Rubber particle prepressing instrument for ground layer of synthetic material playground

Abstract

The utility model discloses a rubber particle pre-pressing instrument for a synthetic material playground surface layer, which solves the problem of rubber particle pre-pressing when the elastic property of the synthetic material surface layer rubber particles is tested. The particle container is positioned on the test table board; the lower jig is located at the bottom of the particle container and used for cooperatively adjusting the position of the particle container; the lead screw is perpendicular to the test table board, and a nut of the lead screw is connected with a transversely-arranged main shaft; the upper jig is mounted on the main shaft, is positioned above the particle container, and can extend into the particle container to pre-press the rubber particles under the driving of the screw rod; the pressure sensor is used for sensing the pressure of the rubber particles in the particle container pre-pressed by the upper jig; the motor drives the lead screw; and the controller is connected with the motor and the pressure sensor so as to control the motor to drive the screw rod to move to move the upper jig into the particle container to pre-press the rubber particles, and the pressure sensor is used for sensing the pressure, so that the pre-pressing pressure and time reach set values.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of synthetic material sports ground surface layer rubber particle pre-pressing instrument. BACKGROUND

[0002] Synthetic material surface layer has the characteristics of good elasticity, high compressive strength, appropriate hardness, stable physical properties, wear resistance and slip resistance, flexible design, convenient maintenance, simple construction, bright color, strong ultraviolet resistance and aging resistance, etc., and has become the internationally recognized best all-weather indoor and outdoor sports ground material and is widely used. Synthetic material surface layer runway includes polyurethane prepolymer, mixed polyether, waste tire rubber, EPDM rubber particles or PU particles, pigments, additives, fillers, etc. Rubber particles, as the composition particles of synthetic material surface layer, are elastomers prepared by blending plastic and rubber, and are particles obtained by extrusion granulation or crushing granulation in process.

[0003] The national standard GB36246-2018 limits the organic composition, harmful substance limit and volatile gas of the raw material particles of synthetic material surface layer sports ground, but does not give a definite provision for the elastic properties of the particles. The content of organic matter in synthetic material surface layer rubber particles cannot represent the advantages and disadvantages of elastic properties. Athletes are prone to joint damage and affect sports performance when exercising on the surface layer with poor elasticity. To test the elastic properties of synthetic material surface layer rubber particles, an instrument capable of pre-pressing rubber particles is needed. SUMMARY

[0004] The utility model provides a kind of synthetic material sports ground surface layer rubber particle pre-pressing instrument, at least can pre-press rubber particles in the process of testing the elastic properties of synthetic material surface layer rubber particles.

[0005] According to an aspect of the embodiment, a synthetic material sports ground surface layer rubber particle pre-pressing instrument includes a test table, a particle container containing rubber particles located on the test table, a lower jig located at the bottom of the particle container for adjusting the position of the particle container, a lead screw vertically arranged perpendicular to the test table, a main shaft transversely arranged connected to the nut of the lead screw, an upper jig installed on the main shaft above the particle container, which can be extended into the particle container to pre-press the rubber particles under the drive of the lead screw, a pressure sensor located between the upper jig and the main shaft, which senses the pressure of the rubber particles pre-pressed by the upper jig in the particle container, a motor driving the lead screw, and a controller connected to the motor and the pressure sensor to control the motor to drive the lead screw to move the upper jig into the particle container to pre-press the rubber particles, and the pressure sensor senses the pressure to make the pre-pressing pressure and time reach the set value.

[0006] In some examples, the lead screw has an encoder detecting the number of rotations and the angle of rotation of the lead screw, and the encoder is connected to the controller.

[0007] In some examples, the upper jig has a limit switch at each of the two limit positions of the upper jig, and the limit switch is connected to the controller, and when the limit switch senses that the upper jig is at the limit position, the controller controls the motor to stop the movement of the lead screw.

[0008] In some examples, the test table has a guide rail guiding the movement of the lower jig, and the lower jig can move under the guidance of the guide rail to adjust the particle container to align with the upper jig.

[0009] In some examples, the test table is surrounded by a fence, and the fence has a safety window that can be opened to take and place the particle container.

[0010] In some examples, the upper jig pre-presses the rubber particles at a pressure of 100 kg.

[0011] In some examples, the upper jig pre-presses the rubber particles at a pressure of 100 kg and a speed of 300 mm / min.

[0012] In some examples, the upper jig first pre-presses the rubber particles at a first standard pressure at a certain speed for a set period of time, then stops pre-pressing and waits for a set period of time, and then pre-presses the rubber particles at a second standard pressure at a certain speed for a set period of time.

[0013] In some examples, the controller is connected to a display screen configured to display one or more combinations of the following information: the pressure of the pre-pressed rubber particles, the time of the pre-pressed rubber particles, and the movement speed of the upper jig, and the rebound height of the rubber particles after stopping pre-pressing.

[0014] In some examples, the upper jig has a diameter of 45 mm, the particle container has an inner diameter of 45 mm, and the gap between the upper jig and the particle container is 0.05 mm. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a synthetic material sports field surface layer rubber particle pre-pressing instrument schematic diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0016] The synthetic material sports field surface layer rubber particle pre-pressing instrument of the present application is suitable for all types of sports field and synthetic material surface layer rubber particles used on the footpath, including but not limited to bottom layer rubber particles, surface layer rubber particles and filling rubber particles used in synthetic material surface layer.

[0017] Figure 1A synthetic material sports ground surface layer rubber particle pre-pressing instrument is shown, which comprises: a visual safety window 1, a pressure sensor 2, an upper jig 3, a particle container 4, a lower jig 5, a lead screw 6, and a stepping motor 7.

[0018] The upper jig 3 and the lower jig 5 assist in positioning the particle container 4 and compressing the rubber particles in the particle container 4. The particle container 4 is cylindrical and is used to contain the rubber particles. The lower jig 5 is located at the bottom of the particle container 4. The testing table 13 of the instrument has a pair of guide rails 12, and the lower jig 5 can slide on the guide rails 12 to adjust the position of the particle container 4 to align with the upper jig 3. That is, the lower jig 5 is a sliding block matched with the guide rails 12. In an embodiment, the lower jig 5 is a part extending from the bottom of the particle container 4, that is, the particle container lower jig 5 is integrated with the particle container 4.

[0019] The lead screw 6 is vertically arranged and perpendicular to the testing table 13, and is driven by the stepping motor 7. In an embodiment, the lead screw 6 adopts a C5 grade grinding lead screw. The nut of the lead screw 6 is connected with a horizontally arranged main shaft, and the upper jig 3 located above the particle container 4 is installed on the main shaft. The pressure sensor 2 is arranged between the upper jig 3 and the main shaft. Under the driving of the stepping motor 7, the lead screw 6 can drive the upper jig 3 to enter the particle container 4 to pre-press the rubber particles, the pressure sensor 2 senses the pressure, and after the pre-pressing is completed, the lead screw 6 drives the upper jig 3 to retreat and separate from the rubber particles. In terms of appearance, the upper jig 3 is generally cylindrical.

[0020] The upper jig 3, the particle container 4, the lower jig 5, and the testing table 13 can be made of stainless steel.

[0021] The instrument also includes a control system, which controls the movement of the upper jig 3 and the pressure of the upper jig 3 on the rubber particles. The control system comprises a controller, an encoder, a limit switch, a stepping motor driving circuit, an emergency stop switch 9, an operation button 10, and a display screen 11. The controller is connected with the limit switch, the stepping motor driving circuit, the emergency stop switch 9, the operation button 10, and the display screen 11 to collect signals or control each part.

[0022] The controller is configured to perform the following steps: sending a signal to the stepping motor driving circuit to make the lead screw 6 drive the upper jig 3 to enter the particle container 4 to pre-press the rubber particles, sensing the pressure through the pressure sensor 2, making the lead screw 6 drive the upper jig 3 to retreat when the pre-pressing time and the pressure reach the set value (the rubber particles will rebound), monitoring the rotation number and angle of the lead screw 6 by using the encoder, calculating the distance of the retreat of the upper jig 3 based on the lead pitch of the lead screw 6 and the rotation number and angle data of the lead screw 6 collected by the encoder when the pressure sensed by the pressure sensor 2 is 0 (that is, the upper jig 3 separates from the rubber particles), and comparing the rebound value with a reference value to obtain the equivalent elasticity of the rubber particles.

[0023] The resilience (equivalent elasticity) of the synthetic material sports surface layer rubber granules is calculated according to formula (1), with data accurate to two decimal places.

[0024]

[0025] In the formula: R m Resilience of the synthetic material rubber granules, in %, H f is the rebound height (rebound value), in mm; H i is the reference value of the equivalent elasticity, in mm. In one embodiment, the reference value H i is 22.75 mm, the relative height of the granules with a mass of 30 g, a particle size of 1.8 mm to 2.2 mm, and a rubber content of 20% after pre-pressing at 100 kg in a container with a diameter of 50 mm.

[0026] In another embodiment, the upper jig is first pre-pressed at a certain speed using a first standard pressure for a set period of time, then stopped and waits for a set period of time, and then pre-pressed at a certain speed using a second standard pressure for a set period of time. For example, first pre-press the rubber granules at a speed of 300 mm / min using a pressure of 100 kg, wait for 60 s, then raise the upper jig to a set distance and wait for 60 s, then pre-press the rubber granules at a speed of 300 mm / min using a pressure of 70 kg, and finally measure the rebound value of the rubber granules.

[0027] Limit switches are arranged at the two limit positions of the up-and-down movement of the upper jig 3. When the limit switches sense that the upper jig 3 has moved to the limit position, the controller sends a command to the stepper motor drive circuit to stop the movement of the upper jig 3, so as to avoid collision and damage to the pressure sensor 2, the upper jig 3, the granule container 4, etc.

[0028] When the emergency stop switch 9 is pressed, the controller sends a command to the stepper motor drive circuit to stop the movement of the upper jig 3.

[0029] The operation keys 10 can be multiple, including but not limited to: keys for adjusting the distance of the upward movement of the upper jig 3, keys for adjusting the distance of the downward movement of the upper jig 3, keys for adjusting the pre-pressing pressure of the rubber granules by the upper jig 3, and keys for adjusting the pre-pressing time of the rubber granules by the upper jig 3.

[0030] The display screen 11 displays a combination of one or more of the following information, including but not limited to: the pre-pressing pressure of the rubber granules, the pre-pressing time of the rubber granules, the reference value, the rebound value of the rubber granules, the equivalent elasticity of the rubber granules, and the movement speed of the upper jig.

[0031] The instrument can also be connected to a computer, on which the movement of the upper fixture is controlled, for example the position of the upper fixture, the pre-pressing force of the rubber particles, the pre-pressing time of the rubber particles. The information displayed on the display screen 11 can also be transmitted to the computer for display and storage.

[0032] In addition, the bottom of the instrument is provided with a base 8. In order to ensure the safety of the test, a fence is arranged around the test table 13, and a visible safety window 1 which can be opened is left on the fence, through which the user can observe the test process, and the visible safety window 1 can be opened to take and place the particle container 4.

Claims

1. A pre-compression instrument for rubber granules on the surface layer of a synthetic sports field, characterized in that, include: Test platform; A granule container for holding rubber granules, located on the test platform; The lower fixture is located at the bottom of the pellet container and is used to adjust the position of the pellet container. The lead screw is arranged vertically and perpendicular to the test platform. The nut of the lead screw is connected to the horizontally arranged main shaft. The upper fixture is mounted on the main shaft and located above the granule container. Driven by the lead screw, it can extend into the granule container to pre-compress the rubber granules. A pressure sensor, located between the upper fixture and the main shaft, senses the pressure of the rubber particles inside the pre-compressed particle container of the upper fixture. The electric motor, which drives the lead screw; as well as The controller connects to the motor and the pressure sensor to control the motor to drive the lead screw to move the upper fixture into the granule container to pre-compress the rubber granules, and senses the pressure through the pressure sensor to ensure that the pre-compression pressure and time reach the set values.

2. The pre-compression instrument for rubber granules on the synthetic material sports field surface layer according to claim 1, characterized in that, The lead screw has an encoder that detects its number of rotations and angle, and the encoder is connected to the controller.

3. The pre-compression instrument for rubber granules on the synthetic material sports field surface layer according to claim 1, characterized in that, The upper fixture has limit switches at the two extreme positions of its vertical movement. These limit switches are connected to the controller. When the limit switch senses that the upper fixture is at its extreme position, the controller controls the motor to stop the movement of the lead screw.

4. The pre-compression instrument for rubber granules on the synthetic material sports field surface layer according to claim 1, characterized in that, The test platform has guide rails that guide the movement of the lower fixture. The lower fixture can move under the guidance of the guide rails to adjust the particle container so that it is aligned with the upper fixture.

5. The pre-compression instrument for rubber granules on the synthetic material sports field surface layer according to claim 1, characterized in that, The test platform is surrounded by a fence with a visible safety window that can be opened to access the particle container.

6. The pre-compression instrument for rubber granules on the synthetic material sports field surface layer according to claim 1, characterized in that, The upper fixture is pre-pressed with 100 kg of pressure onto rubber granules.

7. The pre-compression instrument for rubber granules on synthetic sports field surface as described in claim 6, characterized in that, The upper fixture pre-compresses the rubber granules with a pressure of 100 kg and a speed of 300 mm / min.

8. The pre-compression instrument for rubber granules on the synthetic material sports field surface layer according to claim 1, characterized in that, The upper fixture first uses the first standard pressure to pre-compress the rubber particles at a certain speed for a set time, then stops pre-compressing and waits for the set time, and then uses the second standard pressure to pre-compress the rubber particles at a certain speed for a set time.

9. The pre-compression instrument for rubber granules on the surface of a synthetic sports field according to claim 1, characterized in that, The controller is connected to a display screen configured to display a combination of one or more of the following information: the pressure of the pre-compressed rubber granules, the time of pre-compressing the rubber granules and the movement speed of the upper fixture, and the rebound height of the rubber granules after the pre-compressing stops.

10. The pre-compression instrument for rubber granules on the surface of a synthetic sports field according to claim 1, characterized in that, The upper fixture has a diameter of 45mm, the inner diameter of the particle container is 45mm, and the clearance between the upper fixture and the particle container is 0.05mm.

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