring 542 itself.

[0045] Continue reading Figure 3 、 Figure 4 and Figure 5 The angles between the three centrifugal blocks 55 and the radial direction of the connecting cylinder 541 are different. A hydraulic push rod 543 is fixedly installed on the lower side of the linkage cylinder 42, and the telescopic section of the hydraulic push rod 543 is fixedly connected to the magnetic ring 542.

[0046] It should be noted that five groups of strong magnets are arranged on the inner side surface of the magnetic ring 542 at equal intervals along its axial direction. Each group is composed of several strong magnets arranged along its circumference. The strong magnets in each group are closely arranged with each other, and no strong magnets are arranged at the position of the arc groove. Except for the group of strong magnets in the middle, the other four groups of strong magnets are arranged on both sides of the arc groove. The strong magnets are not shown in the figure.

[0047] It should be noted that, in the initial state, the three centrifugal blocks 55 are completely retracted inside the connecting tube 541, and the three centrifugal blocks 55 are completely engaged with the connecting tube 541, so that the centrifugal forces at each position are the same when the connecting tube 541 rotates at this time. The three centrifugal blocks 55 are distributed in sequence from left to right, the centrifugal blocks 55 on the right are arranged gradually tilted to the right from the inside to the outside, the centrifugal blocks 55 on the left are arranged gradually tilted to the left from the inside to the outside, and the centrifugal blocks 55 in the middle are arranged along the radial direction of the connecting tube 541.

[0048] In the initial state, a group of strong magnets in the middle corresponds to the position of the middle centrifugal block 55. When the screw starts to rotate, the rotating member 431 drives the three centrifugal blocks 55 to rotate synchronously through the connecting tube 541. The left and right centrifugal blocks 55 are still in a state of being retracted inside the connecting tube 541 under the push of a group of strong magnets in the corresponding positions.

[0049] When the centrifugal block 55 in the middle rotates to the arc groove position of the magnetic ring 542, there is no strong magnet on the arc groove to push the centrifugal block 55 in the middle. Therefore, the centrifugal block 55 in the middle extends to the outside of the connecting tube 541 under the action of centrifugal force and its own gravity. At this time, the centrifugal block 55 is still inside the magnetic ring 542, so that the extra extended centrifugal block 55 simulates the offset material. Under the condition of material offset, the coaxiality of the screw is tested.

[0050] When the centrifugal block 55 in the middle rotates to a position that does not correspond to the arc groove, the strong magnet pushes the centrifugal block 55 in the middle to retract into the inside of the connecting cylinder 541, thereby intermittently simulating the state in which the bias direction of the material is downward, effectively fitting the actual working condition in which the material accumulates at the bottom of the screw under the action of gravity.

[0051] Subsequently, the telescopic section of the hydraulic push rod 543 is adjusted to move left and right, causing it to drive the magnetic ring 542 to move left and right, thereby making the arcuate slots on the magnetic ring 542 correspond to different centrifugal blocks 55. When the arcuate slots correspond to tilted centrifugal blocks 55, the principle remains the same: when the tilted centrifugal blocks 55 extend, their centrifugal force components exert pressure on the axial direction of the screw, further simulating the complex working conditions where material offset causes axial pressure, and comprehensively evaluating the coaxial stability of the screw under complex working conditions. The five sets of strong magnets ensure that whether the centrifugal blocks 55 in the center, left, or right correspond to the arcuate slots, there are corresponding strong magnets acting on the centrifugal blocks 55.

[0052] See Figure 1 、 Figure 2 、 Figure 6 and Figure 7 The trigger assembly 52 includes a moving part 521 that is slidingly arranged on the rotating ring 51, and a push spring is arranged between the moving part 521 and the rotating ring 51. The right part of the moving part 521 is connected to the insertion rod 53 for sliding up and down. A connecting plate 522 is provided on the rotating ring 51 for sliding along its radial direction. An inclined panel 523 is fixedly installed on the right part of the connecting plate 522. The inclined surface of the inclined panel 523 is slidingly connected to the upper side of the insertion rod 53.

[0053] See Figure 6 and Figure 7 A compression spring is provided between the connecting plate 522 and the rotating ring 51, a fastener 524 is provided on the rotating ring 51 for sliding left and right, an inclined surface is provided on the left side of the fastener 524, a cylinder 525 is fixedly installed on the left side of the connecting plate 522, a wedge block 526 is fixedly installed on the telescopic section of the cylinder 525, and a tension spring is provided between the fastener 524 and the rotating ring 51.

[0054] In the initial state, the pushing spring pushes the moving part 521 to the left by its own elastic force, so that the moving part 521 drives the insertion rod 53 to a position close to the rotating ring 51, and the upper end of the insertion rod 53 is located on the left part of the inclined plate 523. The telescopic section of the cylinder 525 is in an extended state, so that the cylinder 525 drives the wedge block 526 to press downward against the inclined surface of the latch 524, thereby causing the wedge block 526 to push the latch 524 to the right and stretch the tension spring. At the same time, the reaction force of the latch 524 on the cylinder 525 pushes the connecting plate 522 in the direction away from the rotating ring 51.

[0055] When it is necessary to simulate the jamming of material in the screw, the telescopic section of the cylinder 525 is quickly retracted so that the wedge block 526 no longer supports the latch 524. While the tension spring pulls the latch 524 to the left by its own elastic force, the compression spring pushes the connecting plate 522 toward the axis of the rotating ring 51, so that the connecting plate 522 pushes the insertion rod 53 downward through the inclined plate 523, thereby allowing the insertion rod 53 to be inserted downward between the spiral blades of the screw.

[0056] If the insertion rod 53 is not directly against the spiral blades, but against the side walls of the spiral blades, the rotating screw drives its spiral blades to rotate until they are no longer in contact with the insertion rod 53, and the insertion rod 53 can still be inserted downward between the spiral blades of the screw. Then the snap member 524 fixes the connecting plate 522 and the rotating ring 51 together, and then the spiral blades of the screw push the insertion rod 53 to move to the right, and the insertion rod 53 drives the moving part 521 to move synchronously and quickly compresses the push spring.

[0057] By pushing the rapid compression of the spring, the rapid jamming of the material is simulated, and when the screw pushes the insertion rod 53 to the right, the insertion rod 53 moves along the inclined plate 523 toward the direction close to the screw axis. When the insertion rod 53 rests on the screw, the insertion rod 53 can no longer move, so that the insertion rod 53 blocks the spiral blades of the screw, thereby jamming the screw, thereby simulating the situation where the screw stops rotating due to material jamming. At the same time, the screw is pushed in the radial direction of the screw to reproduce the squeezing effect of material jam on the screw, thereby detecting the influence of material jam on the coaxiality of the screw.

[0058] Then, the telescopic section of the cylinder 525 is extended, causing the wedge block 526 to push the latch 524 to the right, so that the connecting plate 522 and the rotating ring 51 are no longer fixed together. Then, the cylinder 525 drives the connecting plate 522 in the opposite direction to move to the initial position by pushing the latch 524, so that the insertion rod 53 also moves to the initial position. Then, the screw is rotated again, and the screw is subjected to multiple material jamming tests.

[0059] See Figure 6 A locking block 511 is provided on the rotating ring 51 for sliding along its radial direction. The locking block 511 is fixedly connected to the rotating ring 51 by bolts. Slots for inserting the locking block 511 are provided at equal intervals along the circumference of the right side of the linkage cylinder 42.

[0060] The operator can pre-select the direction in which the insertion rod 53 pushes the screw by rotating the rotating ring 51 in advance, inserting the locking block 511 into the corresponding slot, and then fixing the locking block 511 to the rotating ring 51 by bolts, thereby simulating different stuck positions of the material in the screw, and then conducting multiple tests. Whether the coaxiality is qualified is determined by whether the monitoring value of the distance sensor 44 (this is existing technology and will not be described in detail here) exceeds the standard value.

[0061] When the present invention performs a coaxiality test on the screw of the extruder: the first step is to adjust the position of the left support left and right according to the length of the screw, then place the screw between the two supports, and clamp the two ends of the screw by the three-jaw chuck on the support.

[0062] In the second step, the operator manually rotates the adjusting screw 45 so that the adjusting screw 45 drives the linkage cylinder 42 to slide left and right to the middle position of the screw through the sliding frame 3, thereby facilitating the coaxiality test of the middle position of the screw.

[0063] In the third step, the operator manually rotates the end threaded disk 433 so that the abutment block 432 abuts and clamps against the outside of the screw, fixing the rotating part 431 and the screw together. Then the operator manually rotates the two locking screws so that the locking screws lock the end threaded disk 433 and the rotating part 431 into a whole.

[0064] In the fourth step, the operator starts the asynchronous motor to drive the screw to rotate. The vibration of the screw is transmitted to the linkage cylinder 42 through the rotating member 431. The distance sensor 44 monitors the front and rear displacement of the linkage cylinder 42 and the up and down displacement of the rotating member 431 in real time.

[0065] In the fifth step, the rotating member 431 drives the three centrifugal blocks 55 to rotate synchronously. When the middle centrifugal block 55 rotates to the position of the arc groove, the middle centrifugal block 55 extends to the outside of the connecting tube 541, simulating the offset material. In the case of offset material, the coaxiality of the screw is tested.

[0066] In the sixth step, the telescopic section of the hydraulic push rod 543 is extended to extend the inclined centrifugal block 55, further simulating the complex working condition where the material offset causes axial pressure, and comprehensively evaluating the coaxiality stability of the screw under complex working conditions.

[0067] Step 7: Quickly contract the telescopic section of the cylinder 525 so that the insertion rod 53 is inserted downward between the spiral blades of the screw. The spiral blades of the screw push the insertion rod 53 to the right, and the insertion rod 53 quickly compresses the push spring to simulate the rapid jamming of the material.

[0068] In the eighth step, the insertion rod 53 is moved along the inclined plate 523 toward the direction close to the screw axis until it abuts against the screw, so that the insertion rod 53 stops the screw, thereby simulating the situation where the screw stops rotating due to material jamming. At the same time, the screw is pushed along the radial direction of the screw to reproduce the squeezing effect of the material jam on the screw, thereby detecting the influence of the material jam on the coaxiality of the screw.

[0069] In the ninth step, the telescopic section of the cylinder 525 is then extended to move the insertion rod 53 to the initial position, and the screw is then rotated again, and the screw is subjected to multiple material jam tests. When the monitoring value of any distance sensor 44 exceeds the standard value, the coaxiality is judged to be unqualified.

[0070] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, which are still covered by the scope of protection of the present invention.

Claims

1. A device for testing the performance of an extruder screw, comprising a base plate, on which a fixture for driving the screw to rotate is provided, characterized in that: A sliding frame is provided on the base plate for sliding left and right, and a detection mechanism for detecting the coaxiality of the screw is provided on the sliding frame. The device also includes a simulation mechanism for simulating real working conditions; The detection mechanism includes two sliding members arranged symmetrically front and back on a sliding frame that slide up and down. A linkage cylinder is provided between the two sliding members so as to slide back and forth together. A locking assembly for locking the screw is provided inside the linkage cylinder. Distance sensors are fixedly installed on the upper front end of the sliding frame and the front side of the front sliding member. The simulation mechanism includes a rotating ring rotatably arranged outside the linkage cylinder, and an insertion rod for inserting into between the spiral blades of the screw is arranged on the rotating ring through a trigger component. The simulation mechanism also includes three centrifugal blocks arranged through the linkage component.

2. The extruder screw performance testing device according to claim 1, characterized in that: Coil springs are arranged between the upper and lower sides of the sliding member and the sliding frame, and between the front and rear sides of the linkage cylinder and the sliding members at corresponding positions.

3. The extruder screw performance testing device according to claim 1, characterized in that: The locking assembly comprises a rotating member rotatably provided with the inner side of a linkage cylinder, wherein a plurality of abutting blocks which slide along the radial direction of the rotating member are provided at equal intervals inside the rotating member along its circumference.

4. The extruder screw performance testing device according to claim 3, characterized in that: An end face threaded disc is rotatably provided on the left side of the linkage cylinder, the end face threaded disc is threadedly connected to the abutment block, and two locking screws are symmetrically provided on the end face threaded disc.

5. The extruder screw performance testing device according to claim 3, characterized in that: The linkage assembly includes a connecting cylinder fixedly installed on the right side of the rotating part, three centrifugal blocks are slidably connected to the connecting cylinder at equal intervals along the circumference of the connecting cylinder, and a magnetic ring is provided inside the linkage cylinder for sliding left and right, and an arc groove is opened on the magnetic ring.

6. The extruder screw performance testing device according to claim 5, characterized in that: The included angles between the radial directions of the centrifugal blocks and the connecting cylinder are different. A hydraulic push rod is fixedly installed on the lower side of the linkage cylinder, and the telescopic section of the hydraulic push rod is fixedly connected to the magnetic ring.

7. The extruder screw performance testing device according to claim 1, characterized in that: The trigger assembly includes a moving part that is slidingly arranged on a rotating ring, a push spring is arranged between the moving part and the rotating ring, the right part of the moving part is connected to the insertion rod for sliding up and down, a connecting plate is provided on the rotating ring for sliding along its radial direction, an inclined panel is fixedly installed on the right part of the connecting plate, and the inclined surface of the inclined panel is slidingly connected to the upper side of the insertion rod.

8. The extruder screw performance testing device according to claim 7, characterized in that: A compression spring is provided between the connecting plate and the rotating ring, a snap-fit piece is provided on the rotating ring for sliding left and right, an inclined surface is provided on the left side of the snap-fit piece, a cylinder is fixedly installed on the left side of the connecting plate, and a wedge block is fixedly installed on the telescopic section of the cylinder.

9. The extruder screw performance testing device according to claim 1, characterized in that: A locking block is provided on the rotating ring for sliding along its radial direction. The locking block is fixedly connected to the rotating ring by a bolt. Slots for inserting the locking block are provided at equal intervals along the circumference of the right side of the linkage cylinder.

10. The extruder screw performance testing device according to claim 1, characterized in that: An adjusting screw is rotatably provided inside the base plate, and the adjusting screw is threadedly connected to the sliding frame.

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