Braking device of temperature difference test chamber and temperature difference test chamber

Abstract

A braking device for a temperature difference test chamber and the test chamber itself are disclosed. The braking device effectively brakes the swing arm shaft, keeping it suspended for extended periods. The prototype has shown excellent performance after a year of use. The braking device uses a method where brake components press against a brake sleeve, resulting in a large contact area, good braking effect, and low braking force. It utilizes an accumulator, a first spring, and a second spring to provide braking force sufficient for a fully loaded basket, and features a simple structure and good performance. Furthermore, a brake actuator drives the brake components to rotate, switching between braking and release states; this design is simple and reliable. An electromagnet is added, using a coil-generated magnetic field in conjunction with a magnet to achieve rapid braking, improving braking effect while reducing wear on the brake components and brake sleeve. Additionally, a motor brake can be installed on the motor's output shaft to brake it.

Description

Technical Field

[0001] This utility model relates to the suspension technology of a temperature difference test chamber, and in particular to a braking device and a temperature difference test chamber. Background Technology

[0002] The applicant disclosed a temperature difference test chamber in Chinese invention patent publication number CN115372193B, which uses a motor to drive a basket to repeatedly immerse itself between cold and hot water for testing. The transmission device controlling the swing of the basket is a reducer. The reducer works by the driving gear transmitting power to the driven gear through tooth meshing, and then driving the basket to swing through sprockets, chains, etc. When the machine is stopped, the basket needs to be suspended in the air. At this time, the driven gear is out of control. Due to factors such as long-term wear and tear between the teeth, the driven gear causes the driving gear to rotate in the opposite direction. Especially when the temperature difference chamber basket is overloaded, without a braking device, the basket will slowly fall into the water over time, affecting subsequent tests.

[0003] Therefore, how to achieve automatic braking and automatic release of the swing arm shaft or swing arm is a technical problem that needs to be solved. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a braking device for a temperature difference test chamber and a temperature difference test chamber, wherein the braking device is capable of automatically braking and automatically releasing the swing arm shaft.

[0005] To achieve the above objectives, this utility model provides a braking device for a temperature difference test chamber, including a brake housing and a brake frame, wherein the brake frame is mounted on the brake housing; a swing arm shaft passes through the brake frame and the brake housing, and a brake sleeve is installed on the portion of the swing arm shaft located inside the brake frame, the brake sleeve pressing against the brake element for braking; one end of the brake element is hinged to the brake frame via a brake pivot, and a connecting portion is installed on the other end, the connecting portion being hinged to a piston shaft via a second pivot; the other end of the piston shaft is inserted into the piston chamber of the brake cylinder and assembled with the piston, the piston and the piston chamber are sealed and slidably assembled, and a first spring is installed in the piston chamber between the inner end faces of the piston and the rodless chamber; the outer shell of the brake cylinder is hinged to the brake frame or the brake housing;

[0006] The connecting part is hinged to the brake telescopic shaft via a first rotating shaft, and the brake telescopic shaft is installed inside the brake actuator. The brake actuator can be an electromagnet, an electric cylinder, a hydraulic cylinder, etc., as long as it can drive the brake telescopic shaft to move axially to achieve the switching between the braking state and the brake release state.

[0007] As a further improvement of this utility model, a brake cylinder block is provided on the end of the brake cylinder away from the piston shaft, and the brake cylinder block is hinged to the brake frame through another second rotating shaft.

[0008] As a further improvement of this utility model, an accumulator is installed on the brake frame or brake housing; the piston chamber is connected to the outlet of the accumulator, and the accumulator is filled with compressed gas or hydraulic oil.

[0009] As a further improvement of this utility model, the accumulator includes an air nozzle, an air bladder, an energy storage piston, an energy storage chamber, and an energy storage shell. The energy storage shell contains an energy storage chamber, which is sealed and slidably assembled with the energy storage piston. The energy storage piston is pressed against the air bladder. The air bladder is hollow inside and connected to the air nozzle. The energy storage chamber is connected to the output pipe, and the output pipe is connected to the piston chamber. The air bladder is elastic.

[0010] As a further improvement of this utility model, there are two braking components. An electromagnet block is provided on the outer shell of the electromagnet, and the electromagnet block is hinged to the connecting part of the other braking component through the first rotating shaft.

[0011] As a further improvement of this utility model, the connecting part is assembled or pressed with one end of the second spring, and the other end of the second spring is assembled or pressed with the brake frame.

[0012] As a further improvement of this utility model, an electromagnet is also installed inside the brake housing, an electromagnetic shaft is installed inside the electromagnet, and a coil is fitted outside the electromagnetic shaft; an electromagnetic base is installed on the part of the swing arm shaft that passes through the electromagnet and is located inside the electromagnet, and a magnet is installed on the electromagnetic base.

[0013] As a further improvement of this utility model, an encoder is also installed on the swing arm shaft. The encoder is used to detect the rotation angle of the swing arm shaft. The encoder is installed inside the outer cover, and the outer cover is installed on the brake housing.

[0014] As a further improvement of this utility model, one end of the motor's output shaft extends out of the motor and is assembled with a motor brake, which is mounted on the motor. The motor brake can be an electromagnetic power-off brake, which is an existing product with mature technology.

[0015] This utility model also discloses a temperature difference test chamber, which includes the above-mentioned braking device.

[0016] The beneficial effects of this utility model are:

[0017] The braking device of this invention can effectively brake the swing arm shaft, thus keeping it in a suspended position for extended periods. The prototype has been in use for a year with excellent results. The braking device uses a method of pressing the brake element against the brake sleeve, resulting in a large contact area, good braking effect, and low braking force. Simultaneously, it utilizes an accumulator, a first spring, and a second spring to provide braking force, sufficient even when the basket is fully loaded. The structure is simple and effective. Furthermore, a brake actuator drives the brake element to rotate, switching between braking and release states; this design is simple and reliable. The addition of an electromagnet utilizes the magnetic field generated by the coil in conjunction with a magnet to achieve rapid braking, improving braking effect while reducing wear on the brake element and brake sleeve. Additionally, a motor brake can be installed on the motor's output shaft to further improve braking effect and reduce the impact on the output shaft after braking the swing arm shaft, thus extending the motor's lifespan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0020] Figure 3 This is a partial structural schematic diagram of the present invention;

[0021] Figure 4 This is a structural diagram of the motor 230, reducer 220, suspended platform 310, and braking device 400.

[0022] Figure 5 This is a cross-sectional view of the braking device 400 located at the center plane of the axis of the swing arm shaft 340;

[0023] Figure 6 yes Figure 5 Sectional view at point AA;

[0024] Figure 7 yes Figure 5 Sectional view at point BB;

[0025] Figure 8 This is a schematic diagram of the structure of part 400 of the braking device. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the structure of part 400 of the braking device. Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the structure of part 400 of the braking device. Figure 3 ;

[0028] Figure 11 This is a schematic diagram of the structure of part 400 of the braking device. Figure 4 ;

[0029] Figure 12 This is a partial structural diagram of the electromagnetic base 480 and coil 510. Figure 1 ;

[0030] Figure 13 This is a partial structural diagram of the electromagnetic base 480 and coil 510. Figure 2 ;

[0031] Figure 14 This is a schematic diagram of the accumulator 540. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] See Figures 1-13 The temperature difference test chamber in this embodiment includes a chamber body 110 and a hanging basket 310. A cold water tank 110 and a hot water tank 120 are installed inside the chamber body 110, and the cold water tank 110 and the hot water tank 120 are respectively filled with cold water and hot water.

[0034] The housing 100 and the swing arm shaft 340 are rotatably assembled. One end of the swing arm shaft 340 is inserted into the braking device 400 and a swing arm 330 is mounted on the swing arm shaft 340. A basket shaft 320 is rotatably mounted on the swing arm 330 and a basket 310 is mounted on the basket shaft 320. The basket 310 is used to hold the test sample.

[0035] A second sprocket 252 is mounted on the swing arm shaft 340. A chain 250 passes around the second sprocket 252 and the first sprocket 251 to form a chain drive mechanism. The first sprocket 351 is mounted on the output shaft 221 of the reducer 220. The input shaft of the reducer 220 is connected to the output shaft of the motor 230. After the motor 230 starts, it inputs power to the reducer 220. The reducer 220 reduces and amplifies the torque before outputting the power to its output shaft 221, which then drives the swing arm shaft 340 to rotate via the chain 250. Existing harmonic reducers or planetary reducers can be directly selected as the reducer; any reducer capable of reducing and amplifying torque will suffice.

[0036] The braking device 400 includes a brake housing 410, a brake frame 420, an outer cover 430, and an electromagnet 440. The brake housing 410 is mounted on the housing 100, and the brake frame 420 is mounted on the brake housing 410 or the housing 100. An accumulator 540 is mounted on the brake frame 420 or the brake housing 410.

[0037] The swing arm shaft 340 passes through the brake frame 420 and the brake housing 410, and a brake sleeve 450 is installed on the portion of the swing arm shaft 340 located inside the brake frame 420. The brake sleeve 450 is pressed against the brake element 460 to achieve braking of the swing arm shaft 340. One end of the brake element 460 is hinged to the brake frame 420 through the brake pivot 461, and a connecting part 462 is installed on the other end. The connecting part 462 is hinged to the piston shaft 551 through the second pivot 472. The other end of the piston shaft 551 is inserted into the piston chamber 553 of the brake cylinder 550 and assembled with the piston 552. The piston 552 and the piston chamber 553 are sealed and slidably assembled. A first spring 610 is installed in the piston chamber 553 between the inner end face of the piston 552 and the rodless chamber. The first spring 610 applies a spring force to the piston 552 to push the piston shaft 551. A brake cylinder block 554 is provided on one end of the brake cylinder 550 away from the piston shaft 551. The brake cylinder block 554 is hinged to the brake frame 420 through another second rotating shaft 472.

[0038] The piston chamber 553 is connected to the outlet of the accumulator 540, which contains compressed gas or hydraulic oil. The accumulator 540 provides an initial pressure to the compressed gas or hydraulic oil to ensure that the air pressure and oil pressure reach the preset parameters. At the same time, this air pressure and oil pressure act on the piston 552 to provide greater resistance to the movement of the piston 552 towards the rodless chamber, thereby ensuring that the brake element 460 is pressed against the brake sleeve 450 to achieve braking in the braking state.

[0039] The connecting part 462 is hinged to the electromagnet shaft 561 via the first rotating shaft 471. The electromagnet shaft 561 is installed inside the electromagnet 560. After the electromagnet 560 is activated, it can drive the electromagnet shaft 561 to extend and retract axially. The outer shell of the electromagnet 560 is directly or indirectly hinged to the brake frame 410 or brake housing 420 via another first rotating shaft 471. The electromagnet 560 can be replaced by an electric cylinder, hydraulic cylinder, etc. Theoretically, as long as it can drive the electromagnet shaft 561 to extend axially, there are no special restrictions.

[0040] Preferably, there are two braking components 460. An electromagnet block 562 is provided on the outer shell of the electromagnet 560. The electromagnet block 562 is hinged to the connecting part 462 of the other braking component 460 through the first rotating shaft 471.

[0041] After the electromagnet 560 is activated, it drives the electromagnet shaft 561 to extend, thereby causing the two braking elements 460 to rotate away from the brake sleeve 450. This removes the pressure between the two braking elements 460 and the brake sleeve 450, allowing the brake sleeve 450 to rotate and releasing the brake. The electromagnet 560 is equipped with a self-locking function, meaning that its electromagnet shaft automatically locks after extending or retracting to its designated position, preventing further extension or retraction under external force and maintaining the position of the braking elements. Examples include bidirectional self-holding and power-off holding types.

[0042] Preferably, the connecting portion 462 is assembled or pressed with one end of the second spring 620, and the other end of the second spring 620 is assembled or pressed with the brake frame 420. The second spring 620 applies a spring force to the corresponding brake element 460 to press the brake sleeve 450, thereby increasing the braking force.

[0043] Preferably, an electromagnet 440 is also installed inside the brake housing 410, an electromagnetic shaft 520 is installed inside the electromagnet 440, and a coil 510 is fitted around the electromagnetic shaft 520. The coil 510 generates a magnetic field when energized. An electromagnetic base 480 is installed on the portion of the swing arm shaft 340 that passes through the electromagnet 440 and is located inside the electromagnet 440. A magnet block 481 is installed on the electromagnetic base 480. When braking is required, the coil 510 is energized to generate a magnetic field. This magnetic field creates resistance on the magnet block 481, causing the electromagnetic base 480 (swing arm shaft 340) to stop rotating quickly. At the same time, the electromagnet 560 is energized, causing the electromagnet shaft 561 to retract, causing the brake element to rotate towards the brake sleeve and press against the brake. After pressing, the coil is de-energized. Electromagnetic device 440 works in conjunction with magnet block 481 to achieve rapid braking using electromagnetic force. This method is mainly to improve the braking effect because the torque of the entire swing arm shaft is relatively large. Electromagnetic device is used to assist braking to stop its rotation or reduce its speed rapidly before the brake components and brake sleeves are pressed together to brake. This can effectively reduce the wear of brake components and brake sleeves, while increasing the braking effect and preventing the basket from shifting too much or even being submerged in water after braking.

[0044] Preferably, an encoder 530 is also installed on the swing arm shaft 340. The encoder 530 is used to detect the rotation angle of the swing arm shaft 340, thereby determining whether the basket is in a suspended state. Collision switches 210 are installed at corresponding locations on the housing 100 and the cold water tank 110 and hot water tank 120, respectively. When the swing arm 330 rotates to its maximum displacement point towards the cold water tank 110 or hot water tank 120, the swing arm 330 presses the collision switch 210, triggering the collision switch 210 to input a signal to the PLC or MCU, indicating that the rotation is complete and needs to be reversed. If the encoder 530 detects rotation during braking, it means that the braking force is insufficient. At this time, the administrator is prompted according to a preset program to adjust the braking force, such as replacing the second spring or replenishing the pressure of the accumulator.

[0045] Preferably, see Figures 3-4 One end of the output shaft of the motor 230 extends out of the motor and is assembled with the motor brake 240, which is mounted on the motor 230. During braking, the motor brake activates a pair of output shafts for braking. This braking effect is better, reducing the impact of braking at one end of the swing arm shaft on the output shaft. When the weight at the suspended platform is not large, effective braking and suspension can be achieved directly using the motor brake.

[0046] See Figure 14 This is a schematic diagram of the accumulator structure. The accumulator 540 includes an air nozzle 545, an air bladder 543, an energy storage piston 544, an energy storage chamber 542, and an energy storage shell 541. The energy storage chamber 542 is disposed inside the energy storage shell 541. The energy storage chamber 542 is sealed and slidably assembled with the energy storage piston 544. The energy storage piston 544 is pressed against the air bladder 543. The air bladder is hollow inside and communicates with the air nozzle 545. The energy storage chamber 542 is connected to the output pipe 546, and the output pipe 546 is connected to the piston chamber 543. The air bladder 543 is elastic. During use, pressurized gas is input into the air bladder 543 through the air nozzle 545. The air bladder expands, thereby generating a thrust on the energy storage piston 544, which pushes the energy storage piston 544 to move and squeeze the gas or hydraulic oil in the energy storage chamber 542 to increase the air pressure or hydraulic pressure. When the electromagnet drives the braking element to rotate away from the brake sleeve, it drives the piston shaft 551 to input some of the gas or hydraulic oil in the piston chamber into the energy storage chamber 542, thereby compressing the air bladder 541 and storing energy. When the electromagnet resets, this energy drives the gas or hydraulic oil into the piston chamber to restore the braking force between the braking element and the brake sleeve. This dynamic energy storage method is very suitable for the use of this application, and it has good braking effect and simple structure.

[0047] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0048] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A braking device for a temperature difference test chamber, characterized in that: The system includes a brake housing and a brake frame, with the brake frame mounted on the brake housing. A brake sleeve is installed on the portion of the brake arm shaft that passes through the brake frame and brake housing, and the brake sleeve is pressed against the brake element for braking. One end of the brake element is hinged to the brake frame via a brake pivot, and the other end is fitted with a connecting portion. The connecting portion is hinged to a piston shaft via a second pivot. The other end of the piston shaft is inserted into the piston chamber of the brake cylinder and assembled with the piston. The piston and piston chamber are sealed and slidably assembled. A first spring is installed in the piston chamber between the inner end faces of the piston and the rodless chamber. The outer shell of the brake cylinder is hinged to the brake frame or brake housing. The connecting part is hinged to the brake telescopic shaft via the first rotating shaft, and the brake telescopic shaft is installed in the brake actuator.

2. The braking device according to claim 1, characterized in that: A brake cylinder block is provided on the end of the brake cylinder away from the piston shaft, and the brake cylinder block is hinged to the brake frame through another second rotating shaft.

3. The braking device according to claim 1, characterized in that: An accumulator is installed on the brake frame or brake housing; the piston chamber is connected to the outlet of the accumulator, and the accumulator is filled with compressed gas or hydraulic oil.

4. The braking device according to claim 3, characterized in that: The accumulator includes an air nozzle, an air bladder, an energy storage piston, an energy storage chamber, and an energy storage shell. The energy storage shell contains an energy storage chamber, which is sealed and slidably assembled with the energy storage piston. The energy storage piston is pressed against the air bladder. The air bladder is hollow and connected to the air nozzle. The energy storage chamber is connected to the output pipe, and the output pipe is connected to the piston chamber. The air bladder is elastic.

5. The braking device according to claim 1, characterized in that: The braking components are two in number. An electromagnet block is provided on the outer shell of the electromagnet, and the electromagnet block is hinged to the connecting part of the other braking component through the first rotating shaft.

6. The braking device according to claim 1, characterized in that: The connecting part is assembled or pressed with one end of the second spring, and the other end of the second spring is assembled or pressed with the brake frame.

7. The braking device according to claim 1, characterized in that: An electromagnet is also installed inside the brake housing, and an electromagnetic shaft is installed inside the electromagnet. A coil is fitted around the electromagnetic shaft. An electromagnetic base is installed on the part of the swing arm shaft that passes through the electromagnet and is located inside the electromagnet. A magnet is installed on the electromagnetic base.

8. The braking device according to claim 1, characterized in that: An encoder is also installed on the swing arm shaft. The encoder is used to detect the rotation angle of the swing arm shaft. The encoder is installed inside the outer cover, which is installed on the brake housing.

9. A temperature difference test chamber, characterized in that, It includes the braking device according to any one of claims 1-8.

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