Rapid screening device for spring stiffness

Abstract

The utility model relates to a rapid spring stiffness screening device, and belongs to the field of design of detection devices. The screening device comprises an actuating cylinder body, a piston platform, a displacement indicating pointer, a connecting pipeline, an air pump, a measuring back plate, a movable marking line and a door-frame-shaped frame. A plurality of piston platforms which are equal in height and can lift synchronously extend out of the upper end surface of the actuating cylinder body; the air pump is communicated with the actuating cylinder body through a connecting pipeline and provides lifting power for the piston platform; the piston platform is used for installing a spring, the side face of the piston platform is provided with a displacement pointer pointing upwards, and a door-frame-shaped frame is installed above the actuating cylinder body. A measuring back plate is upwards mounted on the side surface of the mounting door-frame-shaped frame and is provided with a movable marking line; the movable marking line is used for indicating the upper and lower limits of the height of the displacement pointer so as to indicate whether the measured piece is qualified.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spring stiffness rapid screening device belongs to detection device design field. BACKGROUND

[0002] Spring is an important element in industrial system, has great use in buffering, shock absorption, storage and release of energy etc., such as automobile shock absorbing spring, bumper spring, watch spring, bolt spring etc. Spring is various, such as tensile spring, torsional spring and compression spring etc., wherein widely used tensile spring, compression spring is a kind of helical spring bearing axial force, there is a certain gap between the coil and coil of spring, when being subjected to external load, spring deforms, stores deformation energy. Figure 1 As shown in the figure, before spring is used, according to the requirement in GB / T1239.1-2009, GB / T1239.2-2009, need pass through the force value variation F under the specified deformation x, obtain its spring stiffness k, namely k=F / x, reach the purpose of screening spring.

[0003] In actual work, the spring stiffness of the measured spring is generally determined by spring testing machine, due to the influence of testing machine principle and structure, spring testing machine can only complete the test of one measured spring each time, for large quantities of detection task, there is the problem of low efficiency and long time consumption. UTILITY MODEL CONTENT

[0004] The utility model provides a spring stiffness rapid screening device and method to solve the problem of low test efficiency and long time consumption when screening large quantities of spring using spring testing machine.

[0005] Technical scheme:

[0006] Provide a kind of spring stiffness rapid screening device, it include: actuating cylinder body, piston platform, displacement indicating needle, connecting pipeline, air pump, measuring backboard, movable mark line, door frame frame;

[0007] Multiple synchronous lifting piston platforms are protruded on the upper end surface of actuating cylinder body;Air pump is communicated with actuating cylinder body by connecting pipeline, provides the power for the lifting of piston platform;Piston platform is used for installing spring, the side of piston platform is provided with upward displacement indicating needle, and door frame frame is installed above actuating cylinder body;Measuring backboard is installed upward on the side of installing door frame frame, and measuring backboard is provided with movable mark line;Movable mark line is used to indicate the height limit of displacement indicating needle, to indicate whether the measured piece is qualified.

[0008] Door frame frame includes: upper crossbeam, side support plate;

[0009] Upper crossbeam is installed on actuating cylinder body by two side support plates.

[0010] The side plate fixing bolts secure the upper crossbeam and side support plate, and the side support plate and actuating cylinder body.

[0011] The measuring backplate is fastened to the upper crossbeam by backplate fixing bolts.

[0012] The upper limit of the height of the displacement indicator needle represents the maximum required deformation of the spring.

[0013] The lower limit of the height of the displacement indicator needle represents the minimum required deformation of the spring.

[0014] Beneficial effects:

[0015] 1. This method is simple and convenient to operate. By increasing the number of piston platforms, multiple springs can be screened simultaneously, improving screening efficiency. 2. During screening, only the position of the displacement indicator needle needs to be observed to determine whether the spring being tested is qualified, further improving screening efficiency. 3. The load application range of this method is no longer limited by the number of testing machines or personnel, improving screening efficiency. 4. For a large batch of springs, only one calculation process needs to be completed, and then the air pressure P1 can be applied repeatedly to repeat the screening process, which is simple and efficient. 5. The device has a modular design, and different sizes of side plates, back plates, etc., can be replaced according to the size of the spring to complete the screening work. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of load testing for a cylindrical compression spring.

[0017] Figure 2 This is a schematic diagram of a rapid spring stiffness screening device.

[0018] Among them, 1-actuating cylinder, 2-piston platform, 3-displacement indicator needle, 4-upper crossbeam, 5-connecting pipe, 6-air pump, 7-side support plate, 8-side plate fixing bolt, 9-measuring back plate, 10-movable marking line, 11-marking line bolt, 12-back plate fixing bolt. Detailed Implementation

[0019] The spring stiffness screening device of this utility model is as follows: Figure 2 As shown, it mainly includes an actuating cylinder 1, a piston platform 2, a displacement indicator needle 3, an upper crossbeam 4, a connecting pipe 5, an air pump 6, a side support plate 7, side plate fixing bolts 8, a measuring back plate 9, a movable marking line 10, a marking line bolt 11, and a back plate fixing bolt 12.

[0020] Piston platform 2 is installed in the inner cylinder of actuating cylinder body 1 in turn, and actuating cylinder body 1 is connected with air pump 6 through connecting pipeline 5; upper cross beam 4 is connected with actuating cylinder body 1 through 8 side plate fixing bolts 8 respectively through side support plate 7, and upper cross beam 4 can be adjusted in position up and down along the slot in side support plate 7; measuring back plate 9 is connected with upper cross beam 4 through back plate fixing bolt 12; two movable marker lines 10 are fixed on measuring back plate 9 through marker line bolt 11, and can move up and down; displacement indicating needle 3 is connected with piston platform 2 through screw thread, and is guaranteed to be perpendicular to movable marker line 10;

[0021] The device realizes the up and down actuation of piston platform 2 by air pump 6 to apply different pressure to actuating cylinder body 1.

[0022] The spring stiffness screening method of the utility model:

[0023] I. According to the relationship between piston bottom area S and pressure P P=F / S, the force value F applied according to the test requirement is converted into air pump 6 pressure P;

[0024] II. According to the minimum stiffness k min and maximum stiffness k max of the spring stiffness screening range given by the customer, the corresponding deformation amount X min and X max of the spring when the force value F is applied are calculated by using Hooke's law y=kx;

[0025] III. The minimum and maximum actual positions X min and X max of displacement indicating needle 3 on measuring back plate 9 when the force value F is applied are calculated, and the scale line on measuring back plate 9 and the two movable marker lines 10 are used for marking;

[0026] IV. The measured spring is placed on piston platform 2 respectively, and after adjusting upper cross beam 4 to contact with the upper end surface of the measured spring, upper cross beam 4 is fixed;

[0027] V. The pressure P is applied to actuating cylinder body 1 through air pump 6, so that the measured spring is compressed or stretched correspondingly.

[0028] VI. The position of displacement indicating needle 3 on measuring back plate 9 is visually inspected, and the measured spring outside the two movable marker lines 10 is unqualified spring, and the rest are screened.

Claims

1. A rapid screening device based on spring stiffness, characterized in that, include: Actuating cylinder (1), piston platform (2), displacement indicator (3), connecting pipe (5), air pump (6), measuring back plate (9), movable marking line (10), door frame; Multiple piston platforms (2) of equal height extend from the upper end face of the actuating cylinder (1) and can be raised and lowered synchronously; the air pump (6) is connected to the actuating cylinder (1) through the connecting pipe (5) to provide the power for raising and lowering the piston platforms (2); springs are installed on the piston platforms (2), and upward displacement indicator needles (3) are set on the side of the piston platforms (2). A door frame is installed above the actuating cylinder (1); a measuring back plate (9) is installed upward on the side of the door frame, and a movable marking line (10) is set on the measuring back plate (9); the movable marking line (10) is used to indicate the upper and lower limits of the height of the displacement indicator needle (3) to indicate whether the measured part is qualified.

2. The apparatus according to claim 1, characterized in that, The door frame includes: an upper crossbeam (4) and side support plates (7); The upper crossbeam (4) is mounted on the actuating cylinder (1) via the side support plates (7) on both sides.

3. The apparatus according to claim 1, characterized in that, The side plate fixing bolts (8) fasten the upper crossbeam (4) and the side support plate (7), the side support plate (7) and the actuating cylinder (1).

4. The apparatus according to claim 3, characterized in that, The measuring back plate (9) is fastened to the upper crossbeam (4) by the back plate fixing bolts (12).

5. The apparatus according to claim 1, characterized in that, The upper limit of the height of the displacement indicator needle (3) represents the maximum required deformation of the spring.

6. The apparatus according to claim 1, characterized in that, The lower limit of the height of the displacement indicator needle (3) represents the minimum required deformation of the spring.

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