A test stand

Abstract

The application relates to a test support, which comprises a supporting part and a liquid cooling mechanism; the supporting part is internally provided with a cooling flow channel, and the supporting part is further provided with a supporting surface; the liquid cooling mechanism is provided with a liquid cooling box for storing cooling liquid, and the liquid cooling box is communicated with the cooling flow channel through a pipeline and forms a cooling loop. When the test support is used for performance test of a component to be tested, the component to be tested can be effectively cooled, and the accuracy of the performance test result of the component to be tested and the test efficiency are ensured.

Description

Technical Field

[0001] This application relates to the field of testing tooling technology, specifically to a testing bracket. Background Technology

[0002] Vehicle control components and electrical components require testing during the R&D and subsequent production stages. For example, vehicle-mounted main units require wireless radio frequency testing. Due to the relatively long testing time, the chips generate a lot of heat during the testing process, and prolonged operation can lead to temperature rise and performance degradation. Existing vehicle-mounted main units mainly rely on fans to cool them down during testing, which has poor heat dissipation. During long-term continuous testing, the vehicle-mounted main unit needs to be shut down for a period of time to cool down before testing can continue, resulting in low testing efficiency and potentially affecting the accuracy of the tests.

[0003] Therefore, improving heat dissipation and ensuring the accuracy and efficiency of performance test results are technical problems that urgently need to be solved by those skilled in the art during the performance testing of components such as vehicle-mounted main units. Utility Model Content

[0004] The purpose of this application is to provide a test bracket that can effectively cool down the component under test during performance testing, thereby ensuring the accuracy of the test results and the efficiency of the test.

[0005] To address the aforementioned technical problems, this application provides a test bracket, including a support portion and a liquid cooling mechanism; the support portion is provided with a cooling channel and a support surface; the liquid cooling mechanism is provided with a liquid cooling tank for storing coolant, and the liquid cooling tank is connected to the cooling channel through a pipeline to form a cooling circuit.

[0006] Optionally, the liquid cooling mechanism further includes a cooling section and a liquid pump, wherein the cooling section is used to cool the coolant in the liquid cooling tank, and the liquid pump is used to provide power to the liquid in the cooling circuit.

[0007] Optionally, it also includes a base, the base having a mounting cavity, the liquid cooling mechanism being located within the mounting cavity, and the support being positioned above the base.

[0008] Optionally, the bottom of the base may also be provided with fixing bolts or suction cups.

[0009] Optionally, the suction cup portion includes a main suction cup, which is detachably connected to the base.

[0010] Optionally, the base is further provided with a bottom plate, the bottom plate having a locking hole or a locking groove, and the main suction cup is locked into the locking hole or locking groove.

[0011] Optionally, the suction cup portion includes a plurality of auxiliary suction cups, which are spaced apart circumferentially along the base plate.

[0012] Optionally, it also includes a support frame, which is disposed between the base and the support portion, and a pivot is connected between the support portion and the support frame, and the support portion is rotatable relative to the support frame about the pivot.

[0013] Optionally, the support portion is further provided with a stop, which is located at the bottom edge of the support surface and extends out of the support surface. The stop is used to block the component to be tested placed on the support surface from the bottom.

[0014] Optionally, the support frame includes a first section and a second section that are nested together. The first section is connected to the base, and the second section is connected to the support portion. The first section and the second section are movable relative to each other in the height direction.

[0015] Optionally, it also includes a driving element connected to at least one of the first segment and the second segment, and used to drive the first segment and the second segment to move relative to each other.

[0016] Optionally, the driving component includes a motor, a lead screw, and a nut, wherein the motor is drivenly connected to the lead screw, and the nut is threadedly engaged with the lead screw; the motor is connected to the first segment, and the nut is connected to the second segment; or, the motor is connected to the second segment, and the nut is connected to the first segment.

[0017] Optionally, the motor is located inside the base, and the lead screw is arranged along the height direction and passes through the first section and connects to the second section.

[0018] The test bracket provided in this application has the following technical advantages compared to the prior art:

[0019] The support section provides support for the component to be tested through the support surface. The liquid cooling mechanism is equipped with a liquid cooling tank for storing coolant. The liquid cooling tank is connected to the cooling channel through a pipeline. There are two pipelines, which are respectively connected to the two ends of the cooling channel. The liquid cooling tank, one pipeline, the cooling channel, and the other pipeline are connected in sequence to form a cooling circuit. The coolant in the liquid cooling tank can circulate through the support section through the cooling circuit.

[0020] During the test, the component under test is placed on the support surface of the support unit and tested. The coolant in the liquid cooling box can enter the cooling channel in the support unit through the pipeline. When the coolant flowing in the cooling circuit passes through the cooling channel, it can exchange heat with the component under test that is in contact with the support surface, so as to remove the heat generated by the component under test during the test, thereby achieving effective cooling of the component under test, ensuring the performance stability of the component under test, and thus ensuring the accuracy of the test results. At the same time, it can also conduct continuous testing for a long time without stopping for cooling, thus ensuring the testing efficiency of the component under test. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the test bracket provided in the embodiments of this application;

[0022] Figure 2 This is a structural schematic diagram of the test support from another perspective;

[0023] Figure 3 This is a schematic diagram of the internal structure of the support section;

[0024] Figure 4 This is a schematic diagram of the internal structure of the base;

[0025] Figure 5 This is a schematic diagram of the bottom structure of the test bracket.

[0026] Appendix Figures 1-5 The reference numerals in the attached figures are explained as follows:

[0027] 1 Support section, 11 Cooling channel, 12 Support surface, 13 Baffle;

[0028] 2. Liquid cooling mechanism; 21. Liquid cooling box; 22. Cooling section; 23. Liquid pump;

[0029] 3. Piping;

[0030] 4 bases, 41 mounting cavities;

[0031] 5. Support frame, 51. First section, 52. Second section;

[0032] 6-axis rotation;

[0033] 7. Suction cup section, 71. Main suction cup, 711. Adsorption section, 712. Fixing section, 713. Annular protrusion, 72. Auxiliary suction cup

[0034] 8 base plates, 81 card holes, 82 grooves;

[0035] 9 drive components, 91 motor, 92 lead screw;

[0036] 10 reinforcing ribs. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Vehicle control components and electrical components require testing during the R&D and subsequent production stages. For example, vehicle-mounted main units require wireless radio frequency testing. Due to the relatively long testing time, the chips generate a lot of heat during the testing process, and prolonged operation can lead to temperature rise and performance degradation. Existing vehicle-mounted main units mainly rely on fans to cool them down during testing, which has poor heat dissipation. During long-term continuous testing, the vehicle-mounted main unit needs to be shut down for a period of time to cool down before testing can continue, resulting in low testing efficiency and potentially affecting the accuracy of the tests.

[0039] This application provides a test bracket. During the testing of a vehicle-mounted host or other components, the component to be tested can be placed on the test bracket. The test bracket can effectively cool the component to be tested to ensure testing efficiency.

[0040] refer to Figures 1-4 The test bracket includes a support part 1 and a liquid cooling mechanism 2. The support part 1 is provided with a cooling channel 11 and a support surface 12. The support part 1 provides support for the component to be tested through the support surface 12. The liquid cooling mechanism 2 is provided with a liquid cooling tank 21 for storing coolant. The liquid cooling tank 21 is connected to the cooling channel 11 through a pipe 3. There are two pipes 3, which are respectively connected to the two ends of the cooling channel 11. The liquid cooling tank 21, one pipe 3, the cooling channel 11, and the other pipe 3 are connected in sequence to form a cooling circuit. The coolant in the liquid cooling tank 21 can circulate through the support part 1 through the cooling circuit.

[0041] During the test, the component under test is placed on the support surface 12 of the support part 1 and tested. The coolant in the liquid cooling box 21 can enter the cooling channel 11 in the support part 1 along the pipe 3. When the coolant flowing in the cooling circuit flows through the cooling channel 11, it can exchange heat with the component under test that is in contact with the support surface 12, so as to remove the heat generated by the component under test during the test, thereby achieving effective cooling of the component under test, ensuring the performance stability of the component under test, and thus ensuring the accuracy of the test results. At the same time, it can also be tested continuously for a long time without stopping for cooling, thus ensuring the testing efficiency of the component under test.

[0042] like Figure 4As shown, the liquid cooling mechanism 2 also includes a cooling section 22 and a liquid pump 23. The cooling section 22 is used to cool the coolant in the liquid cooling tank 21. Of course, in this embodiment, the liquid cooling mechanism 2 may not have a cooling section 22. The coolant can be naturally cooled in the liquid cooling tank 21. The setting of the cooling section 22 can improve the cooling efficiency of the coolant, ensure that the temperature of the coolant in the cooling circuit meets the requirements, and thus ensure the heat exchange effect between the coolant and the component under test.

[0043] The liquid pump 23 is used to provide power to the liquid in the cooling circuit to ensure the flow of coolant in the cooling circuit. Specifically, the flow rate of coolant in the cooling circuit can be adjusted by the liquid pump 23 according to the heat generation of the component under test.

[0044] like Figure 1 , Figure 2 and Figure 4 As shown, the test bracket also includes a base 4, which has an installation cavity 41. The liquid cooling mechanism 2 is located in the installation cavity 41, and the support part 1 is located above the base 4. The base 4 can provide protection for the liquid cooling mechanism 2 and make the overall structure of the test bracket more regular, which is convenient for movement and fixing.

[0045] In this embodiment, there is no limitation on the specific structure of the base 4. For example, the base 4 can be configured as a structure including a box body and a box cover. The top wall or side wall of the box body is provided with an opening, and the box cover can close the opening and enclose the box body to form an installation cavity 41.

[0046] The bottom of the base 4 is also equipped with a fixing component, which can be a fixing bolt or a suction cup 7. The fixing component can fix the base 4 in a suitable position, such as a test platform or the ground, to ensure the stability of the test bracket during the test of the component under test, and to avoid problems such as disconnection of the circuit connection of the component under test or interference with other components due to positional movement of the test bracket.

[0047] When the fixing component is a fixing bolt, the base 4 can be provided with fixing holes through which the fixing bolt passes, or the fixing bolt can also be fixedly installed with the base 4. When the fixing component is a suction cup part 7, the suction cup part 7 can include at least one suction cup, which can be used to adhere and fix the component to the test platform or the ground. Of course, in this embodiment, the specific structure of the fixing component is not limited. For example, the fixing component can also be set as a clamping component, a snap-fit ​​component, etc. Setting the fixing component as a fixing bolt or a suction cup part 7 can simplify the overall structure and facilitate the fixing operation while ensuring the fixing stability.

[0048] like Figure 2 and Figure 5As shown, the fixing component is a suction cup part 7, which includes a main suction cup 71. The main suction cup 71 is detachably connected to the base 4. After long-term use, the main suction cup 71 may become unable to effectively and stably achieve fixation through adsorption due to aging and other problems. In this case, the main suction cup 71 can be replaced to ensure the stability of fixation.

[0049] like Figure 2 and Figure 5 As shown, the base 4 also has a base plate 8 at its bottom, with a locking hole 81 or a locking groove. The suction cup part 7 includes a main suction cup 71, which is snapped into the locking hole 81, achieving a detachable connection through the snapping action. Figure 5 As shown, the inner wall of the card hole 81 is provided with a groove 82 along the circumference. The main suction cup 71 includes an adsorption part 711 and a fixing part 712. The adsorption part 711 has an adsorption surface and is fixed to a suitable position by adsorption. The fixing part 712 is located on the side of the adsorption part 711 away from the adsorption surface. The fixing part 712 has an annular protrusion 713 along the circumference. During installation, the fixing part 712 is inserted into the card hole 81 or the card slot, and the annular protrusion 713 is engaged in the groove 82, thus realizing the installation between the main suction cup 71 and the base 4. The fixing part 712 and the adsorption part 711 are an integral structure, made of the same material, and both have a certain degree of flexibility. Therefore, during the installation and disassembly of the fixing part 712, the annular protrusion 713 will undergo slight deformation to achieve engagement or disengagement with the groove 82, making the installation operation relatively convenient.

[0050] Of course, in this embodiment, there are no restrictions on the fixing method between the main suction cup 71 and the base 4. For example, they can also be fixed together by fasteners arranged along the circumference, or by clamping with other clamping parts. The snap-fit ​​method for detachable connection makes the overall structure simpler and the disassembly and assembly operations more convenient.

[0051] like Figure 2 , Figure 4 and Figure 5 As shown, the base plate 8 is a structure independent of the base 4. The base 4 includes a box body. The base plate 8 is fixed to the bottom of the base 4. Specifically, it can be fixed by fasteners, welding, etc. Alternatively, the bottom plate of the base 4 (i.e., the plate on the bottom wall side of the box body) can also be used as the base plate 8.

[0052] like Figure 5As shown, the suction cup section 7 also includes multiple auxiliary suction cups 72, which are spaced apart circumferentially along the base plate 8. The main suction cup 71 is approximately located in the center of the base plate 8, and the auxiliary suction cups 72 are positioned circumferentially around the main suction cup 71. The arrangement of multiple auxiliary suction cups 72 ensures the adsorption stability of the suction cup section 7 circumferentially, preventing tilting. The number of auxiliary suction cups 72 is not limited; it can be four, six, eight, or other types. The auxiliary suction cups 72 can be fixedly connected to the base plate 8 or detachably connected.

[0053] Furthermore, in this embodiment, the number of main suction cups 71 is not limited, and can be as follows: Figure 5 The auxiliary suction cup 72 shown can be one, two or more, or in this embodiment, the auxiliary suction cup 72 can be omitted, and the fixation can be achieved by multiple main suction cups 71 arranged at intervals along the circumference of the base plate 8, and each main suction cup 71 can be detachably connected to the base plate 8.

[0054] In this embodiment, the bottom of the base 4 may not have a fixing component. Instead, multiple casters can be spaced circumferentially around the bottom of the base 4 to facilitate moving the test bracket to a suitable position. The casters can also be equipped with brakes to ensure the stability of the test bracket. The fixing component, on the other hand, improves the stability of the test bracket during testing.

[0055] like Figure 1 and Figure 2 As shown, the test bracket also includes a support frame 5, which is disposed between the base 4 and the support part 1. The support frame 5 provides support for the support part 1. The support part 1 and the support frame 5 are connected by a pivot 6, and the support part 1 can rotate relative to the support frame 5 around the pivot 6. The axis of the pivot 6 can be perpendicular to the height direction or arranged at other angles. By rotating the support part 1 relative to the support frame 5 around the pivot 6, the tilt angle of the support surface 12 of the support part 1 can be adjusted, facilitating the operator's testing operations.

[0056] like Figure 1 As shown, the support part 1 is also provided with a stop 13, which is located at the bottom edge of the support surface 12 and extends out of the support surface 12. When the component to be tested is placed on the support surface 12, for ease of operation, the support surface 12 may be tilted towards the operator. In this case, the stop 13 can provide support for the component to be tested from the bottom, preventing the component to be tested from slipping along the support surface 12 and ensuring the stability of the component to be tested. The structure of the stop 13 is not limited, such as... Figure 1As shown, the baffle 13 can be a baffle structure continuously arranged along the bottom edge of the support surface 12, or multiple baffles 13 can be arranged sequentially and spaced apart along the bottom edge of the support surface 12. Taking the baffle as an example, the upper surface of the baffle can be a planar structure or an inclined surface. For example, the height of the side facing the support surface 12 should be lower than the height of the side away from the support surface 12. Alternatively, the upper surface of the baffle can be provided with a support groove structure to ensure the stability of the test component when it is placed on the support surface 12.

[0057] The support frame 5 can extend and retract along the height direction. This design makes it easy to adjust the height of the support part 1, thereby facilitating the operator to perform testing operations on the part to be tested.

[0058] Of course, in this embodiment, the support frame 5 can also be configured as a structure with a slide rail, and the support part 1 is provided with a slider. The slider can slide along the slide rail to realize the position adjustment of the support part 1 in the height direction. The support frame 5 can be configured as a structure that can extend and retract in the height direction, which facilitates the adjustment of the position of the support part 1 while ensuring the stability of the adjustment.

[0059] like Figure 1 and Figure 2 As shown, the support frame 5 includes a first segment 51 and a second segment 52 arranged along its length. The first segment 51 is connected to the base 4, and a reinforcing rib 10 can be connected between the first segment 51 and the base 4 to ensure the stability of the overall structure. The second segment 52 is connected to the support part 1. The first segment 51 and the second segment 52 are nested together, and the first segment 51 and the second segment 52 can move relative to each other along the height direction. Specifically, the first segment 51 can have a cavity, and the bottom of the second segment 52 is located in the cavity. The relative movement of the two can adjust the length of the second segment 52 extending into the cavity. Alternatively, the second segment 52 can have a cavity, and the top of the first segment 51 can be located in the cavity. Of course, in this embodiment, the support frame 5 can also be configured as a multi-segment structure that nests together. However, when it is configured as a two-segment structure including the first segment 51 and the second segment 52, the overall structure can be simplified while meeting the adjustment requirements.

[0060] The first segment 51 and the second segment 52 are interlocked and can also guide the relative movement between the two, ensuring the stability of their cooperation, and thus ensuring the stability of the position adjustment of the support part 1 along the height direction.

[0061] Alternatively, in this embodiment, one of the first segment 51 and the second segment 52 may be provided with a slide rail, and the other may be provided with a slider that can slide along the slide rail. When the first segment 51 and the second segment 52 are set as an interlocking structure, the overall structure can be simplified and can be achieved with just two pipe fittings, effectively reducing costs.

[0062] The test bracket also includes a drive component 9, which is connected to at least one of the first segment 51 and the second segment 52 and is used to drive the first segment 51 and the second segment 52 to move relative to each other. Of course, in this embodiment, the drive component 9 may not be provided. When adjusting the height position of the support part 1 through the support frame 5, it can be adjusted manually by the operator. The provision of the drive component 9 can save time and effort and improve the degree of mechanization.

[0063] In this embodiment, the specific structure of the driving component 9 is not limited, such as... Figure 4 As shown, the driving component 9 includes a motor 91, a lead screw 92, and a nut (not shown in the figure). The lead screw 91 is arranged axially along the height direction. The motor 91 is connected to the lead screw 92 in a transmission manner. The nut is threadedly engaged with the lead screw 92. When the motor 91 drives the lead screw 92 to rotate, the nut does not rotate with the lead screw 92, but the nut can move axially along the lead screw 92.

[0064] The motor 91 is connected to the first section 51, and the nut is connected to the second section 52. When the motor 91 drives the lead screw 92 to rotate, the nut can drive the second section 52 to move along the circumference of the lead screw 92, thereby realizing the relative movement between the first section 51 and the second section 52 in the height direction, that is, the extension and retraction of the support frame 5.

[0065] Motor 91 and the first segment 51 can be directly connected or indirectly connected, such as... Figure 4 As shown, the motor 91 is installed in the mounting cavity 41 of the base 4. The lead screw 92 passes through the first section 51 and is threadedly engaged with the nut connected to the second section 52. At this time, the motor 91 is indirectly connected to the first section 51 through the base 4. Alternatively, in this embodiment, the motor 91 can also be directly connected to the first section 51. When the motor 91 is installed in the mounting cavity 41 of the base 4, the base 4 can provide protection for the motor 91 and make the overall structure more regular, which is convenient for handling and moving operations.

[0066] Of course, in this embodiment, the motor 91 can be connected to the second segment 52, and the nut can be connected to the first segment 51. The motor 91 drives the lead screw 92 to rotate, and the nut can drive the first segment 51 and the second segment 52 to move relative to each other.

[0067] Alternatively, in this embodiment, the driving component 9 can be configured as a driving cylinder (such as a pneumatic cylinder or a hydraulic cylinder). For example, the cylinder body of the driving cylinder can be connected to the first segment 51, and the piston rod of the driving cylinder can be connected to the second segment 52. The driving cylinder can be specifically set in the mounting cavity 41 of the base 4. Alternatively, the support frame 5 can be directly configured as a driving cylinder, with the cylinder body fixed to the base 4 and the piston rod fixed to the support part 1. The piston rod extends and retracts along the height direction, and the extension and retraction of the support frame 5 is achieved through the extension and retraction of the piston rod.

[0068] The support frame 5 is configured to include a first section 51 and a second section 52. The drive component 9, consisting of a motor 91, a lead screw 92, and a nut, drives the lead screw 92 to rotate. This allows the first section 51 and the second section 52 to self-lock at any position when the support frame 5 is extended or retracted. Furthermore, the height of the support frame 5 can be adjusted by driving the lead screw 92 to rotate, ensuring position adjustment accuracy and improving operability.

[0069] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0071] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A test stand, characterized in that, It includes a support part (1) and a liquid cooling mechanism (2); The support part (1) is provided with a cooling channel (11), and the support part (1) is also provided with a support surface (12). The liquid cooling mechanism (2) is provided with a liquid cooling tank (21) for storing coolant. The liquid cooling tank (21) is connected to the cooling channel (11) through a pipe (3) to form a cooling circuit.

2. The test bracket according to claim 1, characterized in that, The liquid cooling mechanism (2) further includes a cooling section (22) and a liquid pump (23). The cooling section (22) is used to cool the coolant in the liquid cooling tank (21), and the liquid pump (23) is used to provide power to the liquid in the cooling circuit.

3. The test bracket according to claim 1, characterized in that, It also includes a base (4), which has an installation cavity (41) inside. The liquid cooling mechanism (2) is located inside the installation cavity (41), and the support part (1) is located above the base (4).

4. The test bracket according to claim 3, characterized in that, The bottom of the base (4) is also provided with fixing bolts or suction cups (7).

5. The test bracket according to claim 4, characterized in that, The suction cup part (7) includes a main suction cup (71), which is detachably connected to the base (4).

6. The test bracket according to claim 5, characterized in that, The base (4) is also provided with a base plate (8) at the bottom, and the base plate (8) is provided with a card hole (81) or a card slot, and the main suction cup (71) is engaged in the card hole (81) or card slot.

7. The test bracket according to claim 6, characterized in that, The suction cup section (7) includes a plurality of auxiliary suction cups (72), which are spaced apart circumferentially along the base plate (8).

8. The test bracket according to any one of claims 3-7, characterized in that, It also includes a support frame (5), which is located between the base (4) and the support part (1). A pivot (6) is connected between the support part (1) and the support frame (5), and the support part (1) can rotate relative to the support frame (5) around the pivot (6).

9. The test bracket according to claim 8, characterized in that, The support part (1) is also provided with a stop (13), which is located at the bottom edge of the support surface (12) and extends out of the support surface (12). The stop (13) is used to block the test component placed on the support surface (12) from the bottom.

10. The test bracket according to claim 8, characterized in that, The support frame (5) includes a first section (51) and a second section (52) that are nested together. The first section (51) is connected to the base (4), and the second section (52) is connected to the support part (1). The first section (51) and the second section (52) can move relative to each other in the height direction.

11. The test bracket according to claim 10, characterized in that, It also includes a drive unit (9) connected to at least one of the first segment (51) and the second segment (52) and used to drive the first segment (51) and the second segment (52) to move relative to each other.

12. The test bracket according to claim 11, characterized in that, The driving component (9) includes a motor (91), a lead screw (92) and a nut. The motor (91) is connected to the lead screw (92) in a transmission connection, and the nut is threadedly engaged with the lead screw (92). The motor (91) is connected to the first segment (51), and the nut is connected to the second segment (52); or, the motor (91) is connected to the second segment (52), and the nut is connected to the first segment (51).

13. The test bracket according to claim 12, characterized in that, The motor (91) is located inside the base (4), and the lead screw (92) is arranged along the height direction and passes through the first section (51) and connects to the second section (52).

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