Spring reaction force testing device with sensor embedded in injection mold

Abstract

The application discloses a spring reaction force testing device with a sensor embedded in an injection mold, relates to the technical field of injection mold spring reaction force testing, and discloses the spring reaction force testing device with the sensor embedded in the injection mold, which comprises a testing table for testing the load of an injection mold testing component, a mounting table is arranged above the testing table, a plurality of fixing frames are arranged at four corners between the mounting table and the testing table, and the injection mold testing component comprises a mold base, a thimble panel is arranged on the mold base, a plurality of guide columns are fixed to the thimble panel, and a testing spring is arranged outside the guide columns. Through the linkage matching testing assembly, the supporting assembly and the unlocking assembly, the segmented constraint and working condition restoration of the testing spring are realized, and the problems of initial deflection rotation of the testing spring, easy scratching of the sensor, non-uniform testing reference and working condition simulation distortion in the testing process of the existing half mold group rack are solved.

Description

Technical Field

[0001] This invention relates to the field of spring reaction force testing technology for injection molds, specifically to a spring reaction force testing device with a sensor embedded in the injection mold. Background Technology

[0002] The ejection return spring of an injection mold is a core elastic component of the mold opening and closing mechanism and the product ejection return mechanism. Its elasticity stability, structural rigidity, and fatigue resistance directly determine the ejection return accuracy of the mold and the molding quality of the injection molded product. If the return spring elasticity weakens, the force is uneven, the assembly is eccentric, or the extension and retraction are stuck, it is very easy to cause molding defects such as mold ejector pins not returning to the correct position, slide misalignment, product whitening, tearing, and crushing. In severe cases, it can cause mold collision and structural wear, significantly reducing the service life of the mold and the stability of mass production. Therefore, in the mold assembly, trial molding, and maintenance stages, accurate testing of the reaction force and compression stroke mechanical characteristics of the return spring is a key process to ensure the stable operation of the injection mold.

[0003] Currently, the testing methods for injection mold return springs in the industry are mainly divided into two categories. One is offline general-purpose spring testing, which involves disassembling the spring and conducting a spring force test separately. The other is simple bench pressing test, which uses a lifting structure to directly compress the semi-assembled mold spring assembly to complete the mechanical test. Among them, the general-purpose spring testing machine can only test the inherent mechanical parameters of the spring unit, which cannot be adapted to the actual assembly conditions of the mold, and cannot simulate the actual stress state after the spring is in contact with the guide post and ejector plate. The test data deviates significantly from the actual working conditions of the mold, and has low reference value. Existing semi-module bench testing devices are simple in structure and highly adaptable, making them the mainstream in-situ simulation testing equipment in mold factories. However, in actual testing, due to the weak constraint on the spring in the initial stage of testing and the lack of self-locking of the spring coil, the spring is prone to circumferential rotation and radial sway under the action of the helical angle component force. This causes the spring coil at the end of the spring to make eccentric contact and relative sliding friction with the annular pressure sensor, which will cause scratches and wear on the sensor sensing surface, leading to problems such as zero-point drift, signal distortion, and shortened service life of the sensor. To address this, we propose a spring reaction force testing device with the sensor embedded in the injection mold. Summary of the Invention

[0004] The purpose of this invention is to provide a spring reaction force testing device for embedding a sensor in an injection mold, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spring reaction force testing device for a sensor embedded in an injection mold, comprising a test platform for testing the load-bearing capacity of an injection mold test component, a mounting platform above the test platform, and multiple sets of fixing brackets connecting and fixing the mounting platform and the test platform at their four corners. The injection mold test component includes a mold base, an ejector plate on the mold base, multiple sets of guide posts fixed on the ejector plate, a test spring sleeved on the outer side of each guide post, and coils fixed at both ends of the test spring. The device also includes: The positioning and mounting component is set between the test bench and the injection mold test component for positioning and placing the injection mold test component during the test process; A test component is set between the test bench and the mounting platform for testing the reaction force of a test spring. The test spring includes a ring pressure sensor. Multiple test components are provided, and each set of test components corresponds to a specific set of test springs. The mounting platform is provided with a lifting component for assisting the test component in raising and lowering during the test. Additionally, a support component is provided on the test assembly for anti-sway support of the test spring before testing. The support component prevents relative sliding between the end coil of the test spring and the annular pressure sensor before testing, which could cause scratches on the annular pressure sensor. The test assembly is also provided with an unlocking component for unlocking the support component during the compression process of the test spring. Through the cooperation of the support component and the unlocking component, the centering and anti-sway support of the test spring is ensured in the early stage of testing. After the support is removed, the actual compression condition of the test spring is restored.

[0006] Preferably, the test assembly includes a mounting cylinder, an inner side of which is a test cylinder, and the annular pressure sensor is embedded inside the test cylinder. The upper end of the test cylinder is integrally formed with a through tube for the end of the guide column to pass through during the test.

[0007] Preferably, multiple sets of support components are arranged in a circular array below the test cylinder and unlocking components are arranged above the through tube. Each set of support components corresponds to each set of unlocking components, and the support components and unlocking components are connected and driven by connectors. The interior of the mounting cylinder is provided with an elastic component for connecting the connectors.

[0008] Preferably, the support assembly includes a sector plate disposed below the test cylinder. The upper end of the sector plate is fixed with a sector push plate for pressing against the outer side of the test spring. The junction of the inner side of the sector plate and the sector push plate is provided with a conical surface for abutting against the circumference of the end spring coil of the test spring. During the descent of the mounting cylinder and the test cylinder, the conical surface abuts against the circumference of the end spring coil of the test spring, pushing each group of sector plates and sector push plates to move radially away from each other. After the movement, the elastic force of the elastic component resets the inner side of the sector push plate against the outer side of the test spring, providing anti-sway support for the test spring.

[0009] Preferably, the unlocking component includes a fan-shaped transmission plate disposed above the through tube, and the bottom of the fan-shaped transmission plate has an inclined surface for abutting against the end of the guide post for transmission.

[0010] Preferably, the connecting member is a fixing plate fixed between the sector plate and the sector transmission plate.

[0011] Preferably, the elastic component includes multiple sets of mounting rods slidably connected to the fixed plate. The mounting rods are fixed between the mounting cylinder and the test cylinder, and the mounting rods connect the mounting cylinder and the test cylinder to make the mounting cylinder, the test cylinder and the annular pressure sensor embedded in the inner side of the test cylinder concentric. The outer side of the mounting rod is fitted with a mounting spring, and the two ends of the mounting spring are respectively abutted against the inner side of the mounting cylinder and the fixed plate.

[0012] Preferably, the lifting assembly includes a lifting plate disposed between the test platform and the mounting platform, the mounting cylinder is fixed to the lifting plate, a cylinder for driving the lifting plate to move up and down is mounted on the mounting platform, and a guide assembly for assisting the lifting is disposed between the mounting platform and the lifting plate.

[0013] Preferably, the guide assembly includes two sets of sliding holes symmetrically opened on the mounting platform, and a T-shaped guide rod is slidably connected to the sliding hole, with one end of the T-shaped guide rod fixed to the lifting plate.

[0014] Preferably, the positioning and installation assembly includes four sets of L-shaped positioning plates disposed on the test bench for positioning against the periphery of the mold base. The L-shaped positioning plates are provided with guide surfaces for guiding the mold base towards each set of L-shaped positioning plates during placement. Side plates are fixed on the L-shaped positioning plates and are detachably fixed to the test bench by bolts.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adds a ring array support component. During the initial downward test, the tapered surface abuts against the outer circumference of the spring coil at the end of the spring, and the elastic component automatically resets and surrounds it, forming a multi-point centered clamping support for the outer ring of the test spring. This ensures that the test spring always remains in a vertical state concentric with the guide column and the ring pressure sensor, effectively limiting the initial torsion and sway of the spring, and eliminating eccentric contact and relative sliding friction between the spring coil and the sensor. This fundamentally avoids problems such as wear of the sensor sensing surface, zero-point drift, and signal distortion, and greatly improves the service life of the sensor and the stability of the test data. 2. This invention features a linkage unlocking component. After the spring compresses downwards, the spring coil gradually engages and locks itself, and enters a stable pressurization stage, the guide column end pushes against the inclined surface of the fan-shaped transmission plate. The mechanical linkage drives the support component to automatically expand outwards and unlock, removing external radial constraints. This accurately simulates the actual force state of the spring during the later stage of compression in the injection mold process, where the spring coil relies on its own self-locking limit and there is no external mechanical clamping. This eliminates the additional frictional resistance caused by manual rigid support, avoids the problem of inflated force measurement data and deviations in stiffness parameters, and ensures that the test data closely matches the actual mass production conditions of the mold. 3. This invention is based on in-situ testing of the mold in a semi-assembled state, retaining the real assembly relationship of the spring, guide post, and ejector plate. Combined with a segmented support and unlocking structure, it truly replicates the spring compression deformation and force constraint characteristics under the mold assembly conditions, effectively making up for the shortcomings of traditional single-machine testing that is detached from actual working conditions, and greatly improving the engineering reference value of spring mechanical performance test data. 4. This invention sets up multiple test components that correspond one-to-one with the test springs, enabling simultaneous alignment and testing of multiple sets of mold reset springs. Compared with the traditional method of testing each set individually, this significantly improves the efficiency of batch testing of mold springs. It can simultaneously compare the elasticity consistency of multiple springs in the same mold, accurately locate defects such as elasticity decay, uneven force, and off-center load instability of a single spring, and provide accurate data for mold assembly debugging and subsequent maintenance and replacement. It effectively avoids problems such as mold ejection jamming and poor product molding caused by the failure of a single spring. 5. This invention features a detachable L-shaped positioning component with a guide surface on the test bench, which can surround and guide the mold base for positioning, ensuring accurate placement and secure fixing of the mold half-module. This effectively prevents slippage and torsional offset of the mold components during testing, ensuring consistent coaxiality of the spring, guide column, and sensor in each test. It also avoids test errors such as eccentric force and data fluctuation caused by assembly offset, further improving test repeatability and detection accuracy, and ensuring the stability and reliability of long-term batch testing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2This is a schematic diagram showing the state of the injection mold test component after positioning and installation according to the present invention; Figure 3 This is a schematic diagram of the positioning and mounting component structure of the present invention; Figure 4 This is a schematic diagram of the lifting assembly and guide assembly of the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the lifting plate, the injection mold testing component, and the lifting assembly of the present invention; Figure 6 This is a schematic diagram showing the positional relationship between the mounting cylinder and the lifting plate of the present invention; Figure 7 This is a schematic diagram of the test component structure of the present invention; Figure 8 This is a schematic diagram of the support component and unlocking component structure of the present invention; Figure 9 This is a schematic diagram showing the positional relationship between the support component, unlocking component, connector, and elastic component of the present invention; Figure 10 This is a schematic diagram of the support assembly of the present invention before it supports the test spring; Figure 11 This is a schematic diagram of the support component of the present invention supporting the test spring. Figure 12 This is a schematic diagram of the state of the support component of the present invention when the test spring is unlocked.

[0017] In the diagram: 101-Test stand; 102-Mounting stand; 103-Fixing frame; 201-Mold base; 202-Ejector pin panel; 203-Guide column; 204-Test spring; 301-L-shaped positioning plate; 302-Guide surface; 303-Side plate; 401-Mounting cylinder; 402-Test cylinder; 403-Annular pressure sensor; 404-Through tube; 501-Sector plate; 502-Sector push plate; 503-Conical surface; 601-Sector transmission plate; 602-Sloping surface; 7-Fixing plate; 801-Mounting rod; 802-Mounting spring; 901-Lifting plate; 902-Cylinder; 1001-Sliding hole; 1002-T-shaped guide rod. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figures 1-12The sensor embedded in the injection mold spring reaction force testing device shown in the figure includes a test platform 101 for testing the load-bearing capacity of the injection mold test component. A mounting platform 102 is provided above the test platform 101. The four corners between the mounting platform 102 and the test platform 101 are connected and fixed by multiple sets of fixing brackets 103. The injection mold test component includes a mold base 201. An ejector plate 202 is provided on the mold base 201. Multiple sets of guide posts 203 are fixed on the ejector plate 202. A test spring 204 is sleeved on the outside of the guide post 203. Spring coils are fixed at both ends of the test spring 204. It should be noted here that the installation, connection relationship and specific structure of the various components on the injection mold testing component are known technologies in this application and will not be described in detail here. Also includes: The positioning and mounting component is set between the test bench 101 and the injection mold test component for positioning and placing the injection mold test component during the test process; The test assembly is set between the test bench 101 and the mounting platform 102 for testing the reaction force of the test spring 204. The test spring 204 includes an annular pressure sensor 403. Multiple test assemblies are set, and each set of test assemblies corresponds to each set of test springs 204. The mounting platform 102 is equipped with a lifting assembly for assisting the lifting of the test assembly during the test. Additionally, a support component is provided on the test assembly to prevent the test spring 204 from swaying before testing. The support component prevents relative sliding between the end coil of the test spring 204 and the annular pressure sensor 403 before testing, which could cause scratches on the annular pressure sensor 403. The test assembly is also equipped with an unlocking component to unlock the support component during the pressing process of the test spring 204. Through the cooperation of the support component and the unlocking component, the test spring 204 is ensured to be centered and anti-sway supported in the early stage of testing. After the support is removed, the actual pressure condition of the test spring 204 is restored. It should be noted here that: by using interconnected test components, support components and unlocking components, the segmented constraint and working condition restoration of the test spring 204 can be achieved, which solves the problems of initial yaw rotation of the test spring 204, easy scratching of the sensor, inconsistent test benchmarks and distortion of working condition simulation in the existing semi-module bench test process.

[0020] Preferably, the test assembly includes a mounting cylinder 401, a test cylinder 402 is disposed inside the mounting cylinder 401, and an annular pressure sensor 403 is embedded inside the test cylinder 402. It should be noted here that the embedded installation of the annular pressure sensor 403 facilitates the protection of the annular pressure sensor 403. The upper end of the test cylinder 402 is integrally formed with a through tube 404 for the end of the guide post 203 to pass through during the test; It should be noted here that as the lifting plate 901 drives the test component to continue to move downward at a constant speed, the upper end of the test spring 204 smoothly abuts against the sensing surface of the annular pressure sensor 403 embedded inside the test cylinder 402. As the lifting plate 901 continues to press down, the test spring 204 is gradually compressed until it reaches the specified compression length. During this process, the axial reaction force generated by the test spring 204 continues to increase and acts on the annular pressure sensor 403 in real time. The annular pressure sensor 403 continuously collects the spring compression mechanical data to complete the spring reaction force test. Furthermore, the structure and principle of the annular pressure sensor 403, as well as the composition and testing principle of the entire data testing component, are conventional technical means in this application and will not be elaborated upon further.

[0021] Preferably, multiple sets of support components are arranged in a circular array below the test cylinder 402 and unlocking components are arranged above the through tube 404. Each set of support components corresponds one-to-one with each set of unlocking components, and the support components and unlocking components are connected and driven by connectors. The mounting cylinder 401 is provided with an elastic component for connecting the connectors. The support component includes a fan-shaped plate 501 disposed below the test cylinder 402. The upper end of the fan-shaped plate 501 is fixed with a fan-shaped push plate 502 for pressing against the outside of the test spring 204. A tapered surface 503 is provided at the inner junction of plate 501 and fan-shaped push plate 502 for abutting against the circumference of the end spring coil of test spring 204. During the descent of mounting cylinder 401 and test cylinder 402, the tapered surface 503 abuts against the circumference of the end spring coil of test spring 204, pushing each set of fan-shaped plates 501 and fan-shaped push plate 502 to move radially away from each other. After the movement, through the elastic reset action of the elastic component, the inner side of the fan-shaped push plate 502 abuts against the outer side of test spring 204, providing anti-sway support for test spring 204. It should be noted here that: through the supporting action, the inner walls of multiple sets of fan-shaped push plates 502 are evenly attached and clamped around the outer ring of the test spring 204, supporting the outer side of the test spring 204. Through the multi-point encirclement and clamping of the ring array, the test spring 204 is kept in a vertical state concentric with the guide post 203 and the ring pressure sensor 403 before the test contact. Moreover, through the support, the initial stage is limited because the constraint on the test spring 204 is weak, the spring ring is not attached and self-locking, and the tangential component force is not restricted. The test spring 204 as a whole will not undergo circumferential torsion, rotation and radial yaw around its own axis. This prevents the end spring ring of the test spring 204 from eccentric contact and relative sliding friction with the ring pressure sensor 403, and avoids the problems of scratches, wear and zero-point drift of the ring pressure sensor 403 from the root.

[0022] Preferably, the unlocking component includes a fan-shaped transmission plate 601 disposed above the through tube 404, and the bottom of the fan-shaped transmission plate 601 is provided with an inclined surface 602 for abutting against the end of the guide post 203 for transmission. It should be noted here that: during the process of the lifting plate 901 continuing to descend and compressing the test spring 204, the guide column 203 remains vertically fixed. As the test assembly continues to descend, the end of the guide column 203 passes through the through tube 404 of the test cylinder 402 and forms a pushing force on the inclined surface 602 of the fan-shaped transmission plate 601. After being subjected to force, the inclined surface 602 generates a horizontal radial component force, which drives the multiple sets of fan-shaped transmission plates 601 in the ring array to slide outward radially. Since the fan-shaped transmission plate 601 is rigidly connected to the lower fan-shaped plate 501 through the fixing plate 7, the fan-shaped plate 501 and the fan-shaped push plate 502 expand outward synchronously with the fan-shaped transmission plate 601. The inner wall of the fan-shaped push plate 502 completely detaches from the outer ring of the test spring 204, and the radial support unlocking and removal action is completed during the spring compression and force measurement pressurization process. Additionally, it is important to note that after the coil of the test spring 204 comes into contact with the annular pressure sensor 403, the spring continues to descend, causing the coil of the test spring 204 and the annular pressure sensor 403 to lock together. After locking, the support is unlocked through transmission. Furthermore, the reaction force detection via the annular pressure sensor 403 is performed after unlocking to avoid affecting the test.

[0023] Preferably, the connecting component is a fixing plate 7 fixed between the sector plate 501 and the sector transmission plate 601; It should be noted here that the rigid connection between the auxiliary sector plate 501 and the sector transmission plate 601 is achieved through the fixing plate 7.

[0024] Preferably, the elastic component includes multiple sets of mounting rods 801 slidably connected to the fixed plate 7. The mounting rods 801 are fixed between the mounting cylinder 401 and the test cylinder 402. Through the mounting rods 801, the mounting cylinder 401, the test cylinder 402 and the annular pressure sensor 403 embedded in the inner side of the test cylinder 402 are in a concentric state. The outer side of the mounting rods 801 is fitted with a mounting spring 802. The two ends of the mounting spring 802 are respectively abutted against the inner side of the mounting cylinder 401 and the fixed plate 7. It should be noted that: the mounting rod 801 assists in the connection and fixation between the mounting cylinder 401 and the test cylinder 402, the mounting rod 801 assists in the sliding of the fixed plate 7 after being subjected to force, and the mounting spring 802 facilitates the elastic reset of the fixed plate 7 after movement.

[0025] Preferably, the lifting assembly includes a lifting plate 901 disposed between the test platform 101 and the mounting platform 102, a mounting cylinder 401 fixed on the lifting plate 901, a cylinder 902 for driving the lifting plate 901 to be lifted and lowered on the mounting platform 102, and a guide assembly for assisting the lifting and lowering is disposed between the mounting platform 102 and the lifting plate 901. It should be noted here that: the cylinder 902 above the mounting platform 102 drives the lifting plate 901 to move vertically downward along the T-shaped guide rod 1002 at a uniform and stable speed, and the lifting plate 901 drives multiple sets of test components fixed on it to move downward synchronously. In addition, the working principle and control method of cylinder 902 are common technologies in this application and will not be described in detail here.

[0026] Preferably, the guide assembly includes two sets of sliding holes 1001 symmetrically opened on the mounting platform 102, and a T-shaped guide rod 1002 is slidably connected to the sliding hole 1001, with one end of the T-shaped guide rod 1002 fixed to the lifting plate 901; It should be noted here that the lifting plate 901 is guided to rise and fall during the lifting process by two sets of sliding holes 1001 and T-shaped guide rods 1002.

[0027] Preferably, the positioning and installation assembly includes four sets of L-shaped positioning plates 301 disposed on the test bench 101 for positioning against the periphery of the mold base 201. The L-shaped positioning plates 301 are provided with guide surfaces 302 for guiding the mold base 201 towards each set of L-shaped positioning plates 301 during placement. Side plates 303 are fixed on the L-shaped positioning plates 301 and are detachably fixed to the test bench 101 by bolts. It should be noted here that: the assembled injection mold test component is placed on the test table 101. During the placement process, the mold base 201 on the injection mold test component slides along the guide surface 302 of the L-shaped positioning plate 301 into the positioning area between the four sets of L-shaped positioning plates 301 and abuts against each other. The four L-shaped positioning plates 301 abut against the periphery of the mold base 201 from all sides, thereby achieving the positioning of the mold base 201 and the entire injection mold test component.

[0028] In this solution, the sensor is embedded in the spring reaction force testing device of the injection mold, including the following steps: Before the test begins, the assembled injection mold test component is placed on the test bench 101. During placement, the mold base 201 on the injection mold test component slides along the guide surface 302 of the L-shaped positioning plate 301 into the positioning area between the four sets of L-shaped positioning plates 301 and abuts against each other. The four L-shaped positioning plates 301 abut against the periphery of the mold base 201 from all sides, thereby achieving the positioning of the mold base 201 and the entire injection mold test component (see...). Figure 2 (state) After positioning and placement, the cylinder 902 above the mounting platform 102 drives the lifting plate 901 to move vertically downwards at a uniform speed along the T-shaped guide rod 1002. The lifting plate 901 drives multiple sets of test components fixed on it to move downwards synchronously. Each set of test components is aligned with each set of test springs 204 below. In the initial stage of downward testing, the fan-shaped plates 501 and fan-shaped push plates 502 arranged in a ring below the test cylinder 402 move downwards synchronously with the test components. During the downward movement, the conical surface 503 first contacts the upper coil of the test spring 204, and the coil at the end of the test spring 204 exerts a radial force on the conical surface 503. The pushing force drives the multiple sets of sector plates 501 and the fixing plate 7 to slide radially outward along the mounting rod 801, overcoming the preload of the elastic component. When the upper coil of the test spring 204 is fully enclosed by the multiple sets of sector push plates 502, the conical surface 503 disengages from the pushing constraint of the test spring 204 coil. The mounting spring 802, sleeved on the outside of the mounting rod 801, elastically resets, pushing the fixing plate 7, sector plates 501, and sector push plates 502 to retract inward simultaneously. This causes the inner walls of the multiple sets of sector push plates 502 to evenly adhere and clamp around the outer ring of the test spring 204, providing support for the outer side of the test spring 204 (see...). Figure 11 The test spring 204 is held vertically concentric with the guide post 203 and the annular pressure sensor 403 before the test is initiated by multi-point encirclement and clamping of the test spring 204 through a ring array. The support also restricts the initial stage where the test spring 204 is weakly constrained, the spring coil has no self-locking, and the tangential force is unrestricted. This prevents the test spring 204 from circumferentially twisting, rotating, and radially swaying around its own axis. This eliminates the eccentric contact and relative sliding friction between the end spring coil of the test spring 204 and the annular pressure sensor 403, thus avoiding scratches, wear, and zero-point drift of the annular pressure sensor 403 from the root cause. As the lifting plate 901 drives the test assembly to continue its downward, uniform feeding, the upper coil of the test spring 204 smoothly abuts against the sensing surface of the annular pressure sensor 403 embedded inside the test cylinder 402 (see...). Figure 11 As the lifting plate 901 continues to press down, the test spring 204 is gradually compressed until it reaches the specified compression length. During this process, the axial reaction force generated by the test spring 204 continues to increase and acts on the annular pressure sensor 403 in real time. The annular pressure sensor 403 continuously collects the spring compression mechanical data to complete the spring reaction force test. As the lifting plate 901 continues to descend, compressing and measuring the force on the test spring 204, the guide column 203 remains vertically fixed. The test assembly continues to descend, causing the end of the guide column 203 to pass through the through-tube 404 of the test cylinder 402 and exert a pushing force on the inclined surface 602 of the fan-shaped transmission plate 601. The inclined surface 602, under this force, generates a horizontal radial component, driving the multiple sets of fan-shaped transmission plates 601 in the annular array to slide outward radially. Since the fan-shaped transmission plate 601 is rigidly connected to the lower fan-shaped plate 501 via the fixing plate 7, the fan-shaped plate 501 and the fan-shaped push plate 502 expand outward synchronously with the fan-shaped transmission plate 601. The inner wall of the fan-shaped push plate 502 completely detaches from the outer ring of the test spring 204, completing the radial support unlocking and removal action during the spring compression and force measurement process (see [reference]). Figure 12 In the actual working condition of the injection mold, after the test spring 204 is compressed and continuously pressurized, the coils at both ends of the test spring 204 gradually close and lock, possessing stable radial limiting capability. By unlocking the support, there is no external mechanical clamping support inside the mold. If rigid support is maintained throughout the test, it will increase the sliding friction resistance of the outer ring of the test spring 204, causing abnormal force measurement data and distortion of the working condition simulation (the entire test process is carried out after unlocking). This device automatically unlocks mechanically during the downward stroke, actively removing the external support constraint when the test spring 204 enters the compression working condition, allowing the test spring 204 to return to a free compressed state, restoring the force, deformation, and friction state under the real assembly environment of the mold, ensuring that the measured spring stiffness, ultimate reaction force, and deformation characteristics are highly consistent with the actual mass production working conditions, and improving the authenticity and accuracy of the test.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spring reaction force testing device for sensor embedded in injection mold, comprising: A test bench (101) for bearing load testing of injection mold test components is provided. A mounting platform (102) is provided above the test bench (101). The four corners between the mounting platform (102) and the test bench (101) are connected and fixed by multiple sets of fixing brackets (103). The injection mold test component includes a mold base (201). An ejector plate (202) is provided on the mold base (201). Multiple sets of guide posts (203) are fixed on the ejector plate (202). A test spring (204) is sleeved on the outside of the guide post (203). The two ends of the test spring (204) are fixed with spring coils. Its characteristic is that it further includes: The positioning and mounting component is set between the test bench (101) and the injection mold test component for positioning and placing the injection mold test component during the test process; The test component is set between the test platform (101) and the mounting platform (102) for testing the reaction force of the test spring (204). The test spring (204) includes an annular pressure sensor (403). The test component is set in multiple sets, and each set of test components is set in correspondence with each set of test springs (204). The mounting platform (102) is provided with a lifting component for assisting the test component to rise and fall during the test. In addition, a support component is provided on the test assembly for anti-sway support of the test spring (204) before the test. The support component prevents relative sliding when the end spring of the test spring (204) comes into contact with the annular pressure sensor (403) before the test, which would cause scratches on the annular pressure sensor (403). The test assembly is provided with an unlocking component for unlocking the support component during the pressing process of the test spring (204). Through the cooperation of the support component and the unlocking component, the test spring (204) is centered and anti-sway supported in the early stage of the test. After the support is removed, the actual pressure condition of the test spring (204) is restored.

2. The spring reaction force testing device for sensor embedded in injection mold according to claim 1, characterized in that: The test assembly includes a mounting cylinder (401), and a test cylinder (402) is provided inside the mounting cylinder (401). The annular pressure sensor (403) is embedded inside the test cylinder (402). The upper end of the test cylinder (402) is integrally formed with a through tube (404) for the end of the guide post (203) to pass through during the test.

3. The spring reaction force testing device for sensor embedded in injection mold according to claim 2, characterized in that: The support components are arranged in a circular array below the test cylinder (402) and the unlocking components are arranged above the through tube (404). Each set of support components is arranged in a one-to-one correspondence with each set of unlocking components. The support components and unlocking components are connected and driven by connectors. The installation cylinder (401) is provided with an elastic component for connecting the connectors.

4. The spring reaction force testing device for sensor embedded in injection mold according to claim 3, characterized in that: The support assembly includes a sector plate (501) disposed below the test cylinder (402). The upper end of the sector plate (501) is fixed with a sector push plate (502) for pressing against the outer side of the test spring (204). A conical surface (503) is provided at the junction of the inner side of the sector plate (501) and the sector push plate (502) for abutting against the circumference of the end spring coil of the test spring (204). During the descent of the mounting cylinder (401) and the test cylinder (402), the conical surface (503) abuts against the circumference of the end spring coil of the test spring (204), pushing each group of sector plates (501) and sector push plates (502) to move radially away from each other. After the movement, through the elastic reset action of the elastic component, the inner side of the sector push plate (502) abuts against the outer side of the test spring (204), providing anti-sway support for the test spring (204).

5. The spring reaction force testing device for sensor embedded in injection mold according to claim 4, characterized in that: The unlocking component includes a fan-shaped transmission plate (601) disposed above the through tube (404), and the bottom of the fan-shaped transmission plate (601) is provided with an inclined surface (602) for abutting against the end of the guide post (203) for transmission.

6. The spring reaction force testing device for sensor embedded in injection mold according to claim 5, characterized in that: The connecting component is a fixing plate (7) fixed between the sector plate (501) and the sector transmission plate (601).

7. The spring reaction force testing device for sensor embedded in injection mold according to claim 6, characterized in that: The elastic component includes multiple sets of mounting rods (801) slidably connected to the fixed plate (7). The mounting rods (801) are fixed between the mounting cylinder (401) and the test cylinder (402). Through the mounting rods (801) connecting the mounting cylinder (401) and the test cylinder (402), the annular pressure sensor (403) embedded in the inner side of the mounting cylinder (402) is concentric. The outer side of the mounting rods (801) is fitted with a mounting spring (802). The two ends of the mounting spring (802) are respectively abutted against the inner side of the mounting cylinder (401) and the fixed plate (7).

8. The spring reaction force testing device for sensor embedded in injection mold according to claim 2, characterized in that: The lifting assembly includes a lifting plate (901) disposed between the test platform (101) and the mounting platform (102), the mounting cylinder (401) is fixed on the lifting plate (901), the mounting platform (102) is equipped with a cylinder (902) for lifting and driving the lifting plate (901), and a guide assembly for assisting the lifting and guiding is disposed between the mounting platform (102) and the lifting plate (901).

9. The spring reaction force testing device for sensor embedded in injection mold according to claim 8, characterized in that: The guide assembly includes two sets of sliding holes (1001) symmetrically opened on the mounting platform (102). A T-shaped guide rod (1002) is slidably connected to the sliding hole (1001), and one end of the T-shaped guide rod (1002) is fixed to the lifting plate (901).

10. The spring reaction force testing device for sensor embedded in injection mold according to claim 1, characterized in that: The positioning and installation assembly includes four sets of L-shaped positioning plates (301) disposed on the test bench (101) for positioning against the periphery of the mold base (201). The L-shaped positioning plates (301) are provided with guide surfaces (302) for guiding the mold base (201) towards each set of L-shaped positioning plates (301) during placement. Side plates (303) are fixed on the L-shaped positioning plates (301) and are detachably fixed to the test bench (101) by bolts.

Images