A distribution box suitable for installation on a shaped wall surface

Abstract

The application provides a distribution box suitable for installation on a special-shaped wall surface, and relates to the technical field of distribution boxes.The distribution box comprises a mounting plate and a distribution box fixed to the back of the mounting plate.Four telescopic rods are vertically installed in a rectangular array on the end face of the mounting plate close to the wall surface.The telescopic rods comprise telescopic arms fixed to the end face of the mounting plate, elongated rods movably arranged in the telescopic channels at the end of the telescopic arms, pre-tightening assemblies and positioning assemblies arranged on the telescopic arms, and adjusting assemblies arranged on the telescopic arms and sequentially controlling the pre-tightening assemblies and the positioning assemblies to work.When the adjusting assemblies move along the axial direction of the telescopic arms, the pre-tightening assemblies and the positioning assemblies are sequentially driven to act, the pre-tightening blocks are pressed against the outer wall of the elongated rods to realize pre-tightening with a first pre-tightening force, and after the adjustment of the mounting plate is completed, the adjusting assemblies control the end of the positioning rods to lock the elongated rods.The application effectively improves the convenience and locking reliability of the installation and adjustment of the distribution box on the special-shaped wall surface.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, specifically to a distribution box adapted for installation on irregularly shaped walls. Background Technology

[0002] As core equipment for power distribution and control, distribution boxes are widely used in various building locations. During the installation of distribution boxes, wall flatness is one of the key factors affecting installation quality. However, in actual projects, building walls often have varying degrees of unevenness, tilting, and other defects, especially in scenarios such as renovation of old buildings, unfinished walls, irregularly shaped walls, and complex outdoor terrain. In these situations, the wall flatness may not meet the requirements for direct installation of distribution boxes, posing significant challenges to their fixed installation.

[0003] Currently, the following technical methods are mainly used for installing electrical distribution boxes on uneven walls or irregular surfaces:

[0004] One method involves filling the space between the distribution box and the wall with shims or supports, and then manually leveling the box to adjust its horizontal and vertical alignment. This method is cumbersome, inaccurate, and the shims are prone to loosening and falling off over time, affecting the reliability of the distribution box installation.

[0005] Secondly, a distribution box with multi-directional adjustment function is adopted. For example, Chinese patent CN2136539Y discloses a multi-directional adjustable distribution box, which is mainly composed of a base shell, a panel, an electrical mounting plate, a bracket, and an adjustment frame. The panel position is adjustable in five directions: tilt, in / out, up / down, and can solve problems such as panel tilt and uneven wall surfaces. However, this solution achieves adjustment through guide seats, adjustment frames, hinges, and other structures, which is relatively complex. The adjustment components are scattered, making operation inconvenient, and there is a lack of reliable pre-tightening and positioning mechanisms after adjustment.

[0006] Thirdly, an adjustable telescopic support structure is used. For example, Chinese patent CN209805340U discloses an electrical installation engineering box pre-embedded fixing device, including a central body, with support components on each side of the central body. Each support component includes a support plate and two sets of telescopic support rods. The angle of the support plate is adjusted by adjusting the length of each set of telescopic support rods. Another example is Chinese patent CN210898012U, which discloses an adjustable distribution cabinet support frame adapted to irregularly shaped mountains. The inner wall of the support column is threadedly connected to the outer wall of the inner support rod. The extension length is adjusted by rotating the inner support rod to adapt to the uneven surface of the irregularly shaped mountain.

[0007] However, the aforementioned existing technologies still have the following shortcomings:

[0008] First, most existing telescopic adjustment structures use a single locking method, meaning the telescopic rod is locked directly after adjustment. During adjustment, the telescopic rod lacks effective pre-tightening and temporary fixing methods. Operators need to support the mounting plate to maintain posture while performing the locking operation, which is not only inconvenient but also makes precise adjustment difficult.

[0009] Second, existing locking methods mostly rely on friction (such as locking sleeves or bolts). This friction locking method is prone to weakening due to factors such as vibration and temperature changes during long-term use, which may lead to loosening and cannot provide reliable mechanical positioning.

[0010] Third, existing telescopic rods are mostly adjusted as a whole or at a single point, making it difficult to achieve multi-point independent and graded controllable adjustment. There is a lack of independent pre-tightening force adjustment mechanisms between each telescopic rod, making it impossible to perform precise adjustments based on the unevenness of different locations on the wall.

[0011] Fourth, the existing telescopic pole structure has a single function, only undertaking the function of length adjustment. The final fixing of the mounting plate to the wall still requires the drilling of expansion bolt holes on the mounting plate, which increases the structural complexity and installation steps.

[0012] To address the aforementioned technical issues, this application provides a distribution box adapted for installation on irregularly shaped walls. By setting an adjustment component to sequentially drive the pre-tightening component and the positioning component to work together, a two-stage locking mechanism of "pre-tightening-positioning" is achieved for the telescopic rod, providing reliable mechanical positioning and locking while ensuring adjustment flexibility. Summary of the Invention

[0013] To address the above problems, the present invention provides a distribution box that is adapted for installation on irregularly shaped walls.

[0014] To achieve the above objectives, the present invention provides the following technical solution: a distribution box adapted for installation on irregularly shaped walls, comprising a mounting plate and a distribution box fixed to the back of the mounting plate. Four telescopic rods are vertically mounted in a rectangular array on one end face of the mounting plate near the wall. Each telescopic rod includes a telescopic arm fixedly mounted on the end face of the mounting plate, an extension rod that is movably inserted through a telescopic channel at one end of the telescopic arm, a pre-tightening component and a positioning component mounted on the telescopic arm, and an adjustment component mounted on the telescopic arm that sequentially controls the operation of the pre-tightening component and the positioning component. The outer wall of the telescopic arm is provided with pre-tightening holes and positioning holes that communicate with the interior of the telescopic channel in a direction away from the mounting plate. The extension rod is a hollow tubular structure with an inner cavity forming an installation channel for expansion bolts to pass through. After passing through the inner cavity of the extension rod, the expansion bolts pass through the installation holes on the wall. The mounting plate is provided with openings that communicate with the telescopic channel and the installation channel.

[0015] The pretensioning assembly includes a pretensioning block that slides through the pretensioning hole near the opening of the extension rod, and an elastic element that is disposed in the pretensioning hole and connected to the pretensioning block. The elastic element is in a normal state.

[0016] The positioning assembly includes a positioning rod that slides through the positioning hole near the opening of one end of the extension rod, and a positioning element that is disposed in the positioning hole and connected to the positioning rod.

[0017] When the adjusting component moves along the axial direction of the telescopic arm, it sequentially drives the pre-tightening component and the positioning component to move, so that the pre-tightening block presses the outer wall of the extension rod with the first pre-tightening force to achieve pre-tightening. After the mounting plate is adjusted, the adjusting component is controlled to lock the end of the positioning rod of the extension rod.

[0018] Preferably, the adjustment assembly includes an adjustment ring sleeved on the outside of the telescopic arm and threadedly connected to the telescopic arm body, and a push ring disposed on the end of the adjustment ring near the wall.

[0019] Preferably, the pre-tightening assembly further includes a push block slidably disposed in the pre-tightening hole. The push block is located at an opening position in the pre-tightening hole away from the end of the extension rod, and the end of the push block protrudes out of the pre-tightening hole. The protruding end of the push block is provided with a first inclined surface for abutting and engaging with the push ring.

[0020] Preferably, the elastic element includes a preload spring that passes through the preload hole and is connected at both ends to the adjacent end faces of the preload block and the push block, respectively.

[0021] Preferably, the positioning element includes a fixing block that passes through a reset groove formed along the length of the positioning rod, and a reset spring that passes through the reset groove and is connected at both ends to the fixing block and the wall of the reset groove, respectively. When the reset spring is in the normal extended state, the end of the positioning rod near the extended rod is located at the opening of the positioning hole.

[0022] Preferably, the stiffness of the preload spring is less than that of the return spring. When the adjusting assembly moves along the axial direction of the telescopic arm, the push ring first overcomes the elastic force of the preload spring to drive the preload block to press the extension rod, and then overcomes the elastic force of the return spring to drive the positioning rod to move closer to the extension rod.

[0023] Preferably, the end of the positioning rod away from the extension rod passes through the positioning hole, and the end of the positioning rod that passes through is provided with a second inclined surface for abutting and cooperating with the push ring. The distance between the first and second inclined surfaces and the end face of the push ring gradually increases in the direction away from the extension rod.

[0024] Preferably, a positioning groove is provided at one end of the positioning rod near the extension rod, and the positioning groove matches the side of the extension rod body. A positioning strip is provided on the bottom wall of the positioning groove, and positioning grooves matching the positioning strip are provided at equal intervals along the length of the extension rod body.

[0025] Preferably, an elastic washer is fixedly provided on the end face of the extension rod away from the telescopic arm. The end face area of ​​the elastic washer is larger than the end face area of ​​the extension rod, and the elastic washer is used to abut against the wall.

[0026] Preferably, the end face of the pre-tightening block near the extension rod has an arc-shaped concave surface that matches the outer wall of the extension rod, and the arc-shaped concave surface is provided with anti-slip texture.

[0027] The beneficial effects of this invention are:

[0028] 1. A pre-tightening hole and a positioning hole are sequentially arranged on the telescopic arm. A pre-tightening block and a pre-tightening spring are slidably installed in the pre-tightening hole, and a positioning rod with a positioning strip passes through the positioning hole. When the adjusting ring moves along the axial direction of the telescopic arm, the pushing ring first presses against the first inclined surface of the pushing block, driving the pre-tightening block to press against the outer wall of the extension rod with a first pre-tightening force, thus achieving pre-tightening. This ensures that the extension rod can slide smoothly without free movement during adjustment. After adjustment, the adjusting ring is rotated again, causing the pushing ring to press against the second inclined surface of the positioning rod, driving the positioning rod to move towards the extension rod. The positioning strip is embedded in the positioning groove on the extension rod body, achieving mechanical positioning and locking. This two-stage locking mechanism of "pre-tightening-positioning" optimizes the existing two-step operation of "adjustment-locking" into a three-stage operation of "pre-tightening adjustment-fine-tuning positioning-mechanical locking," significantly improving the convenience and accuracy of installation and adjustment.

[0029] 2. Both the push block and the positioning rod have inclined surfaces on their end faces extending from the telescopic arm. The distance between the first and second inclined surfaces and the end face of the push ring gradually increases in the direction away from the extension rod. When the push ring moves axially along the telescopic arm, it smoothly pushes the push block and the positioning rod towards the extension rod through the inclined surfaces. This inclined surface drive method achieves a gradual increase in preload from the first preload to the second preload, as well as a smooth transition from the preload state to the positioning and locking state, providing clear operation feel and precise control.

[0030] 3. A positioning groove is provided at the end of the positioning rod near the extension rod, and a positioning strip is provided on the bottom wall of the positioning groove. Multiple positioning slots that match the positioning strip are evenly spaced on the extension rod. After adjustment, the positioning strip is embedded into the corresponding positioning slot, forming a mechanical locking, rather than relying solely on friction for locking. This mechanical positioning method fundamentally avoids the problem of locking force attenuation and loosening caused by factors such as vibration and temperature changes, improving the installation reliability and safety of the distribution box for long-term use.

[0031] 4. The stiffness of the preload spring is less than that of the return spring. When the adjusting assembly moves along the axial direction of the telescopic arm, the push ring first overcomes the elastic force of the preload spring to drive the preload block to press against the extension rod, and then overcomes the elastic force of the return spring to drive the positioning rod to move closer to the extension rod. This spring stiffness difference design ensures the "preload before positioning" action sequence, avoiding the problem of positioning failure caused by the positioning rod acting before the preload block.

[0032] 5. Four telescopic rods are arranged in a rectangular array vertically on the end face of the mounting plate, and the extension length of each rod can be adjusted independently. During installation, first pre-tighten each telescopic rod, then attach the mounting plate to the irregular wall surface. Each extension rod slides to the appropriate position according to the unevenness of different parts of the wall surface, and finally locks them all together. This multi-point independent adaptive adjustment method can accurately adapt to various irregular wall surfaces, ensuring that the mounting plate remains horizontal and the distribution box is firmly installed.

[0033] 6. The telescopic rod is a hollow tubular structure with an inner cavity forming an installation channel for expansion bolts. The mounting plate has openings that communicate with both the telescopic and installation channels. After the telescopic rod is adjusted and locked in place, the expansion bolts can be directly inserted through the hollow channel of the telescopic rod into the mounting holes on the wall, fixing the mounting plate to the wall. The telescopic rod simultaneously serves the dual functions of "length adjustment" and "bolt insertion channel," eliminating the need for additional expansion bolt holes on the mounting plate, simplifying the structure, reducing the number of parts, and shortening installation time. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a simplified structural diagram of the distribution box adapted for installation on irregularly shaped walls, as proposed in this invention.

[0036] Figure 2 This is a schematic diagram of the mounting plate structure of the present invention.

[0037] Figure 3 This is a schematic diagram of the telescopic rod structure of the present invention.

[0038] Figure 4 This is a schematic diagram of the telescopic rod structure viewed from below according to the present invention.

[0039] Figure 5 This is a schematic diagram of the telescopic rod deployment structure of the present invention.

[0040] Figure 6 This is a schematic diagram of the pre-tightening component and the positioning component of the present invention.

[0041] Figure 7This is a schematic diagram of the cross-sectional structure of the telescopic rod of the present invention.

[0042] Figure 8 This is a schematic diagram of the cross-sectional structure of the telescopic rod, pre-tensioning component, and positioning component of the present invention.

[0043] Figure 9 This is a schematic diagram of the telescopic arm structure of the present invention.

[0044] In the diagram: 1. Mounting plate; 2. Distribution box; 3. Telescopic rod; 4. Telescopic arm; 5. Extension rod; 6. Telescopic channel; 7. Installation channel; 8. Pre-tightening hole; 9. Positioning hole; 10. Expansion bolt; 11. Connecting hole; 12. Pre-tightening block; 13. Pre-tightening spring; 14. Push block; 15. First inclined surface; 16. Positioning rod; 17. Return spring; 18. Fixing block; 19. Return groove; 20. Second inclined surface; 21. Positioning groove; 22. Positioning strip; 23. Positioning groove; 24. Adjusting ring; 25. Push ring. Detailed Implementation

[0045] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0046] Given the booming development of the building electrical installation industry, the demand for distribution boxes, as core equipment for power distribution and control, continues to rise, and they occupy an important position in the installation and construction of various building sites. However, existing technologies present significant problems and difficulties in installing distribution boxes on irregularly shaped walls. Building walls often have varying degrees of unevenness, tilting, and other defects, especially in scenarios such as renovation of old buildings, bare walls, and irregularly shaped walls, where the flatness of the wall surface is difficult to meet the requirements for direct installation of distribution boxes. Traditional distribution box installation methods often involve filling shims or supports between the distribution box and the wall for leveling, which is not only cumbersome and inaccurate, but also prone to loosening and falling off the shims over long-term use, affecting the reliability of the distribution box installation. Existing telescopic adjustment mounting brackets mostly use a single locking method. During the adjustment process, the telescopic rod lacks effective pre-tightening and temporary fixing means. Operators need to support the mounting plate to maintain its posture while performing the locking operation, which is not only inconvenient to operate but also makes it difficult to achieve precise adjustment. At the same time, the existing locking methods mostly rely on friction, which is prone to weakening due to vibration, temperature changes and other factors during long-term use, posing a risk of loosening. Furthermore, the existing telescopic rod structure has a single function, only undertaking the length adjustment function. The final fixing of the mounting plate to the wall still requires the drilling of expansion bolt holes, which increases the structural complexity and installation steps.

[0047] This invention provides a distribution box adapted for installation on irregularly shaped walls. The distribution box 2 consists of four telescopic rods 3 vertically mounted in a rectangular array on the end face of the mounting plate 1 near the wall. Each telescopic rod 3 includes a telescopic arm 4 fixedly mounted on the end face of the mounting plate 1, an extension rod 5 with one end movably passing through a telescopic channel 6 at the end of the telescopic arm 4, a pre-tightening component and a positioning component mounted on the telescopic arm 4, and an adjustment component mounted on the telescopic arm 4 that sequentially controls the operation of the pre-tightening component and the positioning component. By moving the adjustment component along the axial direction of the telescopic arm 4, the pre-tightening component and the positioning component are sequentially driven to operate, so that the pre-tightening block 12 presses the outer wall of the extension rod 5 with a first pre-tightening force to achieve pre-tightening. After the mounting plate 1 is adjusted, the adjustment component is controlled to lock the end of the positioning rod 16 to the extension rod. This two-stage locking mechanism of "pre-tightening-positioning" optimizes the existing two-step operation of "adjustment-locking" into a three-stage operation of "pre-tightening adjustment-fine-tuning positioning-mechanical locking," significantly improving the convenience and accuracy of installation and adjustment. Simultaneously, the mechanical interlocking locking method between the positioning strip 22 and the positioning groove 23 fundamentally avoids the problems of locking force attenuation and loosening caused by factors such as vibration and temperature changes. Furthermore, the extension rod 5 adopts a hollow tubular structure that also serves as a channel for expansion bolts, achieving a dual function of length adjustment and bolt insertion. This distribution box 2 has a stable structure and is easy to operate, effectively improving the convenience of installation and adjustment and the reliability of locking on irregularly shaped walls, ensuring the long-term safe operation of the distribution box 2.

[0048] Example 1: Reference Figures 1-9 The diagram shows a distribution box adapted for installation on irregularly shaped walls, including a mounting plate 1 and a distribution box 2 fixed to the back of the mounting plate 1. Four telescopic rods 3 are vertically mounted in a rectangular array on the end face of the mounting plate 1 near the wall. Each telescopic rod 3 includes a telescopic arm 4 fixedly mounted on the end face of the mounting plate 1, an extension rod 5 that is movably inserted through a telescopic channel 6 at the end of the telescopic arm 4, a pre-tightening component and a positioning component set on the telescopic arm 4, and an adjustment component set on the telescopic arm 4 that sequentially controls the operation of the pre-tightening component and the positioning component. The outer wall of the telescopic arm 4 has a pre-tightening hole 8 and a positioning hole 9 sequentially opened along the direction away from the mounting plate 1, which communicate with the interior of the telescopic channel 6. The extension rod 5 is a hollow tubular structure, and its inner cavity forms an installation channel 7 for expansion bolts to pass through. After passing through the inner cavity of the extension rod 5, the expansion bolts pass through the installation hole on the wall. The mounting plate 1 has a connecting hole 11 that communicates with the telescopic channel 6 and the installation channel 7.

[0049] The pre-tightening assembly includes a pre-tightening block 12 that slides through the pre-tightening hole 8 near the opening of the extension rod 5, and an elastic element disposed in the pre-tightening hole 8 and connected to the pre-tightening block 12. The elastic element is in a normal state.

[0050] The positioning assembly includes a positioning rod 16 that slides through the positioning hole 9 near the opening of one end of the extension rod 5, and a positioning element disposed in the positioning hole 9 and connected to the positioning rod 16.

[0051] When the adjusting component moves along the axial direction of the telescopic arm 4, it sequentially drives the pre-tightening component and the positioning component to move, so that the pre-tightening block 12 presses the outer wall of the extension rod 5 with the first pre-tightening force to achieve pre-tightening. After the mounting plate 1 is adjusted, the adjusting component controls the positioning rod 16 to lock the end of the extension rod 5.

[0052] During installation in this embodiment, the extension rods 5 of the four telescopic rods 3 vertically mounted in a rectangular array on the end face of the mounting plate 1 near the wall are first placed against the corresponding positions on the irregular wall surface. Then, the adjusting component 17 on the telescopic arm 4 is rotated, causing the adjusting component 17 to move towards the wall surface along the axial direction of the telescopic arm 4. The pushing ring 18 at the end of the adjusting component 17 first abuts against the first inclined surface 15 at the end of the pushing block 13 slidably disposed in the pre-tightening hole 8 in the pre-tightening component, and compresses the pre-tightening spring 14 in the pre-tightening hole 8 through the pushing block 13. The pre-tightening spring 14 pushes the pre-tightening block 12, which slides through the opening position of the pre-tightening hole 8 near the extension rod 5, to move towards the extension rod 5, so that the pre-tightening block 12... 2. Pre-tightening is achieved by pressing the outer wall of the extension rod 5 with the first pre-tightening force. At this time, the arc-shaped concave surface of the pre-tightening block 12, which is adapted to the outer wall of the extension rod 5, increases the contact area. The anti-slip texture on the arc-shaped concave surface further increases the friction, so that each extension rod 5 can slide smoothly in the telescopic channel 6 to adapt to the unevenness of the wall surface, without moving freely, thus providing a stable temporary positioning for the posture adjustment of the mounting plate 1. Next, according to the different degrees of unevenness of each position on the irregular wall surface, the operator pushes the extension rods 5 of the four telescopic rods 3 to slide to the appropriate position in the telescopic channel 6 to adjust the horizontality and verticality of the mounting plate 1, so that the mounting plate 1 and the irregular wall surface maintain the desired position. The required installation posture; after the posture of the mounting plate 1 is adjusted, continue to rotate the adjustment component 17 so that it continues to move towards the wall along the axis of the telescopic arm 4. During the continued movement, the push ring 18 at the end of the adjustment component 17 abuts against the second inclined surface 21 at the end of the positioning rod 16, which slides through the positioning hole 9 near the end of the extension rod 5 in the positioning component. This pushes the positioning rod 16 to overcome the elastic force of the return spring 20 in the positioning hole 9 and move towards the extension rod 5. The positioning groove 22 opened at the end of the positioning rod 16 near the end of the extension rod 5 abuts against the side of the extension rod 5. The positioning strip 23 set on the bottom wall of the positioning groove 22 is embedded in the positioning grooves 24 that are equally spaced along the length of the extension rod 5, forming Mechanical locking and clamping are used to achieve stable fixation of the relative position between the extension rod 5 and the telescopic arm 4. At this time, the lengths of the four telescopic rods 3 are precisely matched with the concavity and convexity of the corresponding positions on the irregular wall surface, and the mounting plate 1 remains horizontal. Finally, the expansion bolts are inserted through the connecting holes 11 on the mounting plate 1 that are connected to the telescopic channel 6 and the installation channel 7, then through the telescopic channel 6 inside the telescopic arm 4 and into the installation channel 7 formed by the hollow tubular structure of the extension rod 5. They are then inserted into the pre-drilled installation holes on the wall and locked, thereby firmly installing the mounting plate 1 on the irregular wall surface. The distribution box 2 is then fixed to the back of the mounting plate 1, thus completing the fast, accurate and stable installation of the distribution box 2 on the irregular wall surface.The stiffness difference design between the pre-tensioning spring 14 and the return spring 20 ensures that the pushing ring 18 first overcomes the elastic force of the pre-tensioning spring 14 to complete the pre-tensioning action, and then overcomes the elastic force of the return spring 20 to complete the positioning and locking action, thus ensuring the action sequence of "pre-tensioning before positioning". The adjusting component 17 drives the pre-tensioning component and the positioning component to move sequentially through the rotation of a single adjusting ring 19, realizing the composite control of pre-tensioning and positioning. The independent adjustment of the four telescopic rods 3 realizes multi-point self-adaptation and precise adaptation to irregular wall surfaces. The mechanical interlocking and locking of the positioning strip 23 and the positioning groove 24 fundamentally ensures the reliability of locking. The hollow design of the extension rod 5 realizes the combination of length adjustment and expansion bolt insertion functions, simplifying the structure, reducing the number of parts, and shortening the installation time.

[0053] The adjustment component controls the pre-tightening component and the positioning component. This embodiment provides the following solution:

[0054] like Figures 3-5 As shown, the adjustment assembly includes an adjustment ring 24 sleeved on the outside of the telescopic arm 4 and threadedly connected to the body of the telescopic arm 4, and a push ring 25 disposed on the end of the adjustment ring 24 near the wall.

[0055] In this embodiment, an adjusting ring 24 is rotatably sleeved on the outside of the telescopic arm 4 and threadedly connected to the body of the telescopic arm 4. Under the action of the threaded engagement, the adjusting ring 24 slowly moves towards the wall along the axial direction of the telescopic arm 4. The pushing ring 25, which is fixedly set on the end of the adjusting ring 24 near the wall, moves synchronously with the adjusting ring 24. During the movement, the pushing ring 25 first abuts against the first inclined surface 15 of the end of the pushing block 13, which is slidably set in the pre-tightening hole 8 and whose end protrudes from the pre-tightening hole 8, and compresses the pre-tightening spring 14 in the pre-tightening hole 8 through the pushing block 13. The pre-tightening spring 14 pushes the pre-tightening block 12 to move towards the extension rod 5, so that the pre-tightening block 12 presses the outer wall of the extension rod 5 with the first pre-tightening force to achieve pre-tightening, thus providing a sliding tension for the extension rod 5 in the telescopic channel 6. The adjustable resistance allows the extension rod 5 to slide smoothly according to the unevenness of the wall surface without moving freely, facilitating precise adjustment of the mounting plate 1's posture by the operator. After the mounting plate 1's posture is adjusted, the adjusting ring 24 is rotated, pushing the ring 25 to move closer to the wall surface and abut against the second inclined surface 21 at the end of the positioning rod 16 in the positioning assembly. This pushes the positioning rod 16 to overcome the elastic force of the return spring 20 and move closer to the extension rod 5, causing the positioning strip 23 at the end of the positioning rod 16 to embed into the positioning groove 24 of the extension rod 5's body, achieving mechanical locking. The adjusting ring 24 maintains the axial position of the pushing ring 25 unchanged through the self-locking characteristic of the threaded connection, thereby maintaining the compression state of the preload spring 14 and the return spring 20, ensuring that the preload and locking forces remain effective.

[0056] like Figure 6 and Figure 8As shown, the pre-tightening assembly also includes a push block 14 slidably disposed in the pre-tightening hole 8. The push block 14 is located at the opening position of the end of the pre-tightening hole 8 away from the extension rod 5, and the end of the push block 14 protrudes out of the pre-tightening hole 8. The protruding end of the push block 14 is provided with a first inclined surface 15 for abutting and cooperating with the push ring 25.

[0057] In this embodiment, when the adjusting ring 24 moves axially towards the wall along the telescopic arm 4, the pushing ring 25 moves synchronously with the adjusting ring 24 and first abuts against the first inclined surface 15 provided at the end of the pushing block 14 that passes through the pre-tightening hole 8. The pushing ring 25 converts the axial thrust into a driving force that drives the pushing block 14 to move radially towards the extension rod 5 along the pre-tightening hole 8 through the guiding effect of the first inclined surface 15. The pushing block 14 compresses the pre-tightening spring 22, which is provided in the pre-tightening hole 8 and whose two ends are respectively connected to the pre-tightening block 12 and the adjacent end face of the pushing block 14. After being compressed, the pre-tightening spring 22 generates an elastic restoring force and acts on the pre-tightening block 12, which slides through the opening of the pre-tightening hole 8 near the end of the extension rod 5, pushing the pre-tightening block 12 to move towards the extension rod 5 and then... A pre-tightening force presses against the outer wall of the extension rod 5. At this time, the push ring 25 and the first inclined surface 15 remain in contact. The compression of the pre-tightening spring 22 is determined by the axial position of the push ring 25, thereby achieving precise control of the pre-tightening force. Through the cooperation between the push ring 25 and the first inclined surface 15, the axial rotation of the adjusting ring 24 is converted into radial pressure of the pre-tightening block 12 on the extension rod 5. This causes the extension rod 5 to experience controllable frictional resistance when sliding in the telescopic channel 6. This ensures that the extension rod 5 can slide freely according to the unevenness of various positions on the irregular wall surface to adjust the posture of the mounting plate 1. It also prevents the extension rod 5 from accidentally moving under gravity or external force, providing the operator with a stable adjustment feel and facilitating precise control of the horizontality and verticality of the mounting plate 1.

[0058] like Figure 5 and Figure 6 As shown, the elastic element includes a preload spring 13 that passes through the preload hole 8 and is connected at both ends to the adjacent end faces of the preload block 12 and the push block 14, respectively.

[0059] In this embodiment, when the pushing ring 25 abuts against the first inclined surface 15 at the end of the pushing block 14 and pushes the pushing block 14 to move closer to the extension rod 5, the pushing block 14 compresses the pre-tightening spring 13, which is inserted into the pre-tightening hole 8 and whose two ends are respectively connected to the pre-tightening block 12 and the adjacent end face of the pushing block 14. The elastic restoring force generated by the compressed pre-tightening spring 13 is directly transmitted to the pre-tightening block 12, which slides through the pre-tightening hole 8 near the opening of the extension rod 5, driving the pre-tightening block 12 to move closer to the extension rod 5 and press against the outer wall of the extension rod 5 with the first pre-tightening force. The compression amount of the pre-tightening spring 13 is determined by the axial displacement of the pushing ring 25. The greater the moving distance of the moving ring 25, the greater the compression of the pre-tightening spring 13 and the greater the pre-tightening force, thus achieving continuous adjustment of the pre-tightening force. The elastic deformation of the pre-tightening spring 13 converts the displacement of the pushing block 14 into a stable pre-tightening force on the extension rod 5. The selection of the stiffness of the pre-tightening spring 13 ensures that the pressure of the pre-tightening block 12 on the extension rod 5 remains constant and uniform during the adjustment process, avoiding jamming or damage caused by rigid compression. At the same time, the pre-tightening spring 13 can automatically reset when the adjusting ring 24 rotates in the opposite direction, pushing the pre-tightening block 12 and the pushing block 14 back to their initial positions, releasing the pre-tightening state of the extension rod 5, which facilitates the secondary adjustment or disassembly of the mounting plate.

[0060] like Figures 6-8 As shown, the positioning component includes a fixing block 18 that passes through a reset groove 19 along the length of the positioning rod 16, and a reset spring 17 that passes through the reset groove 19 and is connected at both ends to the fixing block 18 and the groove wall of the reset groove 19, respectively. When the reset spring 17 is in the normal extended state, the end of the positioning rod 16 near the extension rod 5 is located at the opening of the positioning hole 9.

[0061] In this embodiment, when the adjusting ring 24 continues to rotate, causing the pushing ring 25 to abut against the second inclined surface 21 at the end of the positioning rod 16 and pushing the positioning rod 16 towards the extension rod 5, the fixing block 18, which is fixedly installed on the inner wall of the positioning hole 9, remains stationary within the reset groove 19 opened along the length direction of the positioning rod 16. The fixing block 18 compresses the reset spring 17, which is connected to the wall of the reset groove 19 at both ends. After being compressed, the reset spring 17 generates elastic restoring force and stores energy. The positioning rod 16 moves towards the extension rod 5 until the positioning strip 23 at its end is embedded in the positioning groove 24 of the extension rod 5, achieving mechanical locking. When the adjusting ring 24 rotates in the opposite direction, causing the pushing ring 25 to disengage from the positioning rod 16, the positioning is reset. Spring 17 releases its elastic restoring force and pushes the wall of reset groove 19 away from the extension rod 5, driving positioning rod 16 away from the extension rod 5 until reset spring 17 is in its normal extended state. At this time, the end of positioning rod 16 near the extension rod 5 is located at the opening of positioning hole 9, positioning strip 23 is completely disengaged from positioning groove 24, and locking of extension rod 5 is released. Through the elastic reset function of reset spring 17, positioning rod 16 is ensured to automatically return to the opening of positioning hole 9 in the non-locked state, avoiding interference from the end of positioning rod 16 with the free sliding of extension rod 5 in telescopic channel 6. At the same time, the elastic force stored in reset spring 17 during locking can be quickly released when adjusting ring 24 rotates in the opposite direction, facilitating secondary adjustment or disassembly of mounting plate 1.

[0062] The stiffness of the pre-tightening spring 13 is less than that of the return spring 17. When the adjusting assembly moves along the axial direction of the telescopic arm 4, the pushing ring 25 first overcomes the elastic force of the pre-tightening spring 13 to drive the pre-tightening block 12 to press the extension rod 5, and then overcomes the elastic force of the return spring 17 to drive the positioning rod 16 to move closer to the extension rod 5. The stiffness difference design ensures that the pre-tightening action is completed before the positioning action during the axial movement of the pushing ring 25 along the telescopic arm 4. This avoids the problem that the positioning rod 16 will lock prematurely before the extension rod 5 is pre-tightened and fixed, which would prevent the extension rod 5 from sliding and adjusting. This ensures the reliable execution of the predetermined working sequence of "pre-tightening adjustment first, then positioning and locking", and improves the smoothness of installation and adjustment and the reliability of locking.

[0063] like Figure 5 and Figure 6 As shown, the end of the positioning rod 16 away from the extension rod 5 passes through the positioning hole 9. The end of the positioning rod 16 that passes through is provided with a second inclined surface 20 for abutting and cooperating with the push ring 25. The distance between the first inclined surface 15 and the second inclined surface 20 and the end face of the push ring 25 gradually increases in the direction away from the extension rod 5.

[0064] In this embodiment, when the adjusting ring 24 drives the pushing ring 25 to move axially towards the wall along the telescopic arm 4, the end face of the pushing ring 25 first abuts against the lower position of the first inclined plane 15 closest to the end face of the pushing ring 25. As the pushing ring 25 continues to move, the end face of the pushing ring 25 slides along the first inclined plane 15 to a higher position, gradually increasing the thrust on the pushing block 14 through the guiding effect of the inclined plane, thus gradually increasing the preload of the preload of the preload block 12 on the extension rod 5. When the end face of the pushing ring 25 passes the highest point of the first inclined plane 15, the end face of the pushing ring 25 abuts against the lower position of the second inclined plane 20. As the pushing ring 25 continues to move, the end face of the pushing ring 25 slides along the second inclined plane 20 to a higher position, gradually increasing the thrust on the pushing block 14 through the guiding effect of the inclined plane. The force applied to the positioning rod 16 gradually increases, causing the positioning rod 16 to move progressively closer to the extension rod 5. Through the design that the distance between the first inclined surface 15, the second inclined surface 20, and the end face of the push ring 25 gradually increases in the direction away from the extension rod 5, a smooth switching is achieved where, during the axial movement of the push ring 25 along the telescopic arm 4, the pre-tightening component is driven by a smaller thrust to complete progressive pre-tightening, and then the positioning component is driven by a gradually increasing thrust to complete progressive locking. This ensures that the pre-tightening force and locking force are applied progressively, avoiding impact and sudden changes. Simultaneously, the operator can perceive the switching points between the pre-tightening and positioning stages by adjusting the rotation feel of the ring 24, improving operational controllability and installation accuracy.

[0065] like Figures 3-8 As shown, a positioning groove 21 is provided at one end of the positioning rod 16 near the extension rod 5, and the positioning groove 21 matches the side of the extension rod 5. A positioning strip 22 is provided on the bottom wall of the positioning groove 21, and positioning grooves 23 matching the positioning strip 22 are provided at equal intervals along the length of the extension rod 5.

[0066] In this embodiment, when the pushing ring 25 abuts against the second inclined surface 20 at the end of the positioning rod 16 and pushes the positioning rod 16 to move closer to the extension rod 5, the positioning groove 21 first fits against the side of the extension rod 5, achieving circumferential positioning and maximizing the contact area between the positioning rod 16 and the extension rod 5. As the positioning rod 16 continues to move closer to the extension rod 5, the positioning strip 22, which is fixedly set on the bottom wall of the positioning groove 21, moves closer to the extension rod 5 and is embedded in the positioning groove 23, which is equally spaced along the length of the extension rod 5 and matches the cross-sectional shape of the positioning strip 22, forming a mechanical fitting and locking between the positioning strip 22 and the positioning groove 23. At this time, the groove surface of the positioning groove 21 fits against the side of the extension rod 5, providing circumferential positioning for the positioning rod 16. The positioning strip 22 is embedded in the positioning groove 23 to provide axial positioning of the positioning rod 16. The double positioning function completely locks the relative position between the extension rod 5 and the telescopic arm 4. The fitting between the positioning groove 21 and the side of the extension rod 5 ensures accurate alignment between the positioning rod 16 and the extension rod 5, avoiding the positioning strip 22 from shifting and failing to accurately fit into the positioning groove 23. At the same time, the mechanical fitting and locking method of the positioning strip 22 and the positioning groove 23 has higher shear resistance and vibration resistance and anti-loosening performance compared with simple friction locking. The multiple positioning grooves 23 with equal spacing can reliably lock the extension rod 5 at different extension length positions, thus ensuring that the mounting plate 1 can be stably and reliably fixed after adjusting its posture on the irregular wall surface.

[0067] An elastic washer is fixedly installed on the end face of the extension rod 5 away from the telescopic arm 4. The end face area of ​​the elastic washer is larger than the end face area of ​​the extension rod 5. The elastic washer is used to abut against the wall.

[0068] In this embodiment, when the mounting plate 1 is close to the wall so that the ends of the extension rods 5 of the four telescopic rods 3 abut against the corresponding positions on the irregular wall surface, the elastic pads first contact the wall surface and undergo elastic deformation under the pressing pressure of the mounting plate 1. The elastic pads, with their larger contact surface area than the end face of the extension rods 5, disperse the concentrated pressure of the extension rods 5 against the wall surface into a uniformly distributed surface pressure, thus avoiding localized pressure damage or crushing of the wall surface caused by the direct rigid contact of the extension rods 5 against the wall surface. Simultaneously, the elastic deformation of the elastic pads can adapt to the micro-unevenness of the wall surface, automatically compensating for the unevenness of the wall surface at a microscale, ensuring a stable fit between the ends of each extension rod 5 and the wall surface. During the adjustment of the mounting plate 1, the frictional force between the elastic pads and the wall surface is greater than the frictional force during rigid contact, making the positioning of the ends of the extension rods 5 on the wall surface more stable and preventing… During adjustment, the end of the extension rod 5 slides along the wall, causing changes in the already adjusted extension length of the extension rod 5. After the mounting plate 1 is locked and fixed to the wall by the expansion bolts, the elastic gasket is in a continuously compressed state. Its elastic restoring force continuously acts between the wall and the extension rod 5, providing a continuous elastic preload to the mounting plate 1. This effectively absorbs and buffers the impact of environmental vibration on the connection structure between the mounting plate 1 and the wall, preventing the expansion bolts from loosening during long-term use. At the same time, the elastic gasket seals the gap between the end of the extension rod 5 and the wall, preventing dust and moisture from entering the telescopic channel 6 through this gap, protecting the internal structure of the telescopic rod 3 from external environmental corrosion. Through its large end face area, elastic deformation capacity, and friction characteristics, the elastic gasket simultaneously achieves multiple functions such as wall protection, micro-unevenness compensation, anti-slip positioning, vibration buffering, and environmental sealing.

[0069] The end face of the pre-tightening block 12 near the extension rod 5 has an arc-shaped concave surface that matches the outer wall of the extension rod 5, and anti-slip texture is provided on the arc-shaped concave surface.

[0070] In this embodiment, when the pushing ring 25 abuts against the first inclined surface 15 at the end of the pushing block 14 and drives the pre-tightening block 12 to move closer to the extension rod 5, the arc-shaped concave surface fits against the outer wall surface of the extension rod 5. The contact method between the arc-shaped concave surface and the outer wall of the extension rod 5 is a surface contact between the arc surface and the cylindrical surface. The contact area is much larger than the line contact or point contact between the plane and the cylindrical surface, so that the pressure applied by the pre-tightening block 12 to the outer wall of the extension rod 5 is evenly distributed in the arc-shaped concave surface area, avoiding pressure concentration in a local area that could cause indentations or damage to the outer wall of the extension rod 5. At the same time, the anti-slip texture provided on the arc-shaped concave surface is embedded in the micro-pits on the outer wall surface of the extension rod 5 when the pre-tightening block 12 presses against the outer wall of the extension rod 5, significantly increasing the slip resistance. The coefficient of friction between the pretension block 12 and the outer wall of the extension rod 5 allows the anti-slip texture to provide greater friction under the same pretension force, effectively preventing the extension rod 5 from accidentally sliding within the telescopic channel 6 due to vibration or external force, and ensuring the stability of the relative position between the extension rod 5 and the telescopic arm 4 under pretension. The arc-shaped concave surface increases the contact area to achieve uniform distribution of pretension force, avoiding stress concentration damage to the outer wall of the extension rod 5. At the same time, the anti-slip texture improves the reliability of pretension by increasing the coefficient of friction. The synergistic effect of both ensures that the pretension assembly can provide a stable and reliable pretension force to the extension rod 5 under different pretension force levels, extending the service life of the telescopic rod 3.

[0071] The usage process of this invention:

[0072] First, prepare for installation: According to the actual shape and size of the irregular wall, the operator marks the installation positions of the four telescopic rods 3 on the wall and makes four corresponding installation holes for expansion bolts to pass through. At the same time, the extension rods 5 of the four telescopic rods 3, which are vertically installed in a rectangular array on the end face of the mounting plate 1 near the wall, are respectively aligned with the corresponding positions marked on the wall.

[0073] Then, a coarse pre-tightening operation is performed: The operator rotates the adjusting ring 24 on each telescopic rod 3, which is sleeved on the outside of the telescopic arm 4 and threaded to the body of the telescopic arm 4. Under the action of the threaded engagement, the adjusting ring 24 moves slowly along the axial direction of the telescopic arm 4 towards the wall. The pushing ring 25, which is fixedly set on the end of the adjusting ring 24 near the wall, moves synchronously with the adjusting ring 24. During the movement, the pushing ring 25 first abuts against the first inclined surface 15 of the end of the pushing block 14, which is slidably set in the pre-tightening hole 8 and whose end protrudes from the pre-tightening hole 8 in the pre-tightening assembly. The pushing block 14 compresses the pre-tightening spring 13 in the pre-tightening hole 8. After being compressed, the pre-tightening spring 13 generates an elastic restoring force and pushes the sliding block 14. The pre-tightening block 12, which is installed at the opening of the pre-tightening hole 8 near the end of the extension rod 5, moves towards the extension rod 5, so that the pre-tightening block 12 presses the outer wall of the extension rod 5 with the first pre-tightening force to achieve pre-tightening. At this time, the arc-shaped concave surface of the pre-tightening block 12 near the end face of the extension rod 5, which is adapted to the outer wall of the extension rod 5, fits against the surface of the outer wall of the extension rod 5. The anti-slip texture provided on the arc-shaped concave surface is embedded in the micro-pits on the surface of the outer wall of the extension rod 5, which significantly increases the friction between the pre-tightening block 12 and the outer wall of the extension rod 5. This pre-tightening operation allows each extension rod 5 to slide smoothly in the telescopic channel 6 according to the unevenness of the wall surface to adapt to the unevenness of the wall surface, and will not move freely due to gravity or external force.

[0074] Next, fine-tuning and positioning are performed: according to the different degrees of concavity and convexity at various positions on the irregular wall surface, the operator pushes the extension rods 5 of the four telescopic rods 3 to slide axially along the telescopic channel 6 to their respective suitable positions, so as to adjust the horizontality and verticality of the mounting plate 1 and maintain the required installation posture between the mounting plate 1 and the irregular wall surface; during the fine-tuning process, due to the controllable frictional resistance provided by the pre-tension spring 13, the sliding of each extension rod 5 has a stable damping feel, which makes it easy for the operator to accurately control the extension length of each extension rod 5.

[0075] Then, the final locking operation is performed: After the attitude adjustment of the mounting plate 1 is completed, the operator continues to rotate the adjusting ring 24 to move it closer to the wall along the axial direction of the telescopic arm 4. During the continued movement, the pushing ring 25 abuts against the second inclined surface 20 at the end of the positioning rod 16, which slides through the positioning hole 9 near the end of the extension rod 5 in the positioning assembly. Since the stiffness of the pre-tightening spring 13 passing through the pre-tightening hole 8 is less than the stiffness of the reset spring 17 passing through the reset groove 19 along the length direction of the positioning rod 16, the axial thrust applied by the pushing ring 25 continues to increase after overcoming the elastic force of the pre-tightening spring 13, and then overcomes the elastic force of the reset spring 17 and pushes the positioning rod 16 closer to the extension rod 5. The positioning groove 21, which is opened at one end of the positioning rod 16 near the extension rod 5, first fits against the cylindrical side of the extension rod 5, realizing circumferential positioning between the positioning rod 16 and the extension rod 5. As the positioning rod 16 continues to move closer to the extension rod 5, the positioning strip 22, which is fixedly set on the bottom wall of the positioning groove 21, is embedded in the positioning groove 23, which is opened at equal intervals along the length of the extension rod 5 and matches the cross-sectional shape of the positioning strip 22, forming a mechanical engagement and locking between the positioning strip 22 and the positioning groove 23. The adjusting ring 24 keeps the axial position of the pushing ring 25 unchanged through the self-locking characteristic of the threaded connection, thereby maintaining the compression state of the preload spring 13 and the return spring 17, ensuring that the preload and locking force are continuously effective.

[0076] Next, the expansion bolt fixing operation is carried out: the operator inserts the expansion bolt through the connection hole 11 on the mounting plate 1, which is connected to the telescopic channel 6 and the installation channel 7, through the telescopic channel 6 inside the telescopic arm 4, and then into the installation channel 7 formed by the hollow tubular structure of the extension rod 5. It is then inserted into the installation hole pre-drilled on the wall and the expansion bolt is tightened with a tool, thereby firmly installing the mounting plate 1 on the irregular wall surface. During the tightening of the expansion bolt, the elastic gasket fixedly installed on the end face of the extension rod 5 away from the telescopic arm 4 is in close contact with the wall surface. The elastic gasket, with its larger contact surface than the end face area of ​​the extension rod 5, disperses the concentrated pressure of the end of the extension rod 5 on the wall surface into a uniformly distributed surface pressure, avoiding local pressure damage to the wall surface. At the same time, the elastic deformation of the elastic gasket can adapt to the local defects of the wall surface with slight unevenness, ensuring a stable fit between the end of each extension rod 5 and the wall surface.

[0077] Finally, the distribution box installation operation is carried out: the operator fixes the distribution box 2 on the back of the mounting plate 1, thus completing the quick, accurate and stable installation of the distribution box 2 on the irregular wall surface; during the entire use process, if it is necessary to adjust the posture of the mounting plate 1 again, the operator only needs to rotate the adjusting ring 24 in the opposite direction to make the pushing ring 25 disengage from the pushing block 14 and the positioning rod 16. The pre-tightening spring 13 and the return spring 17 will automatically reset and push the pre-tightening block 12 and the positioning rod 16 back to the initial position, releasing the pre-tightening and locking state of the extension rod 5, and the posture adjustment of the mounting plate 1 can be repeated.

[0078] In the usage process, the independent adjustment of the four telescopic rods 3 achieves multi-point self-adaptation, precisely adapting to the unevenness of various positions on the irregular wall surface; the stiffness difference design between the pre-tightening spring 13 and the return spring 17 ensures the action sequence of "pre-tightening before positioning"; the adjusting ring 24 drives the pre-tightening component and the positioning component to move sequentially through a single rotation operation, realizing the composite control of pre-tightening and positioning; the mechanical interlocking and locking of the positioning strip 22 and the positioning groove 23 fundamentally ensures the reliability of locking; the hollow design of the extension rod 5 realizes the combination of length adjustment and expansion bolt insertion functions, simplifying the structure, reducing the number of parts, and shortening the installation time.

[0079] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distribution box (2) adapted for installation on irregularly shaped walls, comprising a mounting plate (1) and a distribution box (2) fixed to the back of the mounting plate (1), characterized in that, The mounting plate (1) has four telescopic rods (3) vertically mounted in a rectangular array on one end face near the wall. The telescopic rods (3) include a telescopic arm (4) fixedly mounted on the end face of the mounting plate (1), an extension rod (5) that is movably inserted through the telescopic channel (6) at the end of the telescopic arm (4), a pre-tightening component and a positioning component set on the telescopic arm (4), and an adjustment component set on the telescopic arm (4) that controls the pre-tightening component and the positioning component to work in sequence. The outer wall of the telescopic arm (4) has a pre-tightening hole (8) and a positioning hole (9) that are connected to the inside of the telescopic channel (6) in sequence along the direction away from the mounting plate (1). The extension rod (5) is a hollow tubular structure, and its inner cavity forms an installation channel (7) for the expansion bolt to pass through. After the expansion bolt passes through the inner cavity of the extension rod (5), it is inserted into the installation hole on the wall. The mounting plate (1) has a connection hole (11) that is connected to the telescopic channel (6) and the installation channel (7). The pre-tightening assembly includes a pre-tightening block (12) that slides through the pre-tightening hole (8) near the opening of the extension rod (5), and an elastic element that is disposed in the pre-tightening hole (8) and connected to the pre-tightening block (12). The elastic element is in a normal state. The positioning assembly includes a positioning rod (16) that slides through the positioning hole (9) near the opening of the extension rod (5), and a positioning element that is disposed in the positioning hole (9) and connected to the positioning rod (16); When the adjusting component moves along the axial direction of the telescopic arm (4), it drives the pre-tightening component and the positioning component to move in sequence, so that the pre-tightening block (12) presses the outer wall of the extension rod (5) with the first pre-tightening force to achieve pre-tightening. After the mounting plate (1) is adjusted, the adjusting component controls the positioning rod (16) to lock the end of the extension rod (5).

2. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 1, characterized in that: The adjustment assembly includes an adjustment ring (24) sleeved on the outside of the telescopic arm (4) and threadedly connected to the body of the telescopic arm (4), and a push ring (25) disposed on the end of the adjustment ring (24) near the wall.

3. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 2, characterized in that: The pre-tightening assembly also includes a push block (14) that is slidably disposed in the pre-tightening hole (8). The push block (14) is located at the opening position of the end of the pre-tightening hole (8) away from the extension rod (5), and the end of the push block (14) protrudes out of the pre-tightening hole (8). The protruding end of the push block (14) is provided with a first inclined surface (15) for abutting and cooperating with the push ring (25).

4. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 3, characterized in that: The elastic element includes a preload spring (13) that passes through the preload hole (8) and is connected at both ends to the adjacent end faces of the preload block (12) and the push block (14).

5. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 4, characterized in that: The positioning component includes a fixing block (18) that passes through the positioning rod (16) and has a reset groove (19) opened along its length, and a reset spring (17) that passes through the reset groove (19) and is connected at both ends to the fixing block (18) and the groove wall of the reset groove (19). When the reset spring (17) is in its normal extended state, the end of the positioning rod (16) near the extension rod (5) is located at the opening of the positioning hole (9).

6. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 5, characterized in that: The stiffness of the preload spring (13) is less than that of the return spring (17). When the adjusting assembly moves along the axial direction of the telescopic arm (4), the push ring (25) first overcomes the elastic force of the preload spring (13) to drive the preload block (12) to press the extension rod (5), and then overcomes the elastic force of the return spring (17) to drive the positioning rod (16) to move closer to the extension rod (5).

7. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 3, characterized in that: The end of the positioning rod (16) away from the extension rod (5) passes through the positioning hole (9). The end of the positioning rod (16) is provided with a second inclined surface (20) for abutting and cooperating with the push ring (25). The distance between the first inclined surface (15) and the second inclined surface (20) and the end face of the push ring (25) gradually increases in the direction away from the extension rod (5).

8. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 1, characterized in that: The positioning rod (16) has a positioning groove (21) at one end near the extension rod (5), and the positioning groove (21) matches the side of the extension rod (5). The bottom wall of the positioning groove (21) is provided with a positioning strip (22), and the extension rod (5) has positioning grooves (23) that match the positioning strips (22) at equal intervals along the length direction.

9. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 1, characterized in that: An elastic pad is fixedly installed on the end face of the extension rod (5) away from the telescopic arm (4). The end face area of ​​the elastic pad is larger than the end face area of ​​the extension rod (5). The elastic pad is used to abut against the wall.

10. The distribution box (2) adapted for installation on irregularly shaped walls according to claim 1, characterized in that: The end face of the pre-tightening block (12) near the extension rod (5) has an arc-shaped concave surface that matches the outer wall of the extension rod (5), and anti-slip texture is provided on the arc-shaped concave surface.

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