Abrasion test fixture

Abstract

The invention belongs to the technical field of wear tests, and discloses a wear test fixture. The wear test jig comprises a substrate used for installing a cylindrical first matching workpiece; one end of the valve needle is connected with the driving assembly, the other end of the valve needle penetrates through the first matching workpiece, and the driving assembly can drive the valve needle to reciprocate relative to the first matching workpiece; the supporting assembly is connected with the base plate and abuts against the valve needle, and an included angle is formed between the axis of the valve needle and the axis of the first matched workpiece. The abrasion test fixture can simulate the relative movement of the first matching workpiece and the valve needle, the friction degree between the valve needle and the flow guide sleeve in the test process is slightly larger than that between the valve needle and the flow guide sleeve in the actual working process, the test result is amplified, the comparison between the tested flow guide sleeves can be more obvious, and the test accuracy is improved. Therefore, a proper flow guide sleeve can be more accurately selected; the flow guide sleeve is selected according to a stricter standard, and it is guaranteed that the selected flow guide sleeve cannot be damaged within the preset service life range.

Description

Technical Field

[0001] The invention relates to the technical field of wear testing, and in particular to a wear testing tool. Background Art

[0002] Needle valves are widely used in hot runner systems. Needle valve hot runner systems include valve needles, hot nozzles, guide sleeves and hot runner plates. A runner is provided in the hot runner plate. One end of the runner is used to connect to the injection molding machine. A cylindrical guide sleeve is installed at the other end of the runner. The hot nozzle is connected to the guide sleeve so as to be connected to the hot runner plate. One end of the valve needle is connected to an external drive component, and the other end is penetrated by a guide sleeve and inserted into the hot nozzle. The drive component can drive the valve needle to reciprocate relative to the hot nozzle and the guide sleeve, so as to selectively open or block the glue outlet of the hot nozzle, thereby controlling the molten plastic melt to flow out of the glue outlet and be injected into the mold cavity to achieve injection molding of the mold.

[0003] The guide sleeve guides the movement of the valve needle and seals the flow path of the plastic melt. However, during the multiple reciprocating motions of the valve needle, the friction between the valve needle and the guide sleeve will cause wear of the guide sleeve, which will in turn affect the sealing performance of the needle valve hot runner system and the guiding accuracy of the valve needle. Therefore, it is necessary to select a guide sleeve with better wear resistance. The wear test in the prior art only involves the reciprocating friction motion between the guide sleeve and the valve needle, which cannot simulate the actual working scene. It is difficult to perform accurate quantitative testing when selecting the guide sleeve, and the method to make the comparison between the tested guide sleeves more obvious is to increase the number of frictions, which results in a long test time, high energy consumption of the test equipment, low test efficiency, and an inability to accurately select an appropriate guide sleeve.

[0004] Therefore, there is an urgent need for a wear test fixture to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a wear test fixture that can simulate the working scene of a guide sleeve to facilitate quantitative testing of the guide sleeve, and by forming an angle between the guide sleeve and the valve needle, the degree of wear is magnified, thereby making it more convenient and intuitive to select the guide sleeve.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A wear test fixture, comprising:

[0008] A base plate, the base plate being used for mounting a cylindrical first mating workpiece;

[0009] A valve needle and a drive assembly, one end of the valve needle is connected to the drive assembly, and the other end of the valve needle can penetrate the first matching workpiece, and the drive assembly can drive the valve needle to reciprocate relative to the first matching workpiece;

[0010] A support component is connected to the base plate, and the support component abuts against the valve needle, so that the axis of the valve needle forms an angle with the axis of the first matching workpiece.

[0011] Preferably, the support assembly comprises:

[0012] A longitudinal fixing plate, one end of which is connected to the base plate;

[0013] A transverse plate connected to the other end of the longitudinal fixed plate, the transverse plate comprising an abutting surface, the abutting surface abutting against the valve needle;

[0014] An adjusting member is capable of adjusting an angle of the transverse plate relative to the longitudinal fixing plate so as to adjust an inclination angle of the abutting surface.

[0015] Preferably, the longitudinal fixing plate is height-adjustable.

[0016] Preferably, the adjusting member comprises at least one adjusting gasket, which is arranged between the longitudinal fixing plate and the transverse plate so that the axis of the valve needle forms an angle with the axis of the first matching workpiece.

[0017] Preferably, the support assembly has an abutment surface, which is configured as a groove surface, and the circumferential surface of the valve needle abuts against the groove surface and slidably cooperates with the groove surface.

[0018] Preferably, a through hole is provided on the substrate, the valve needle passes through the through hole, and a countersunk hole is provided at one end of the through hole;

[0019] The first mating workpiece includes a main body and an end portion, wherein the cross-sectional area of ​​the end portion is larger than the cross-sectional area of ​​the main body;

[0020] The wear test fixture also includes an insert nut, which is sleeved on the main body and connected to the inner wall of the countersunk hole so that the end portion is pressed between the insert nut and the bottom surface of the countersunk hole.

[0021] Preferably, it is characterized in that the wear test fixture further comprises a heating component, and the heating component is laid on the substrate and can heat the substrate.

[0022] Preferably, the wear test fixture further comprises a temperature sensor, which is disposed on the substrate and can detect the temperature of the substrate.

[0023] Preferably, the support assembly includes a longitudinal fixing plate, a transverse plate and a mounting piece. The longitudinal fixing plate is connected to the base plate. The transverse plate and the mounting piece can be selectively installed at an end of the longitudinal fixing plate away from the base plate. The transverse plate is used to abut the valve needle, and the mounting piece is used to fix a second mating workpiece, and the valve needle passes through the second mating workpiece.

[0024] Preferably, the wear test fixture comprises at least two valve needles, the base plate can mount at least two first mating workpieces, each valve needle pair should be penetrated by one first mating workpiece, and the drive assembly can drive at least two valve needles to reciprocate.

[0025] Beneficial effects:

[0026] In the wear test fixture of the present invention, the valve needle penetrates the first mating workpiece installed on the substrate, and the driving component drives the valve needle to reciprocate relative to the first mating workpiece to simulate the actual working scene of the first mating workpiece, so that the process of selecting the first mating workpiece can be quantitatively tested, so as to select the first mating workpiece with better wear resistance; in addition, by arranging the support component, the axis of the valve needle and the axis of the first mating workpiece form an angle, so that the friction degree between the valve needle and the first mating workpiece during the test is slightly greater than the friction degree between the valve needle and the first mating workpiece during the actual working process. On the one hand, the test results are amplified, and the contrast between the tested first mating workpieces can be made more obvious, so as to more accurately select the appropriate first mating workpiece. On the other hand, the first mating workpiece is selected according to more stringent standards to ensure that the selected first mating workpiece will not be damaged within the predetermined service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a guide sleeve provided in an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the structure of a wear test fixture provided by an embodiment of the present invention;

[0029] Figure 3 It is a cross-sectional view of a wear test fixture provided in an embodiment of the present invention.

[0030] In the figure:

[0031] 1. Base plate; 11. Mounting groove; 12. Through hole; 121. Countersunk hole;

[0032] 2. Driving assembly; 21. Driving parts;

[0033] 3. Heating assembly; 31. Heating port; 32. Heating pipe;

[0034] 4. Support components;

[0035] 41. longitudinal fixing plate; 411. first longitudinal fixing plate; 412. second longitudinal fixing plate;

[0036] 42. transverse plate; 421. abutment surface;

[0037] 43. a first fastener; 44. a second fastener;

[0038] 5. Adjustment parts;

[0039] 6. Valve needle;

[0040] 7. first mating workpiece; 71. main body; 72. end portion;

[0041] 8. Insert nut. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] The present invention provides a wear test fixture, which can test the wear resistance of the first mating workpiece 7. The following description is made by taking the first mating workpiece 7 as a guide sleeve as an example. Figure 1 As shown, the guide sleeve is a cylindrical structure and includes a main body 71 and an end 72 arranged along the axial direction. The cross-sectional area of ​​the main body 71 is smaller than the cross-sectional area of ​​the end 72.

[0047] like Figure 2 As shown, the wear test fixture includes a substrate 1, a valve needle 6 and a drive assembly 2. The substrate 1 is used to install the first matching workpiece 7, one end of the valve needle 6 is connected to the drive assembly 2, and the other end is penetrated by the first matching workpiece 7. The drive assembly 2 can drive the valve needle 6 to reciprocate relative to the first matching workpiece 7, and then quantitative testing is performed in the process of selecting the first matching workpiece 7, so as to select the first matching workpiece 7 with better wear resistance.

[0048] like Figure 2 and Figure 3 As shown, the substrate 1 is provided with a through hole 12 along its thickness direction, the driving assembly 2 is arranged on one side of the substrate 1, and the first matching workpiece 7 is installed at the end of the through hole 12 away from the driving assembly 2. One end of the valve needle 6 is connected to the driving assembly 2, and the other end is penetrated by the through hole 12 and the first matching workpiece 7. The driving assembly 2 includes a driving member 21. In some embodiments, the driving member 21 can be an oil cylinder, an air cylinder or a linear motor, etc., as long as it can output linear motion and drive the valve needle 6 to reciprocate linear motion.

[0049] In some embodiments, the connection between the valve needle 6 and the driving member 21 can be a concave-convex fitting connection. When the driving member 21 is an oil cylinder, the oil cylinder includes a cylinder body and a piston. The piston can reciprocate in the cylinder body. A groove is provided at one end of the piston connected to the valve needle 6. One end of the valve needle 6 is also connected to a hanging platform with a cross-section larger than the valve needle 6, and the hanging platform is inserted into the groove. Optionally, the hanging platform is connected to the valve needle 6 by a fastener. In some embodiments, the cross-sectional area of ​​the hanging platform is larger than the cross-sectional area of ​​the through hole 12. During installation, the valve needle 6 passes through the substrate 1, and the hanging platform is located on one side of the substrate 1. When the hanging platform is close to the substrate 1, the valve needle 6 can be limited in the axial direction. In some embodiments, after the hanging platform is inserted into the groove, a fastener is provided at the connection between the hanging platform and the piston so that the valve needle 6 and the driving member 21 are more tightly connected. Specifically, the longitudinal section of the hanging platform is T-shaped, and the cross-section of the hanging platform can be circular or rectangular, which is not specifically limited here.

[0050] In other embodiments, the connection method between the valve needle 6 and the driving member 21 can also be a threaded connection. Other connection methods between the valve needle 6 and the driving member 21 are not described here. The driving member 21 can drive the valve needle 6 to reciprocate along the perforation direction.

[0051] like Figure 2 and Figure 3As shown, a countersunk hole 121 is provided at one end of the through hole 12 away from the driving assembly 2, and the wear test fixture further includes an insert nut 8, which is sleeved with the main body 71 of the first matching workpiece 7 and connected to the inner wall of the countersunk hole 121, so that the end 72 is pressed between the insert nut 8 and the bottom surface of the countersunk hole 121. Thus, the first matching workpiece 7 is fixed on the substrate 1 to prevent the position of the first matching workpiece 7 from shifting during the reciprocating movement of the valve needle 6 relative to the first matching workpiece 7. Optionally, an external thread is provided on the outer periphery of the insert nut 8, an internal thread is provided on the inner wall of the countersunk hole 121, and the insert nut 8 is threadedly connected to the countersunk hole 121, so that the first matching workpiece 7 can be easily disassembled and assembled. In other embodiments, the insert nut 8 can also be inserted into the countersunk hole 121 by interference fit. In this embodiment, the axes of the through hole 12, the insert nut 8 and the first matching workpiece 7 all extend in the vertical direction.

[0052] like Figure 2 As shown, the wear test fixture also includes a support component 4, which is connected to the substrate 1, and the support component 4 is against the valve needle 6, and the axis of the valve needle 6 forms an angle with the axis of the first matching workpiece 7. Therefore, the friction between the valve needle 6 and the first matching workpiece 7 during the test is slightly greater than the friction between the valve needle 6 and the first matching workpiece 7 during the actual working process. On the one hand, the test results are amplified, and the comparison between the tested first matching workpieces 7 can be more obvious, so that the appropriate first matching workpiece 7 can be selected more accurately. On the other hand, the first matching workpiece 7 is selected according to more stringent standards to ensure that the selected first matching workpiece 7 will not be damaged within the predetermined service life. Optionally, the angle can be 1°, 2° or 3°, etc., which is not specifically limited here.

[0053] Specifically, the support assembly 4 includes a longitudinal fixing plate 41, a transverse plate 42 and an adjusting member 5. The longitudinal fixing plate 41 extends in the vertical direction and one end is connected to the base plate 1; the transverse plate 42 extends approximately in the horizontal direction and is connected to the other end of the longitudinal fixing plate 41. The end face of the transverse plate 42 includes a butt surface 421, which abuts against the valve needle 6; the adjusting member 5 is used to adjust the angle of the transverse plate 42 relative to the longitudinal fixing plate 41, so as to adjust the inclination angle of the butt surface 421, and then adjust the angle of the valve needle 6 relative to the first mating workpiece 7. The structure is simple and it is easy to adjust the angle.

[0054] In this embodiment, the support assembly 4 further includes a first fastener 43, and the transverse plate 42 is connected to one end of the longitudinal fixing plate 41 through the first fastener 43. Optionally, the first fastener 43 may be a bolt, which passes through the longitudinal fixing plate 41 and is threadedly connected to the transverse plate 42.

[0055] In some embodiments, the first fastener 43 is arranged at the center of the connection between the transverse plate 42 and the longitudinal fixed plate 41. The adjusting member 5 includes at least one adjusting gasket, which is arranged between the longitudinal fixed plate 41 and the transverse plate 42 so that the axis of the valve needle 6 forms an angle with the axis of the first matching workpiece 7. Specifically, the adjusting gasket is clamped at the upper end or the lower end between the longitudinal fixed plate 41 and the transverse plate 42, so that the angle between the longitudinal fixed plate 41 and the transverse plate 42 can be changed, that is, the transverse plate 42 is inclined relative to the longitudinal fixed plate 41, and the abutting surface 421 on the transverse plate 42 is inclined correspondingly, and the abutting surface 421 causes the axis of the valve needle 6 to form an angle with the axis of the first matching workpiece 7, thereby increasing the matching friction between the valve needle 6 and the first matching workpiece 7. Optionally, the number of adjusting gaskets can be one, two, three or more, and the size of the angle between the longitudinal fixed plate 41 and the transverse plate 42 can be adjusted by changing the number of adjusting gaskets.

[0056] In some embodiments, the adjusting member 5 includes an adjusting screw, and the adjusting member 5 and the first fastener 43 are arranged along the axial direction of the valve needle 6. Specifically, an external thread is provided on the surface of the adjusting screw, a through hole is provided in the transverse direction on the longitudinal fixing plate 41 to match the adjusting screw, an internal thread matching the external thread of the adjusting screw is provided in the through hole, the adjusting screw is threadedly connected with the through hole and its end abuts the transverse plate 42, when the adjusting screw rotates, the adjusting screw is displaced relative to the longitudinal fixing plate 41, along the axial direction of the first matching workpiece 7, the position of one end of the transverse plate 42 connected with the first fastener 43 remains unchanged, while the other end is pressed away from the longitudinal fixing plate 41 by the adjusting screw, thereby changing the angle of the transverse plate 42 relative to the longitudinal fixing plate 41, and accordingly, the angle of the abutting surface 421 on the transverse plate 42 is tilted, and the abutting surface 421 abuts the valve needle 6 to generate an angle between the axis of the valve needle 6 and the axis of the first matching workpiece 7.

[0057] In this embodiment, the abutment surface 421 is constructed as a groove surface, and the circumferential surface of the valve needle 6 abuts against the groove surface and slides with the groove surface, that is, the groove surface guides the movement of the valve needle 6, preventing the valve needle 6 from deviating in directions other than the abutment angle, ensuring the movement accuracy of the valve needle 6, and improving the reliability of the wear test. In this embodiment, the valve needle 6 is a cylindrical needle, and the groove surface is a partial cylindrical surface. In some embodiments, the valve needle 6 can also be a prismatic needle, and correspondingly, the groove surface is a partial prismatic surface.

[0058] In order to facilitate the installation and removal of the first mating workpiece 7 from the substrate 1, the support assembly 4 is detachably connected to the substrate 1. When the first mating workpiece 7 needs to be installed, the support assembly 4 is removed from the substrate 1, and after the first mating workpiece 7 and the insert nut 8 are sleeved on the valve needle 6 and installed on the substrate 1, the support assembly 4 can be installed on the substrate 1. Thereby, the convenience of disassembly and assembly of the first mating workpiece 7 is improved. Optionally, the wear test fixture also includes a second fastener 44, and the end of the longitudinal fixing plate 41 away from the transverse plate 42 is connected to the substrate 1 through the second fastener 44. In other embodiments, the longitudinal fixing plate 41 can also be connected to the substrate 1 by plugging, which is not limited here.

[0059] Because the guide sleeve is in a high temperature environment when it is working normally, in order to more accurately simulate the working state of the guide sleeve, such as Figure 2 As shown, the wear test fixture also includes a heating component 3, which is laid on the substrate 1 and can heat the substrate 1, thereby simulating a real hot runner system environment, so that the environment of the first mating workpiece 7 during the test process is closer to the actual application situation.

[0060] like Figure 2 As shown, in this embodiment, the heating component 3 includes a heating pipe 32, and heating ports 31 are provided at both ends of the heating pipe 32. The heating port 31 can be connected to an external device that can provide a high-temperature medium, so that the heating pipe 32 heats the substrate 1. Optionally, the heating component 3 can heat the substrate 1 to 300°C. In some embodiments, the heating component 3 can also be an electric heating wire, which can be directly heated after being connected to an external power source. The specific heating method of the heating component 3 is not limited here.

[0061] In this embodiment, a mounting groove 11 is provided on the substrate 1 for placing the heating component 3, thereby preventing the heating component 3 from shaking and ensuring that the heating component 3 stably heats the substrate 1. In some embodiments, the heating component 3 can be directly mounted on the surface of the substrate 1; or a through hole is provided inside the substrate 1, and the heating component 3 is placed in the through hole. The specific mounting method of the heating component 3 on the substrate 1 is not limited here.

[0062] In this embodiment, the installation groove 11 opened on the substrate 1 is a curved groove. The curved groove is opened on the upper and lower surfaces of the substrate 1. The curved groove is opened evenly. The heating component 3 is laid in the curved groove so that the substrate 1 is heated evenly as a whole. The shape of the installation groove 11 is not specifically limited here.

[0063] In this embodiment, the wear test fixture further includes a temperature sensor, which is disposed on the substrate 1 and can detect the temperature of the substrate 1. The temperature of the substrate 1 can be better monitored and controlled, and when it is lower than or higher than a specified temperature, it is convenient for the operator to adjust the heating component 3 in time to ensure that the temperature of the substrate 1 during the test is adapted to the temperature of the first matching workpiece 7 when the hot runner system is working.

[0064] In order to select the first matching workpiece 7 of the appropriate material, multiple and multiple groups of comparative tests need to be performed. In order to improve the test efficiency, for example Figure 2 As shown, the wear test fixture includes at least two valve needles 6, at least two through holes 12 are provided on the substrate 1, a first matching workpiece 7 is installed at each through hole 12, and each valve needle 6 is correspondingly penetrated by a first matching workpiece 7, and the driving component 2 can drive at least two valve needles 6 to reciprocate. Thus, multiple groups of wear tests can be carried out at the same time, so as to more efficiently select the first matching workpiece 7 with wear resistance.

[0065] Specifically, the number of through holes 12 is consistent with the number of valve needles 6, and the number of driving members 21 for driving the valve needle 6 to move may be different from the number of valve needles 6. That is, it can be understood that one driving member 21 can drive multiple valve needles 6 to move at the same time, or one driving member 21 can drive one valve needle 6 to move.

[0066] In some embodiments, the number of through holes 12 and valve needles 6 can be two, four, six or more, and the number of comparative tests can be further increased by increasing the number of through holes 12 and valve needles 6. In this embodiment, eight through holes 12 are provided, and correspondingly, eight valve needles 6 are provided, and eight driving members 21 are provided.

[0067] In actual use, the valve needles 6 can be divided into multiple groups, wherein the same group includes two or more valve needles 6. The first matching workpieces 7 tested by the valve needles 6 in the same group are made of the same material, and the test results of the multiple first matching workpieces 7 in the group are averaged to ensure that the test results of the material are reliable. Different groups of valve needles 6 test first matching workpieces 7 of different materials, and finally the test results of different groups of valve needles 6 on first matching workpieces 7 of different materials are compared, so that the first matching workpiece 7 with suitable materials can be selected.

[0068] In the needle valve hot runner system, the valve needle 6 cooperates with the hot nozzle in addition to the first accessory 7. The cooperation between the hot nozzle and the valve needle 6 affects the discharge of the melt. If the hot nozzle is severely worn, leakage will occur, so it is also necessary to select a hot nozzle with better wear resistance.

[0069] In order to make the wear test fixture also applicable to the wear test of the hot nozzle (hereinafter referred to as the second matching component), the support component 4 also includes a mounting member (not shown in the figure), and either the transverse plate 42 or the mounting member can be installed on the end of the longitudinal fixed plate 41 away from the base plate 1. When the first matching workpiece 7 needs to be tested, the transverse plate 42 is installed on the longitudinal fixed plate 41, and the transverse plate 42 is used to abut the valve needle 6; when the second matching workpiece needs to be tested, the mounting member is installed on the longitudinal fixed plate 41, and the mounting member fixes the second matching workpiece, and one end of the valve needle 6 is passed through the second matching workpiece. That is, by providing the transverse plate 42 and the mounting member that can be installed on the longitudinal fixed plate 41, the wear test fixture can realize the wear test of the first matching workpiece 7 and the wear test of the second matching workpiece.

[0070] In some embodiments, the mounting member and the longitudinal fixing plate 41 may be connected by threads. Specifically, bolts pass through the longitudinal fixing plate 41 and are threadedly connected to the mounting member.

[0071] The hot nozzle is constructed as a cylindrical structure, and includes a head and a tail arranged along the axial direction, and the cross-sectional area of ​​the head is smaller than that of the tail. The mounting member includes a main body plate and a fastening nut. A connecting groove is arranged on the main body plate, and the connecting groove is arranged along the axial direction of the valve needle 6. A sink groove is arranged at one end of the connecting groove away from the base plate 1. The fastening nut is sleeved on the head of the second matching workpiece and connected to the inner wall of the sink groove of the mounting member to press the tail of the hot nozzle between the fastening nut and the bottom surface of the sink groove. In this way, the second matching workpiece is fixed on the main body plate to prevent the position of the second matching workpiece from being offset during the reciprocating motion of the valve needle 6 relative to the second matching workpiece.

[0072] Optionally, an outer thread is provided on the outer periphery of the fastening nut, an inner thread is provided on the inner wall of the sink groove, and the fastening nut is connected to the sink groove, so that the second matching workpiece can be easily assembled and disassembled. In other embodiments, the fastening nut can also be inserted into the sink groove by interference fit. In this embodiment, the axes of the connecting groove, the fastening nut and the second matching workpiece all extend in the vertical direction.

[0073] Optionally, the adjusting member 5 can also be used to adjust the angle of the mounting member relative to the longitudinal fixing plate 41. Thus, the axial direction of the second mating workpiece mounted on the mounting member forms a certain angle with the axial direction of the valve needle 6. Therefore, when the wear test is performed on the second mating workpiece, the friction degree between the valve needle 6 and the second mating workpiece is slightly greater than the friction degree between the valve needle 6 and the second mating workpiece during the actual working process. On the one hand, the test results are amplified, and the contrast between the tested second mating workpieces can be made more obvious, so that the appropriate second mating workpiece can be selected more accurately. On the other hand, the second mating workpiece is selected according to more stringent standards to ensure that the selected second mating workpiece will not be damaged within the predetermined service life. Specifically, the specific matching method of the adjusting member 5 and the mounting member is the same as the matching method of the adjusting member 5 and the transverse plate, and is not specifically limited here.

[0074] In this embodiment, the height of the longitudinal fixing plate 41 is adjustable, and when performing a wear test on the first mating workpiece 7 or the second mating workpiece, the height of the longitudinal fixing plate 41 can be adjusted accordingly according to the specific mating position of the valve needle 6 and the corresponding mating workpiece.

[0075] Specifically, the longitudinal fixing plate 41 includes a first longitudinal fixing plate 411, a second longitudinal fixing plate 412 and a locking piece. The first longitudinal fixing plate 411 is connected to the base plate 1, one end of the second longitudinal fixing plate 412 is connected to the first longitudinal fixing plate 411 and the two can slide relative to each other, and the transverse plate 42 is connected to the other end of the second longitudinal fixing plate 412. The locking piece can lock the first longitudinal fixing plate 411 and the second longitudinal fixing plate 412. When the height of the longitudinal fixing plate 41 needs to be adjusted, the locking piece is unlocked. When the longitudinal fixing plate 41 is adjusted to the specified height, the locking piece is locked.

[0076] The actual working process of the wear test fixture is roughly as follows:

[0077] (1) When the first mating workpiece 7 needs to be tested:

[0078] The support assembly 4 is removed from the base plate 1, the first matching workpiece 7 and the insert nut 8 are sleeved on the valve needle 6 and installed on the base plate 1, and then the support assembly 4 is installed on the base plate 1;

[0079] The adjusting member 5 is adjusted to generate a certain angle between the valve needle 6 and the first matching workpiece 7, thereby generating a greater friction effect, amplifying the test results, and making the comparison between the tested first matching workpieces 7 more obvious;

[0080] The drive assembly 2 is started to drive the valve needle 6 to reciprocate relative to the first mating workpiece 7 to simulate the number of frictions during the average service life of a hot runner system, for example, about 1.5 million times, so as to more accurately select the appropriate first mating workpiece 7.

[0081] (2) When the second mating workpiece needs to be tested:

[0082] Remove the transverse plate 42 from the longitudinal fixing plate 41, pass the valve needle 6 through the mounting piece, and install the mounting piece on the longitudinal fixing plate 41, and sequentially sleeve the second matching workpiece and the fastening nut on the valve needle 6 and install them on the mounting piece;

[0083] Adjust the adjusting member 5 to create a certain angle between the second matching workpiece and the valve needle 6, thereby creating a greater friction between the two, amplifying the test results and making the comparison between the tested second matching workpieces more obvious;

[0084] The drive assembly 2 is started to drive the valve needle 6 to reciprocate relative to the second mating workpiece, simulating the number of frictions during the average service life of a hot runner system, which is about 1.5 million times, so as to more accurately select the appropriate second mating workpiece.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A wear test fixture, characterized in that: include: A base plate (1), the base plate (1) being used for mounting a cylindrical first matching workpiece (7); A valve needle (6) and a drive assembly (2), wherein one end of the valve needle (6) is connected to the drive assembly (2), and the other end is capable of passing through the first matching workpiece (7), and the drive assembly (2) is capable of driving the valve needle (6) to reciprocate relative to the first matching workpiece (7); A support assembly (4) is connected to the base plate (1); the support assembly (4) abuts against the valve needle (6), and the axis of the valve needle (6) forms an angle with the axis of the first matching workpiece (7).

2. The wear test fixture according to claim 1, characterized in that: The support assembly (4) comprises: A longitudinal fixing plate (41), one end of the longitudinal fixing plate (41) being connected to the base plate (1); A transverse plate (42) connected to the other end of the longitudinal fixed plate (41), the transverse plate (42) comprising an abutting surface (421), the abutting surface (421) abutting against the valve needle (6); An adjusting member (5), wherein the adjusting member (5) is capable of adjusting the angle of the transverse plate (42) relative to the longitudinal fixing plate (41) so as to adjust the inclination angle of the abutting surface (421).

3. The wear test fixture according to claim 2, characterized in that: The longitudinal fixing plate (41) is height-adjustable.

4. The wear test fixture according to claim 2, characterized in that: The adjusting member (5) comprises at least one adjusting gasket, which is arranged between the longitudinal fixing plate (41) and the transverse plate (42) so that the axis of the valve needle (6) forms an angle with the axis of the first matching workpiece (7).

5. The wear test fixture according to claim 1, characterized in that: The support assembly (4) has an abutment surface (421), the abutment surface (421) being configured as a groove surface, and the peripheral surface of the valve needle (6) abuts against the groove surface and is in sliding engagement with the groove surface.

6. The wear test fixture according to claim 1, characterized in that: The substrate (1) is provided with a through hole (12), the valve needle (6) passes through the through hole (12), and a countersunk hole (121) is provided at one end of the through hole (12); The first matching workpiece (7) comprises a main body (71) and an end (72), and the cross-sectional area of ​​the end (72) is larger than the cross-sectional area of ​​the main body (71); The wear test fixture also includes an insert nut (8), which is sleeved on the main body (71) and connected to the inner wall of the countersunk hole (121) so as to press the end portion (72) between the insert nut (8) and the bottom surface of the countersunk hole (121).

7. The wear test fixture according to any one of claims 1 to 6, characterized in that: The wear test fixture further comprises a heating component (3), wherein the heating component (3) is laid on the substrate (1) and is capable of heating the substrate (1).

8. The wear test fixture according to claim 7, characterized in that: The wear test fixture further comprises a temperature sensor, which is arranged on the substrate (1) and is capable of detecting the temperature of the substrate (1).

9. The wear test fixture according to any one of claims 1 to 6, characterized in that: The support assembly (4) includes a longitudinal fixing plate (41), a transverse plate (42) and a mounting member. The longitudinal fixing plate (41) is connected to the base plate (1). The transverse plate (42) and the mounting member can be selectively mounted on an end of the longitudinal fixing plate (41) away from the base plate (1). The transverse plate (42) is used to abut the valve needle (6). The mounting member is used to fix a second mating workpiece. The valve needle (6) passes through the second mating workpiece.

10. The wear test fixture according to any one of claims 1 to 6, characterized in that: The wear test fixture comprises at least two valve needles (6), the base plate (1) is capable of mounting at least two of the first matching workpieces (7), each valve needle (6) is correspondingly penetrated by one of the first matching workpieces (7), and the drive assembly (2) is capable of driving at least two of the valve needles (6) to reciprocate.

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