A bending strength detection device for a plastic housing of a household appliance

Abstract

The utility model relates to a kind of bending strength detection device of household appliance plastic shell, including operation frame, push plate, extrusion seat, cylinder, protective door and transmission mechanism, the household appliance plastic shell needing to be tested is placed on two placement tables, and located at the bottom of pressing plate, by rotating limit bolt and driving pressing plate to move down, household appliance plastic shell is pressed and holds fixed, cylinder is started and drives push plate to move down, and extrusion seat moves down, when push plate moves down, two vertical tooth rods move down, drive gear rotation, to control lever body rotation, make the gear of the both ends of lever body synchronous together rotation, two horizontal tooth rods can be realized to be close to each other, to make two protective doors close to each other and shield operation frame opening, and two protective doors are distributed in staggered position, when close to each other, cannot collide, when extrusion seat extrudes plastic shell, two protective doors can shield operation frame, after testing is completed, cylinder drives push plate to move up, and two protective doors are far away from each other and separate.

Description

Technical Field

[0001] This utility model relates to the field of strength testing equipment technology, specifically a device for testing the bending strength of plastic shells for household appliances. Background Technology

[0002] Bending strength refers to a material's ability to resist bending without breaking. As an important component of home appliance products, the bending strength of plastic casings directly affects the product's durability and safety. Therefore, testing the bending strength of plastic casings is a crucial step in ensuring product quality. However, existing plastic casing bending strength testing technologies may suffer from insufficient automation and safety. Traditional testing devices may lack protective equipment, and during bending strength testing, the casing may shatter, posing a danger.

[0003] For example, the authorized patent document with application number CN202122885887.5 discloses a bending strength testing device, which includes a base. A support spring is fixedly connected to the bottom wall inside the base. A movable top plate is fixedly connected to the top of the support spring. The base has two movable cavities and two hollow cavities opened sequentially from top to bottom. A transmission mechanism extending into and through the hollow cavity is movably connected inside the movable cavity. A worm gear located inside the hollow cavity is sleeved on the outside of the transmission mechanism. A worm gear matching the worm gear and extending to the outside of the base is movably connected between the left and right hollow cavities.

[0004] The aforementioned patent addresses the issue that during the testing process, the plastic casing may break or shatter due to insufficient pressure, posing a safety hazard to operators and equipment. Furthermore, the lack of automated protection means that we need to provide a device for testing the bending strength of plastic casings for household appliances. Utility Model Content

[0005] The purpose of this invention is to provide a device for testing the bending strength of plastic casings for household appliances. A transmission mechanism is provided in the operating frame to link the protective door and the push plate. When the cylinder drives the push plate to press down for testing, the protective door automatically closes. When the push plate moves up and is not being tested, the protective door automatically opens. This can effectively intercept fragments generated by the breakage of the plastic casing, preventing operators from being scratched or equipment from being damaged, and solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for testing the bending strength of plastic casings for household appliances, comprising:

[0007] The system comprises an operating frame, a push plate, an extrusion seat, a cylinder, a protective door, and a transmission mechanism. The bottom of the push plate is equipped with an extrusion seat for extruding the plastic shell of the appliance. The push plate is slidably installed inside the operating frame and works in conjunction with the transmission mechanism. The transmission mechanism is used to adjust the synchronous movement of the push plate and the protective door to achieve the downward movement of the push plate. The two protective doors move closer to each other to seal the operating frame. The protective doors are slidably installed inside the operating frame. A cylinder is fixedly installed inside the operating frame, and the bottom extension end of the cylinder is fixed to the surface of the push plate.

[0008] Preferably, the transmission mechanism includes a vertical rack, a horizontal rack, gears, and a rod body. The rod body is rotatably mounted inside the operating frame via a fixed seat. Two gears are respectively fixed at both ends of the rod body. The horizontal rack meshes with the gear near the protective door and its surface is fixed to the surface of the protective door. The vertical rack meshes with the gear away from the protective door and its upper end is fixed to the bottom of the push plate.

[0009] Preferably, the operating frame is provided with a protective box for protecting the gears. The protective box is slidably installed with the vertical and horizontal gears, and the surface of the operating frame is provided with a reserved groove for the vertical and horizontal gears to slide.

[0010] Preferably, the teeth on the surface of the horizontal toothed bar face downwards, and the surface is provided with a protective plate for protecting the teeth, while the teeth on the surface of the vertical toothed bar are disposed away from the extrusion seat.

[0011] Preferably, it also includes a placement component for fixing the plastic casing of the home appliance. The placement component includes a base, a placement platform, and a limiting component. The operating frame is provided with two bases. A placement platform is fixedly installed on the top of the base. A limiting component is provided on the top of the placement platform to fix the plastic casing of the home appliance.

[0012] Preferably, the limiting component includes a pressure plate, a limiting bolt, and a guide groove. A guide groove for sliding of the pressure plate is provided on one side of the placement platform. The limiting bolt is threadedly installed in the placement platform and is rotatably installed with the pressure plate.

[0013] Preferably, the bottom of the operating frame is provided with an adjustment part, which is used to adjust the two bases to move closer or further apart, so as to realize the placement of plastic shells of different types of home appliances.

[0014] Preferably, a pressure sensor is provided between the extrusion seat and the push plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model has a transmission mechanism in the operating frame, which links the protective door and the push plate. When the cylinder drives the push plate to press down for testing, the protective door automatically closes. When the push plate moves up to stop testing, the protective door automatically opens. This can effectively intercept the fragments generated by the cracking of the plastic shell and prevent the operator from being scratched or the equipment from being damaged. Attached Figure Description

[0017] Figure 1 This is a perspective view of the protective door of this utility model when closed;

[0018] Figure 2 A perspective view of the protective door of this utility model when opened;

[0019] Figure 3 This is a perspective view of the transmission mechanism of this utility model;

[0020] Figure 4 This is a three-dimensional view of the placement component of this utility model;

[0021] Figure 5 This is an exploded perspective view of the limiting component of this utility model;

[0022] Figure 6 This is a perspective view of the protective door of this utility model.

[0023] In the diagram: 1. Operating frame; 2. Push plate; 3. Extrusion seat; 4. Cylinder; 5. Protective door; 6. Transmission mechanism; 61. Vertical rack; 62. Horizontal rack; 63. Gear; 64. Rod body; 7. Protective box; 8. Reserved slot; 9. Placement component; 91. Base; 92. Placement platform; 93. Limiting component; 931. Pressure plate; 932. Limiting bolt; 933. Guide groove; 10. Protective plate; 11. Pressure sensor. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6 This utility model provides a technical solution: a device for testing the bending strength of plastic casings for household appliances, comprising:

[0026] The operating frame 1, push plate 2, extrusion seat 3, cylinder 4, protective door 5 and transmission mechanism 6 are provided. The bottom of the push plate 2 is provided with extrusion seat 3 for extruding the plastic shell of the household appliance. The push plate 2 is slidably installed in the operating frame 1 and is used in conjunction with the transmission mechanism 6. The transmission mechanism 6 is used to adjust the push plate 2 and the protective door 5 to move synchronously so that the push plate 2 moves down. The two protective doors 5 move close to each other to seal the operating frame 1. The protective door 5 is slidably installed in the operating frame 1. The cylinder 4 is fixedly installed in the operating frame 1. The bottom extension end of the cylinder 4 is fixed to the surface of the push plate 2.

[0027] Specifically, a transmission mechanism 6 is provided in the operating frame 1 to link the protective door 5 with the push plate 2. When the cylinder 4 drives the push plate 2 to press down for testing, the protective door 5 automatically closes. When the push plate 2 moves up to stop testing, the protective door 5 automatically opens. This can effectively intercept the fragments generated by the cracking of the plastic shell and prevent the operator from being scratched or the equipment from being damaged.

[0028] The cylinder 4 is fixed inside the operating frame 1, and the extension end is fixed to the top of the push plate 2. The two sides of the push plate 2 slide against the two sides of the inner wall of the operating frame 1, making the movement of the push plate 2 more stable. The extrusion seat 3 is located at the bottom of the push plate 2. Its bottom is arc-shaped, which extrudes the plastic shell of the household appliance to achieve the bending strength test. The transmission mechanism 6 is used to connect the push plate 2 with the two protective doors 5. When the push plate 2 moves up, the two protective doors 5 move away from each other. When the push plate 2 moves down, the two protective doors 5 move closer to each other. It should be noted that the two protective doors 5 are staggered and will not touch each other when they move close to each other. The protective doors 5 are made of high-strength transparent material.

[0029] The transmission mechanism 6 includes a vertical rack 61, a horizontal rack 62, a gear 63, and a rod 64. The rod 64 is rotatably mounted inside the operating frame 1 via a fixed seat. Two gears 63 are respectively fixed at both ends of the rod 64. The horizontal rack 62 meshes with the gear 63 near the protective door 5 and its surface is fixed to the surface of the protective door 5. The vertical rack 61 meshes with the gear 63 away from the protective door 5 and its upper end is fixed to the bottom of the push plate 2.

[0030] Furthermore, the rod 64 is rotatably mounted in the fixed seat inside the operating frame 1, and two gears 63 are respectively fixed at both ends of the rod 64, one meshing with the vertical gear 61 and the other meshing with the horizontal gear 62. When the push plate 2 moves down, the two vertical gears 61 move down, driving the gears 63 to rotate, thereby controlling the rotation of the rod 64, so that the gears 63 at both ends of the rod 64 rotate synchronously together, enabling the two horizontal gears 62 to move closer to each other, thereby allowing the two protective doors 5 to move closer to each other to block the opening of the operating frame 1. The two protective doors 5 are staggered and will not collide when they move closer to each other. When the squeezing seat 3 squeezes the plastic shell, the two protective doors 5 can block the operating frame 1.

[0031] The operating frame 1 is equipped with a protective box 7 for protecting the gear 63. The protective box 7 is slidably installed with the vertical gear 61 and the horizontal gear 62, and the surface of the operating frame 1 is provided with a reserved groove 8 for sliding of the vertical gear 61 and the horizontal gear 62.

[0032] It is worth noting that the operating frame 1 and the protective box 7 are slidably installed with the vertical toothed rod 61 and the horizontal toothed rod 62, and the protective box 7 is set to shield the two gears 63 to prevent splashed debris from adhering to the gears 63.

[0033] The teeth on the surface of the horizontal toothed bar 62 face downwards, and a protective plate 10 is provided on the surface to protect the teeth. The teeth on the surface of the vertical toothed bar 61 are located away from the extrusion seat 3.

[0034] The teeth on the surface of the horizontal toothed rod 62 are set downwards to avoid the adhesion of debris, and the guard plate 10 is set on one side. The teeth on the surface of the vertical toothed rod 61 are set away from the extrusion seat 3, all to protect the teeth on the surface of the horizontal toothed rod 62 as much as possible.

[0035] It also includes a placement component 9 for fixing the plastic shell of home appliances. The placement component 9 includes a base 91, a placement platform 92 and a limiting component 93. The operating frame 1 is provided with two bases 91. The placement platform 92 is fixedly installed on the top of the base 91. The limiting component 93 is provided on the top of the placement platform 92 to fix the plastic shell of home appliances.

[0036] Furthermore, the plastic casing of the appliance to be tested is placed on two placement platforms 92. The limiting member 93 can press and fix the plastic casing of the appliance, and the compression seat 3 is located above the two bases 91.

[0037] The limiting component 93 includes a pressure plate 931, a limiting bolt 932, and a guide groove 933. A guide groove 933 for sliding of the pressure plate 931 is provided on one side of the placement platform 92. The limiting bolt 932 is threadedly installed in the placement platform 92 and is rotatably installed with the pressure plate 931.

[0038] The plastic casing of the appliance is located at the bottom of the pressure plate 931 and the top of the placement platform 92. By rotating the limiting bolt 932, the pressure plate 931 is moved down, and the pressure plate 931 will squeeze and fix the plastic casing of the appliance. A guide groove 933 is provided on one side of the placement platform 92 to guide the movement of the pressure plate 931, so that the pressure plate 931 can only move in the vertical direction.

[0039] The bottom of the operating frame 1 is provided with an adjustment part, which is used to adjust the two bases 91 to move closer or further apart, so as to place different types of plastic shells of household appliances.

[0040] The adjustment part is used to adjust the distance between the two bases 91 to adapt to different types of plastic shells of household appliances. In this application, the adjustment part includes a motor, a double threaded rod and a groove. The groove is opened at the bottom of the operating frame 1, and the double threaded rod is rotatably installed in the groove. The two bases 91 are respectively threaded on both sides of the surface of the double threaded rod. The motor is used to rotate the double threaded rod. Starting the motor drives the double threaded rod to rotate, thereby realizing the adjustment of the distance between the two bases 91. The surface of the double threaded rod is provided with a sleeve for protection, which has a dustproof effect.

[0041] A pressure sensor 11 is provided between the extrusion seat 3 and the push plate 2;

[0042] Specifically, the pressure sensor 11 is used to monitor the pressure value of the extrusion seat 3 on the plastic shell of the appliance in real time and transmit the data to the control system. The pressure sensor 11 is a piezoresistive pressure sensor 11, which is adapted to the pressure range of the plastic shell of the appliance for bending detection.

[0043] The pressure sensor 11 is a device that converts pressure signals into electrical signals. Its working principle is based on the piezoresistive effect or the strain effect. Taking the common resistance strain gauge pressure sensor 11 as an example, its core component is a strain gauge, which is usually attached to the elastic sensitive element. When the extrusion seat 3 applies pressure to the plastic shell of the household appliance, the elastic element deforms, causing the strain gauge to deform synchronously, thus changing the resistance value of the strain gauge.

[0044] The resistance change is converted into a voltage signal by a Wheatstone bridge circuit, and after being processed by signal conditioning circuits such as amplification and filtering, it is transmitted to the control system. The control system analyzes the real-time pressure data according to preset pressure thresholds or detection standards.

[0045] Real-time monitoring: Continuously collects pressure values ​​and generates pressure-time curves to intuitively reflect the stress changes of the plastic shell during bending resistance testing;

[0046] Feedback control: When the pressure reaches the set value, the control system can instruct cylinder 4 to stop applying pressure or adjust the pressure output to avoid overpressure damage to the sample;

[0047] Data recording and analysis: Stores pressure data to calculate mechanical parameters such as bending strength and elastic modulus of plastic shells, providing a basis for quality assessment.

[0048] In addition, in this application, a sleeve is fixedly installed at the bottom of the protective door 5, and a strip groove for sliding the protective door 5 is provided at the bottom of the operating frame 1. A sliding rod for supporting the sleeve is fixedly installed in the strip groove, and the surface of the sliding rod is movably sleeved with the sleeve.

[0049] The cylinder 4, pressure sensor 11, and motor in the regulating unit involved in this application are all implemented using existing mature technologies and connected to an external PLC controller and power supply. This is a conventional technical means in this field, so the specific circuit connection, control logic, and working process will not be described in detail.

[0050] This device places the plastic casing of the household appliance to be tested on two placement platforms 92, located at the bottom of the pressure plate 931. By rotating the limiting bolt 932, the pressure plate 931 is moved downward to press and fix the plastic casing of the household appliance. The cylinder 4 is activated to move the push plate 2 downward, causing the extrusion seat 3 to move downward. When the push plate 2 moves downward, the two vertical toothed rods 61 move downward, driving the gears 63 to rotate, thereby controlling the rotation of the rod body 64. The gears 63 at both ends of the rod body 64 rotate synchronously, enabling the two horizontal toothed rods 62 to move closer to each other, thereby allowing the two protective doors 5 to move closer to each other and block the opening of the operating frame 1. The two protective doors 5 are staggered and will not collide when they move closer to each other. When the extrusion seat 3 presses the plastic casing, the two protective doors 5 can block the operating frame 1. After the test is completed, the cylinder 4 moves the push plate 2 upward, and the two protective doors 5 move away from each other.

[0051] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the bending strength of plastic casings for household appliances, characterized in that, include: The operating frame (1), push plate (2), extrusion seat (3), cylinder (4), protective door (5) and transmission mechanism (6) are provided. The bottom of the push plate (2) is provided with extrusion seat (3) for extruding the plastic shell of the household appliance. The push plate (2) is slidably installed in the operating frame (1) and used in conjunction with the transmission mechanism (6). The transmission mechanism (6) is used to adjust the push plate (2) and the protective door (5) to move synchronously so as to realize the push plate (2) moving down. The two protective doors (5) are close to each other to seal the operating frame (1). The protective door (5) is slidably installed in the operating frame (1). The cylinder (4) is fixedly installed in the operating frame (1). The bottom extension end of the cylinder (4) is fixed to the surface of the push plate (2).

2. The device for testing the bending strength of plastic casings for household appliances according to claim 1, characterized in that: The transmission mechanism (6) includes a vertical rack (61), a horizontal rack (62), a gear (63), and a rod (64). The rod (64) is rotatably mounted in the operating frame (1) via a fixed seat. Two gears (63) are fixed at both ends of the rod (64). The horizontal rack (62) meshes with the gear (63) near the protective door (5) and its surface is fixed to the surface of the protective door (5). The vertical rack (61) meshes with the gear (63) away from the protective door (5) and its upper end is fixed to the bottom of the push plate (2).

3. The bending strength testing device for plastic casings of household appliances according to claim 2, characterized in that: The operating frame (1) is provided with a protective box (7) for protecting the gear (63). The protective box (7) is slidably installed with the vertical gear (61) and the horizontal gear (62). The surface of the operating frame (1) is provided with a reserved groove (8) for sliding of the vertical gear (61) and the horizontal gear (62).

4. The bending strength testing device for plastic casings of household appliances according to claim 3, characterized in that: The teeth on the surface of the horizontal toothed rod (62) are facing downwards, and a protective plate (10) is provided on the surface to protect the teeth. The teeth on the surface of the vertical toothed rod (61) are located away from the extrusion seat (3).

5. The bending strength testing device for plastic casings of household appliances according to claim 1, characterized in that: It also includes a placement component (9) for fixing the plastic shell of home appliances. The placement component (9) includes a base (91), a placement platform (92) and a limiting component (93). The operating frame (1) is provided with two bases (91). The placement platform (92) is fixedly installed on the top of the base (91). The limiting component (93) is provided on the top of the placement platform (92) to fix the plastic shell of home appliances.

6. The bending strength testing device for plastic casings of household appliances according to claim 5, characterized in that: The limiting component (93) includes a pressure plate (931), a limiting bolt (932), and a guide groove (933). The placement platform (92) has a guide groove (933) on one side for sliding of the pressure plate (931). The limiting bolt (932) is threadedly installed in the placement platform (92) and is rotatably installed with the pressure plate (931).

7. The bending strength testing device for plastic casings of household appliances according to claim 6, characterized in that: The bottom of the operating frame (1) is provided with an adjustment part, which is used to adjust the two bases (91) to move closer or further apart, so as to place different types of plastic shells of household appliances.

8. The device for testing the bending strength of plastic casings for household appliances according to claim 1, characterized in that: A pressure sensor (11) is provided between the extrusion seat (3) and the push plate (2).

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