High-precision multi-direction testing equipment for detecting strength of chair legs

Abstract

The utility model discloses a high-precision multi-direction test device for detecting the strength of chair legs, which comprises a test platform (1), a deformation detector (2), a three-axis automatic moving device (3) and a positioning base (4) are arranged on the test platform (1), a pressing plate seat (5) is arranged on the three-axis automatic moving device (3), a ball cup (51) is arranged on the pressing plate seat (5), a ball screw (52) is connected in the ball cup (51), and the ball screw (52) is connected with the positioning base (4). A lower pressing plate (53) is arranged on the ball head screw (52), a load sensor is arranged at the bottom of the lower pressing plate (53), and a connecting spring (54) is arranged between the lower pressing plate (53) and the pressing plate seat (5); and the positioning base (4) is movably connected with a plurality of limiting rods (42) for positioning a sample to be detected. The device has the characteristics of automatically adjusting the test position and improving the test precision.

Description

Technical Field

[0001] The utility model relates to a chair performance testing device, in particular to a high-precision multi-directional testing device for detecting the strength of chair legs. Background Art

[0002] Home chairs or office chairs are one of the essential appliances in people's lives. They provide comfortable seats for people to rest and play an indispensable role in people's daily lives. Before the chair is used after manufacturing, the structure and connectors of the chair need to undergo certain load tests to ensure that they will not deform, break or be damaged under normal use conditions. During the test, it is necessary to apply pressure in different directions to the back, seat, legs and feet of the chair for strength testing.

[0003] When testing the strength of a chair leg, the legs are usually placed on a test platform and a certain force or stress is applied to the legs to compress them and test their compressive strength. Existing strength testing equipment usually applies pressure downwards using hydraulic or pneumatic pressure, and the location of pressure application is relatively single. If you want to test the strength of other locations, you need to manually adjust the position of the component to be tested; and the angle of the pressure plate is fixed and cannot be adjusted. If there is a certain inclination angle between the test surface of the chair leg and the surface of the pressure plate, it will affect the strength test accuracy of the test surface. Utility Model Content

[0004] The purpose of the utility model is to provide a high-precision multi-directional testing device for detecting the strength of chair legs. The utility model has the characteristics of automatically adjusting the test position and improving the test accuracy.

[0005] The technical solution of the utility model is as follows: a high-precision multi-directional testing device for detecting the strength of chair legs, comprising a testing platform, a deformation detector, a three-axis automatic moving device and a positioning base are arranged on the testing platform, the three-axis automatic moving device is provided with a pressure plate seat, the pressure plate seat is provided with a ball head seat, a ball head screw is connected inside the ball head seat, a lower pressure plate is provided on the ball head screw, a load sensor is provided at the bottom of the lower pressure plate, a connecting spring is provided between the lower pressure plate and the pressure plate seat, one end of the connecting spring is hooked on the pressure plate seat, and the other end of the connecting spring is hooked on the lower pressure plate; a plurality of limit rods for positioning the sample to be tested are movably connected to the positioning base.

[0006] In the aforementioned high-precision multi-directional testing equipment for detecting the strength of chair legs, the three-axis automatic moving device includes a pair of longitudinal moving devices, a transverse moving device is provided between the two longitudinal moving devices, the two ends of the transverse moving device are respectively connected to the slide of the longitudinal moving device, a forward and backward moving device is fixedly connected to the slide of the transverse moving device, and the slide of the forward and backward moving device is connected to the pressure plate seat.

[0007] In the aforementioned high-precision multi-directional testing equipment for detecting the strength of chair legs, the longitudinal moving device, the lateral moving device and the front-rear moving device all adopt an electric screw structure.

[0008] In the aforementioned high-precision multi-directional testing equipment for detecting the strength of chair legs, the bottom of the testing platform is made of ferromagnetic material, and the positioning base is a magnetic base.

[0009] In the aforementioned high-precision multi-directional testing equipment for detecting the strength of chair legs, the limit rod includes a fixed rod located inside the positioning base, the outer sleeve of the fixed rod is provided with a telescopic rod that can be movably extended from the positioning base, and the top of the fixed rod is provided with a telescopic spring connected to the telescopic rod.

[0010] In the aforementioned high-precision multi-directional testing equipment for detecting the strength of chair legs, the deformation detector uses a camera or a laser radar.

[0011] In the aforementioned high-precision multi-directional testing equipment for detecting the strength of chair legs, the testing surface of the lower pressing plate is provided with an anti-slip pad.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model drives the pressure plate seat to move in multiple directions, such as up and down, left and right, front and back, through a three-axis automatic moving device, and adjusts the lower pressure plate to correspond to different positions of the chair legs, so that strength tests can be performed on different positions of the chair legs to detect the weak points of the chair legs; before the lower pressure plate presses the chair legs downward, the connecting spring is first removed, and then the lower pressure plate is rotated, and the angle of the lower pressure plate is adjusted to be parallel to the test surface of the chair legs, and then the connecting spring is installed to maintain the angle of the lower pressure plate during the test, so as to ensure that the pressing surface of the lower pressure plate is fully fitted with the test surface of the chair legs during the test, thereby improving the detection accuracy;

[0014] The position of the chair legs is limited by multiple limit rods, making them stable and accurately positioned, and will not move at will;

[0015] The downward test pressure is detected by the load sensor, and the deformation of the sample under different pressures is detected by the deformation detector, so that the tester can have a clearer understanding of the compressive strength performance of different positions of the chair legs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the connection structure between the pressure plate seat and the lower pressure plate.

[0018] Figure 3 It is a structural schematic diagram of the limit rod.

[0019] Figure 4 It is a schematic diagram of the positioning structure of the limit rod to the chair leg.

[0020] The marks in the accompanying drawings are: 1. test platform; 2. deformation detector; 3. three-axis automatic moving device; 31. longitudinal moving device; 32. lateral moving device; 33. front and rear moving device; 4. positioning base; 42. limit rod; 43. fixing rod; 44. telescopic rod; 45. telescopic spring; 5. pressure plate seat; 51. ball head seat; 52. ball head screw; 53. lower pressure plate; 54. connecting spring; 55. anti-slip pad; 6. chair foot. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example:

[0024] like Figure 1-Figure 4 As shown, a high-precision multi-directional testing equipment for detecting the strength of chair legs comprises a testing platform 1, on which a deformation detector 2, a three-axis automatic moving device 3 and a positioning base 4 are provided, on which a pressure plate seat 5 is provided, on which a ball head seat 51 is provided, in which a ball head screw 52 is connected, on which a lower pressure plate 53 is provided, and at the bottom of the lower pressure plate 53 a load sensor is provided, between the lower pressure plate 53 and the pressure plate seat 5 there is a connecting spring 54, one end of the connecting spring 54 is hooked on the pressure plate seat 5, and the other end of the connecting spring 54 is hooked on the lower pressure plate 53; the positioning base 4 is movably connected with a plurality of limit rods 42 for positioning the sample to be tested.

[0025] During the test, the chair leg 6 to be tested is placed on the positioning base 4, and the position of the chair leg 6 is limited by a plurality of limiting rods 42, so that it is stable and accurately positioned and will not move at will; and the use of a plurality of limiting rods 42 for positioning can be applicable to chair legs 6 of various shapes, with less restrictions;

[0026] The three-axis automatic moving device 3 drives the pressure plate seat 5 to move in multiple directions, such as up and down, left and right, and front and back, and adjusts the lower pressure plate 53 to correspond to different positions of the chair leg 6, so that the strength test can be performed on different positions of the chair leg 6 to detect the weak points of the chair leg 6; before the lower pressure plate 53 presses the chair leg 6 downward, the connecting spring 54 is first removed, and then the lower pressure plate 53 is rotated, and the angle of the lower pressure plate 53 is adjusted to be parallel to the test surface of the chair leg 6, and then the connecting spring 54 is installed to maintain the angle of the lower pressure plate 53 during the test, so as to ensure that the pressing surface of the lower pressure plate 53 is fully fitted with the test surface of the chair leg 6 during the test, thereby improving the detection accuracy;

[0027] The test pressure of the downward pressure is detected by the load sensor, and the deformation of the sample under different pressures is detected by the deformation detector 2, and the information can be output to the display screen, and displayed on the display screen through three-dimensional or data charts, so that the tester can be more clear about the compressive strength performance of different positions of the chair leg 6. When the deformation limit or rupture of the chair leg is detected, the three-axis automatic moving device 3 can be controlled to stop the downward pressure test.

[0028] The three-axis automatic moving device 3 includes a pair of longitudinal moving devices 31, a transverse moving device 32 is provided between the two longitudinal moving devices 31, the two ends of the transverse moving device 32 are respectively connected to the slide of the longitudinal moving device 31, a front and rear moving device 33 is fixedly connected to the slide of the transverse moving device 32, and the slide of the front and rear moving device 33 is connected to the pressure plate seat 5.

[0029] The longitudinal moving device 31, the lateral moving device 32 and the front-back moving device 33 all adopt an electric screw structure. The electric screw structure is used to control the moving distance, and the pulse amount of the motor in the three-axis automatic moving device 3 is precisely controlled to achieve fine and precise movement and accurate test position.

[0030] The bottom of the test platform 1 is made of ferromagnetic material, and the positioning base 4 is a magnetic base. When the positioning base 4 needs to be fixed, the positioning base 4 is powered on to have magnetism, and is attracted and fixed to the test platform 1; when the positioning base 4 needs to be moved, the positioning base 4 is powered off to lose magnetism, so that the positioning base can be freely moved and the position of the positioning base 4 can be adjusted, which is convenient for the placement and testing of chair legs 6 of different shapes.

[0031] The limiting rod 42 includes a fixed rod 43 located inside the positioning base 4, a telescopic rod 44 that movably extends out of the positioning base 4 is sleeved on the outside of the fixed rod 43, and a telescopic spring 45 connected to the telescopic rod 44 is provided on the top of the fixed rod 43. When the telescopic rod 44 is not subjected to force, the telescopic rod 44 is pushed out of the positioning base 4 under the action of the telescopic spring 45 to limit the chair legs 6 placed on the positioning base 4; when the telescopic rod 44 is subjected to external pressure, the telescopic rod 44 retracts downward into the interior of the positioning base 4 and does not interfere with the chair legs 6.

[0032] The deformation detector 2 uses a camera or a laser radar, which can display images and make the detection more intuitive.

[0033] The test surface of the lower pressing plate 53 is provided with an anti-skid pad 55. The friction between the lower pressing plate 53 and the test surface of the chair leg 6 is increased to avoid sliding and deflection when the pressure is small at the beginning of the test, which affects the accuracy of the test.

[0034] Working principle: Figure 4 As shown, the five-star chair foot is placed on the positioning base 4, and the positions of both sides of each support leg of the five-star chair foot are limited by a plurality of limiting rods 42, and the remaining limiting rods 42 are retracted into the positioning base 4 and hidden under the pressure of the five-star chair foot;

[0035] The three-axis automatic moving device 3 drives the pressure plate seat 5 to move in multiple directions, such as up and down, left and right, and front and back, and adjusts the lower pressure plate 53 to correspond to different positions of the five-star chair legs to perform strength tests; before the lower pressure plate 53 presses down the five-star chair legs, first remove the connecting spring 54, then rotate the lower pressure plate 53, adjust the angle of the lower pressure plate 53 to make it parallel to the test surface of the chair leg 6, and then install the connecting spring 54 to maintain the angle of the lower pressure plate 53 during the test, to ensure that the pressing surface of the lower pressure plate 53 is fully fitted with the test surface of the chair leg 6 during the test, thereby improving the detection accuracy;

[0036] The downward test pressure is detected by the load sensor, and the deformation of the sample under different pressures is detected by the deformation detector 2. The detection information is output to the display screen and displayed on the display screen through three-dimensional or data charts, so that the test personnel can better understand the compressive strength performance of different positions of the five-star chair legs.

Claims

1. High-precision multi-directional testing equipment for testing the strength of chair legs, characterized by: The invention comprises a test platform (1), wherein the test platform (1) is provided with a deformation detector (2), a three-axis automatic moving device (3) and a positioning base (4), wherein the three-axis automatic moving device (3) is provided with a pressure plate seat (5), wherein the pressure plate seat (5) is provided with a ball head seat (51), wherein a ball head screw (52) is connected inside the ball head seat (51), wherein a lower pressure plate (53) is provided on the ball head screw (52), wherein a load sensor is provided at the bottom of the lower pressure plate (53), wherein a connecting spring (54) is provided between the lower pressure plate (53) and the pressure plate seat (5), wherein one end of the connecting spring (54) is hooked on the pressure plate seat (5), and the other end of the connecting spring (54) is hooked on the lower pressure plate (53); and the positioning base (4) is movably connected with a plurality of limit rods (42) for positioning the sample to be tested.

2. The high-precision multi-directional testing device for detecting the strength of chair legs according to claim 1, characterized in that: The three-axis automatic moving device (3) includes a pair of longitudinal moving devices (31), a transverse moving device (32) is provided between the two longitudinal moving devices (31), the two ends of the transverse moving device (32) are respectively connected to the slide of the longitudinal moving device (31), a front-rear moving device (33) is fixedly connected to the slide of the transverse moving device (32), and the slide of the front-rear moving device (33) is connected to the pressure plate seat (5).

3. The high-precision multi-directional testing device for detecting the strength of chair legs according to claim 2, characterized in that: The longitudinal moving device (31), the lateral moving device (32) and the front-rear moving device (33) all adopt an electric screw structure.

4. The high-precision multi-directional testing device for testing the strength of chair legs according to claim 1, characterized in that: The bottom of the test platform (1) is made of ferromagnetic material, and the positioning base (4) is a magnetic base.

5. The high-precision multi-directional testing device for testing the strength of chair legs according to claim 1, characterized in that: The limiting rod (42) comprises a fixed rod (43) located inside the positioning base (4), a telescopic rod (44) movably extending out of the positioning base (4) is sleeved on the outside of the fixed rod (43), and a telescopic spring (45) connected to the telescopic rod (44) is provided on the top of the fixed rod (43).

6. The high-precision multi-directional testing device for testing the strength of chair legs according to claim 1, characterized in that: The deformation detector (2) adopts a camera or a laser radar.

7. The high-precision multi-directional testing device for testing the strength of chair legs according to claim 1, characterized in that: The test surface of the lower pressing plate (53) is provided with an anti-slip pad (55).

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