Heat dissipation pressure head test calibration device

Abstract

The utility model provides a heat dissipation pressure head test calibration device which comprises a shell, a control assembly and a plurality of groups of test assemblies, and the control assembly and the test assemblies are arranged in the shell. Each group of test assembly comprises a heat dissipation pressure head mounting block, a heating block, a lifting structure, a temperature sensing probe, a display screen and a temperature adjusting knob which are mutually independent; a plurality of test holes in one-to-one correspondence with the heating blocks are formed in the top of the shell, and the heat dissipation pressure head mounting blocks are detachably and correspondingly mounted at the test holes; the lifting structure is arranged in the shell, the heating block is arranged on the lifting structure, the lifting structure is used for driving the heating block to ascend and descend, and the heat dissipation pressing head can abut against the heating block when installed on the heat dissipation pressing head installation block; the temperature sensing probe is arranged on the heating block, and when the heat dissipation pressing head abuts against the heating block, the temperature sensing probe makes contact with the heat dissipation pressing head. The motor control panel, the temperature sensing probe, the heating block, the display screen and the temperature adjusting knob are electrically connected with the main control panel; and the lifting structure is electrically connected with the motor control panel.

Description

Technical Field

[0001] This utility model relates to the field of chip testing technology, and in particular to a heat dissipation pressure head testing and calibration device. Background Technology

[0002] When we talk about modern technology, chips have become an ubiquitous infrastructure. They are widely used in a wide variety of devices, from the simplest calculators to high-end supercomputers, and various handheld devices such as mobile phones and tablets. Although chips are small in size, they are powerful, thanks to the work of billions of tiny transistors inside them. However, these transistors generate a lot of heat during operation, and if this heat cannot be dissipated effectively, the chip will overheat, leading to performance degradation or even damage.

[0003] To prevent these problems, effective chip heat dissipation is necessary. The basic principle of heat dissipation is to increase the surface area of ​​the chip to improve heat dissipation efficiency. At the same time, by improving the thermal conductivity of the materials used in the heat dissipation device, heat can be more effectively transferred out of the chip.

[0004] As chip performance improves, traditional heat dissipation technologies are no longer sufficient. More advanced technologies, such as liquid cooling systems, are needed for better heat dissipation. Liquid cooling systems work by conducting heat to a liquid, which then dissipates the heat through circulation. This technology is highly efficient, but its manufacturing and maintenance costs are also higher. These factors undoubtedly increase costs in the design and fabrication of chip test sockets. Therefore, thermal simulation is typically used after design and before formal manufacturing to ensure that the heat dissipation effect of the designed structure more closely approximates real-world conditions.

[0005] However, an increasing number of customers are demanding information on the specific effectiveness of heat dissipation for chips, including both simulation data and actual test data, especially for high-cost chips. This is because poor heat dissipation can cause irreversible damage to expensive chips.

[0006] Therefore, there is a need to provide a heat dissipation pressure head testing and calibration device to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a heat dissipation pressure head testing and calibration device to test the heat dissipation effect of heat dissipation pressure heads used for chip heat dissipation.

[0008] This utility model provides a heat dissipation pressure head test calibration device, which includes a housing and a control component and multiple test components disposed in the housing. The control component includes a main control board and a motor control board. Each test component includes an independent heat dissipation pressure head mounting block, a heating block, a lifting structure, a temperature sensing probe, a display screen and a temperature adjustment knob.

[0009] The top of the outer shell is provided with a plurality of test holes corresponding one to one with the heating block. The heat dissipation pressure head mounting block for mounting the heat dissipation pressure head has an overall ring structure. The heat dissipation pressure head mounting block is detachably installed at the test holes respectively.

[0010] The lifting structure is disposed in the housing, the heating block is disposed on the lifting structure, the lifting structure is used to drive the heating block to rise and fall, the test hole allows the heating block to extend out from the test hole, so that the heat dissipation pressure head can abut against the heating block when it is installed on the heat dissipation pressure head mounting block;

[0011] The temperature sensing probe is disposed on the heating block. When the heat dissipation pressure head abuts against the heating block, the temperature sensing probe contacts the heat dissipation pressure head to measure the temperature of the heat dissipation pressure head.

[0012] The temperature sensing probe, the heating block, the display screen, and the temperature adjustment knob are electrically connected to the main control board; the motor control board is electrically connected to the main control board; and the lifting structure is electrically connected to the motor control board.

[0013] During testing, the heat dissipation head is installed on the heat dissipation head mounting block. The lifting structure drives the heating block to rise until it contacts the heat dissipation head. The temperature adjustment knob is adjusted to set the heating temperature of the heating block. The temperature sensing probe measures the actual temperature of the heat dissipation head and displays it on the display screen. The heat dissipation effect of the heat dissipation head is calibrated by comparing the heating temperature of the heating block with the actual temperature of the heat dissipation head measured by the temperature sensing probe.

[0014] Preferably, the test components are in three sets, and the three sets of test components are arranged sequentially along the length direction in the housing. The three sets of heat dissipation pressure head mounting blocks are of three different sizes, namely small heat dissipation pressure head mounting block, medium heat dissipation pressure head mounting block and large heat dissipation pressure head mounting block, which are used to match and install heat dissipation pressure heads of different sizes.

[0015] Preferably, the lifting structure includes a lifting motor, a motor screw, a lifting fastener, and a lifting movable component. The lifting fastener is fixed to the lifting motor, the lifting movable component is disposed above the lifting fastener, and the heating block is fixed to the top of the lifting movable component. The lifting motor is connected to the lifting movable component through the motor screw to drive the lifting movable component to move the heating block up and down.

[0016] Preferably, the lifting movable component is provided with fixed columns around its perimeter, the top of the fixed columns is fixedly connected to the heating block, the fixed columns are provided with guide grooves, the lifting fastener is provided with guide columns that match the guide grooves, and the lifting movable component moves up and down along the guide columns.

[0017] Preferably, the heating block is provided with a probe mounting hole, an insulating mounting post is provided in the probe mounting hole, the temperature sensing probe is located at the center of the insulating mounting post, and the insulating mounting post blocks the temperature sensing probe from the heating block.

[0018] Preferably, the system further includes a power adapter that supplies power to the control component and the test component; the power adapter is connected to an external power source via an external connector.

[0019] Preferably, the housing includes a front panel, a top cover, a left side panel, a right side panel, a back panel, and a bottom panel; the test hole is disposed on the top cover, the display screen and the temperature adjustment knob are disposed on the front panel, the main control board is disposed on the inner side of the left side panel, and the motor control board is disposed on the bottom panel.

[0020] Preferably, the control component further includes a power switch, an emergency stop button, a temperature reset button, and an indicator light; the temperature reset button and the indicator light are electrically connected to the main control board.

[0021] Preferably, it further includes a cooling fan and a temperature control module connected to the cooling fan, the temperature control module being connected to the main control board to control the start and stop of the cooling fan.

[0022] Preferably, the bottom of the outer casing is provided with foot pads.

[0023] Compared with the prior art, the technical solution of this utility model embodiment has at least the following beneficial effects:

[0024] This utility model provides a heat dissipation pressure head testing and calibration device, which is equipped with multiple sets of testing components. Each set of testing components includes an independent heat dissipation pressure head mounting block, a heating block, a lifting structure, a temperature sensing probe, a display screen, and a temperature adjustment knob. This allows for simultaneous and independent testing of multiple heat dissipation pressure heads, improving testing efficiency. The lifting structure drives the heating block to rise and fall, ensuring that the heat dissipation pressure head can come into contact with the heating block when mounted on it, guaranteeing tight contact. The temperature sensing probe is positioned on the heating block and, when the heat dissipation pressure head comes into contact with the heating block, measures its temperature. The heat dissipation effect of the pressure head is calibrated by comparing the heating temperature of the heating block with the actual temperature of the pressure head measured by the temperature sensing probe, resulting in accurate and reliable test results.

[0025] Furthermore, the heat dissipation head mounting block is detachable and comes in various sizes to match and install heat dissipation heads of different sizes, thus broadening its applicability.

[0026] Furthermore, a cooling fan is installed to effectively regulate the internal temperature of the device and ensure the normal operation of the testing work. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the heat dissipation pressure head test calibration device in the embodiment of this utility model;

[0028] Figure 2 This is a split diagram of the heat dissipation pressure head testing and calibration device in an embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the lifting structure and heating block in an embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the internal structure of the heat dissipation pressure head test calibration device in an embodiment of this utility model;

[0031] Figure 5 This is a cross-sectional view of the heat dissipation pressure head test calibration device in an embodiment of this utility model;

[0032] Figure 6 This is a longitudinal sectional view of the heat dissipation pressure head testing and calibration device in an embodiment of this utility model;

[0033] Figure 7 This is a schematic diagram of the heat dissipation pressure head testing and calibration device from another angle in an embodiment of this utility model;

[0034] Figure 8 This is a test schematic diagram of the heat dissipation pressure head test calibration device in an embodiment of this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 101-Top cover; 102-Front panel; 103-Right side panel; 104-Bottom plate; 105-Left side panel; 106-Back panel; 107-Small heat sink mounting block; 108-Medium heat sink mounting block; 109-Large heat sink mounting block; 110-Display screen; 111-Power switch; 112-Indicator light; 113-Temperature reset button; 114-Emergency stop button; 115-Temperature adjustment knob; 116-Foot pads;

[0037] 201-Heating block; 202-Lifting motor; 203-Lifting fastener; 204-Lifting moving part; 205-Insulating mounting post; 206-Temperature probe; 207-Motor screw;

[0038] 301-Main control board; 302-Power adapter; 303-Cooling fan; 304-Temperature control module; 305-Motor control board; 306-External connector;

[0039] 401-Cooling head. Detailed Implementation

[0040] To make the objectives, features, and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described below are merely for explaining this utility model and are not intended to limit it. Furthermore, the same or similar reference numerals may be used in the drawings to refer to the same or similar elements in different embodiments, and descriptions of the same or similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc., may be omitted.

[0041] The purpose of this invention is to provide a heat dissipation pressure head testing and calibration device to test the heat dissipation effect of heat dissipation pressure heads used for chip heat dissipation.

[0042] Figure 1 This is a schematic diagram of the structure of the heat dissipation pressure head test calibration device in the embodiment of this utility model; Figure 2 This is a split diagram of the heat dissipation pressure head testing and calibration device in an embodiment of this utility model; Figure 3 This is a schematic diagram of the lifting structure and heating block in an embodiment of this utility model; Figure 4 This is a schematic diagram of the internal structure of the heat dissipation pressure head test calibration device in an embodiment of this utility model; Figure 5 This is a cross-sectional view of the heat dissipation pressure head test calibration device in an embodiment of this utility model; Figure 6 This is a longitudinal sectional view of the heat dissipation pressure head testing and calibration device in an embodiment of this utility model; Figure 7 This is a schematic diagram of the heat dissipation pressure head testing and calibration device from another angle in an embodiment of this utility model; Figure 8 This is a test schematic diagram of the heat dissipation pressure head test calibration device in an embodiment of this utility model.

[0043] Now see Figures 1 to 8 The present invention provides a heat dissipation pressure head testing and calibration device, including a housing and a control component and multiple test components disposed in the housing. The control component includes a main control board 301 and a motor control board 305. Each test component includes an independent small heat dissipation pressure head mounting block 107, a medium heat dissipation pressure head mounting block 108 and a large heat dissipation pressure head mounting block 109, a heating block 201, a lifting structure, a temperature sensing probe 206, a display screen 110 and a temperature adjustment knob 115.

[0044] The top of the outer shell is provided with multiple test holes corresponding to the heating block 201. The small heat dissipation pressure head mounting block 107, medium heat dissipation pressure head mounting block 108 and large heat dissipation pressure head mounting block 109 used to install the heat dissipation pressure head 401 are in a ring structure. The small heat dissipation pressure head mounting block 107, medium heat dissipation pressure head mounting block 108 and large heat dissipation pressure head mounting block 109 can be detachably installed at the test holes respectively.

[0045] The lifting structure is set in the housing, and the heating block 201 is set on the lifting structure. The lifting structure is used to drive the heating block 201 to rise and fall. The test hole allows the heating block 201 to extend out from the test hole, so that the heat dissipation pressure head 401 can abut against the heating block 201 when it is installed on the small heat dissipation pressure head mounting block 107, the medium heat dissipation pressure head mounting block 108 or the large heat dissipation pressure head mounting block 109.

[0046] Temperature probe 206 is disposed on heating block 201. When heat dissipation head 401 abuts against heating block 201, temperature probe 206 contacts heat dissipation head 401 to measure the temperature of heat dissipation head 401.

[0047] Temperature probe 206, heating block 201, display screen 110 and temperature adjustment knob 115 are electrically connected to main control board 301; motor control board 305 is electrically connected to main control board 301; lifting structure is electrically connected to motor control board 305.

[0048] During testing, the heat dissipation head 401 is installed on a small heat dissipation head mounting block 107, a medium heat dissipation head mounting block 108, or a large heat dissipation head mounting block 109. The lifting structure drives the heating block 201 to rise until it contacts the heat dissipation head 401. The temperature adjustment knob 115 is adjusted to set the heating temperature of the heating block 201. The temperature sensing probe 206 measures the actual temperature of the heat dissipation head 401 and displays it on the display screen 110. The heat dissipation effect of the heat dissipation head 401 is calibrated by comparing the heating temperature of the heating block 201 with the actual temperature of the heat dissipation head 401 measured by the temperature sensing probe 206.

[0049] In some embodiments, the test components are in three groups, which are arranged sequentially along the length of the housing. The three test components include a small heat sink mounting block 107, a medium heat sink mounting block 108, and a large heat sink mounting block 109. The small heat sink mounting block 107, the medium heat sink mounting block 108, and the large heat sink mounting block 109 are three different types with different external dimensions, which are used to match and install heat sinks 401 of different sizes.

[0050] In some embodiments, the lifting structure includes a lifting motor 202, a motor screw 207, a lifting fastener 203, and a lifting movable component 204. The lifting fastener 203 is fixed to the lifting motor 202, the lifting movable component 204 is disposed above the lifting fastener 203, and the heating block 201 is fixed to the top of the lifting movable component 204. The lifting motor 202 is connected to the lifting movable component 204 through the motor screw 207 to drive the lifting movable component 204 to move the heating block 201 up and down.

[0051] In some embodiments, the lifting movable component 204 is provided with fixed columns around its perimeter, the top of the fixed columns is fixedly connected to the heating block 201, the fixed columns are provided with guide grooves, the lifting fastener 203 is provided with guide columns that match the guide grooves, the lifting movable component 204 moves up and down along the guide columns to ensure the smooth lifting and lowering of the heating block 201.

[0052] In some embodiments, the heating block 201 is provided with a probe mounting hole, and an insulating mounting post 205 is provided in the probe mounting hole. The temperature sensing probe 206 is located at the center of the insulating mounting post 205. The insulating mounting post 205 blocks the temperature sensing probe 206 from the heating block 201. The insulating mounting post 205 is made of insulating rubber. The insulating mounting post 205 is used to isolate the influence of the temperature of the heating block 201 on the temperature sensing probe 206, and at the same time, the temperature data of the contact position is measured.

[0053] In some embodiments, the housing includes a front panel 102, a top cover 101, a left side panel 105, a right side panel 103, a back panel 106, and a bottom plate 104; a test hole is provided on the top cover 101, a display screen 110 and a temperature adjustment knob 115 are provided on the front panel 102, and a motor control board 305 is provided on the bottom plate 104.

[0054] In some embodiments, a power adapter 302 is also included, which supplies power to the control components and the test components. The power adapter 302 is connected to an external power source via an external connector 306. The power adapter 302 is disposed on the base plate 104 near the right side plate 103, and the external connector 306 is disposed on the right side plate 103. The main control board 301 is disposed inside the left side plate 105 to be away from the power adapter 302 and to prevent damage caused by excessive heat.

[0055] In some embodiments, the control component further includes a power switch 111, an emergency stop button 114, a temperature reset button 113, and an indicator light 112. The power switch 111, emergency stop button 114, temperature reset button 113, and indicator light 112 are all located on the front panel 102. The temperature reset button 113 and indicator light 112 are electrically connected to the main control board 301. The temperature reset button 113 is used to return the device to its initial state after the test has stabilized and ended, without the need to adjust the temperature adjustment knob 113, preventing sudden temperature rise or data errors caused by reverse operation or misoperation. The emergency stop button 114 is used to shut off the device power supply in case of device failure or emergency caused by human factors, making it safer.

[0056] In some embodiments, the device further includes a cooling fan 303 and a temperature control module 304 connected to the cooling fan 303. The temperature control module 304 is connected to the main control board 301 to control the start and stop of the cooling fan 303. The cooling fan 303 is disposed on the back plate 106, the temperature control module 304 is disposed on the bottom plate 104, and the back plate 106 is provided with an air inlet corresponding to the cooling fan 303.

[0057] In some embodiments, the bottom of the housing is provided with feet 116, which helps to stabilize the device.

[0058] Please see Figure 8 In practice, the heat dissipation head 401 to be tested is fixed on a suitable small heat dissipation head mounting block 107, medium heat dissipation head mounting block 108, or large heat dissipation head mounting block 109; the external connector 306 is connected to the power supply, and the power switch 111 is pressed to start the equipment; at this time, the indicator light 112 shows green, and the temperature adjustment knob 115 is rotated. At this time, the lifting motor 202 moves upward, driving the heating block 201 to move upward and fit tightly with the heat dissipation head 401. The temperature adjustment knob 115 is rotated to the temperature value to be tested, and the display screen 110 displays the temperature rise curve and temperature data. After the equipment has stabilized for a period of time, the data is recorded to complete the test. The temperature reset button 113 is pressed to restore the equipment to its initial state.

[0059] In summary, the heat dissipation pressure head testing and calibration device provided by this utility model is equipped with multiple sets of testing components. Each set of testing components includes an independent small heat dissipation pressure head mounting block 107, a medium heat dissipation pressure head mounting block 108, and a large heat dissipation pressure head mounting block 109, a heating block 201, a lifting structure, a temperature sensing probe 206, a display screen 110, and a temperature adjustment knob 115. This allows for the simultaneous and independent testing of multiple heat dissipation pressure heads 401, improving testing efficiency. The lifting structure drives the heating block 201 to rise and fall, allowing the heat dissipation pressure head 401 to be mounted on the small heat dissipation pressure head mounting block 109. 07. When the medium-sized heat dissipation head mounting block 108 or the large heat dissipation head mounting block 109 is used, it can abut against the heating block 201 to ensure close contact between the heating block 201 and the heat dissipation head 401. The temperature sensing probe 206 is set on the heating block 201. When the heat dissipation head 401 abuts against the heating block 201, the temperature sensing probe 206 contacts the heat dissipation head 401 to measure the temperature of the heat dissipation head 401. The heat dissipation effect of the heat dissipation head 401 is calibrated by comparing the heating temperature of the heating block 201 with the actual temperature of the heat dissipation head 401 measured by the temperature sensing probe 206. The test results are accurate and reliable.

[0060] Furthermore, the small heat dissipation head mounting block 107, the medium heat dissipation head mounting block 108, and the large heat dissipation head mounting block 109 are detachable and can be installed. The small heat dissipation head mounting block 107, the medium heat dissipation head mounting block 108, and the large heat dissipation head mounting block 109 are of different sizes and are used to match and install heat dissipation heads 401 of different sizes, thus having a wider range of applications.

[0061] Furthermore, a cooling fan 303 is installed to effectively regulate the internal temperature of the device and ensure the normal operation of the testing work.

[0062] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this utility model disclosure, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this utility model disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claims as needed and where technically feasible, and may be derived from the technical features of the respective independent claims in any suitable manner rather than solely by the specific combinations listed in the claims.

[0063] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A heat dissipation pressure head testing and calibration device, characterized in that, It includes a housing and control components and multiple test components disposed within the housing. The control components include a main control board and a motor control board. Each set of test components includes an independent heat dissipation pressure head mounting block, a heating block, a lifting structure, a temperature sensing probe, a display screen, and a temperature adjustment knob. The top of the outer shell is provided with a plurality of test holes corresponding one to one with the heating block. The heat dissipation pressure head mounting block for mounting the heat dissipation pressure head has an overall ring structure. The heat dissipation pressure head mounting block is detachably installed at the test holes respectively. The lifting structure is disposed in the housing, the heating block is disposed on the lifting structure, the lifting structure is used to drive the heating block to rise and fall, the test hole allows the heating block to extend out from the test hole, so that the heat dissipation pressure head can abut against the heating block when it is installed on the heat dissipation pressure head mounting block; The temperature sensing probe is disposed on the heating block. When the heat dissipation pressure head abuts against the heating block, the temperature sensing probe contacts the heat dissipation pressure head to measure the temperature of the heat dissipation pressure head. The temperature sensing probe, the heating block, the display screen, and the temperature adjustment knob are electrically connected to the main control board; the motor control board is electrically connected to the main control board; and the lifting structure is electrically connected to the motor control board. The test components consist of three sets, which are arranged sequentially along the length of the housing. The three sets of heat dissipation pressure head mounting blocks are of three different sizes: small heat dissipation pressure head mounting block, medium heat dissipation pressure head mounting block, and large heat dissipation pressure head mounting block, which are used to match and install heat dissipation pressure heads of different sizes. During testing, the heat dissipation head is installed on the heat dissipation head mounting block. The lifting structure drives the heating block to rise until it contacts the heat dissipation head. The temperature adjustment knob is adjusted to set the heating temperature of the heating block. The temperature sensing probe measures the actual temperature of the heat dissipation head and displays it on the display screen. The heat dissipation effect of the heat dissipation head is calibrated by comparing the heating temperature of the heating block with the actual temperature of the heat dissipation head measured by the temperature sensing probe.

2. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, The lifting structure includes a lifting motor, a motor screw, a lifting fastener, and a lifting movable component. The lifting fastener is fixed to the lifting motor, the lifting movable component is disposed above the lifting fastener, and the heating block is fixed to the top of the lifting movable component. The lifting motor is connected to the lifting movable component through the motor screw to drive the lifting movable component to move the heating block up and down.

3. The heat dissipation pressure head testing and calibration device according to claim 2, characterized in that, The lifting movable component is provided with fixed columns around its perimeter. The top of the fixed columns is fixedly connected to the heating block. The fixed columns are provided with guide grooves. The lifting fastener is provided with guide columns that match the guide grooves. The lifting movable component moves up and down along the guide columns.

4. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, The heating block is provided with a probe mounting hole, and an insulating mounting post is provided in the probe mounting hole. The temperature sensing probe is located at the center of the insulating mounting post, and the insulating mounting post blocks the temperature sensing probe from the heating block.

5. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, It also includes a power adapter that supplies power to the control component and the test component; the power adapter is connected to an external power source via an external connector.

6. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, The housing includes a front panel, a top cover, a left side panel, a right side panel, a back panel, and a bottom panel; the test hole is located on the top cover, the display screen and the temperature adjustment knob are located on the front panel, the main control board is located inside the left side panel, and the motor control board is located on the bottom panel.

7. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, The control component also includes a power switch, an emergency stop button, a temperature reset button, and an indicator light; the temperature reset button and the indicator light are electrically connected to the main control board.

8. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, It also includes a cooling fan and a temperature control module connected to the cooling fan, the temperature control module being connected to the main control board to control the start and stop of the cooling fan.

9. The heat dissipation pressure head testing and calibration device according to claim 1, characterized in that, The bottom of the outer casing is provided with foot pads.

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