Fine adjustment device for installation of bridge deck component

Abstract

The utility model discloses a bridge deck component installation fine adjustment device, which relates to the technical field of bridge construction and comprises a frame, a hanging bracket and a sliding mechanism, the frame can travel, the sliding mechanism is slidably connected with the frame, and the hanging bracket is connected with the sliding mechanism and used for hanging a prefabricated component. The hanging bracket is movably arranged on the vehicle frame through a sliding mechanism and used for enabling the prefabricated part to move in the X direction, the Y direction and the Z direction relative to the vehicle frame. Continuous adjustment of all prefabricated parts can be achieved through the frame, accurate adjustment of a single prefabricated part in the X direction, the Y direction and the Z direction can be achieved through cooperation of the sliding mechanism and the hanging bracket, the automation degree is high, and the adjustment precision is high; the problems of low adjustment precision, low efficiency and high cost when the bridge floor pre-component is adjusted in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a bridge deck component installation and fine-tuning device. Background Art

[0002] At present, prefabricated bridge deck protection walls and cable troughs have replaced the previous cast-in-place AB walls. The entire bridge deck system will adopt prefabricated assembly to achieve industrialized assembly.

[0003] In the prior art, when prefabricated bridge deck components are assembled, the prefabricated components are mainly lifted from the prefabrication yard to the construction site by a truck crane, and then the prefabricated components are lifted to the laying position by the truck crane for rough laying, and finally the position of the prefabricated components is adjusted using a mounting frame for alignment.

[0004] However, a single component weighs 7 tons, and the installation accuracy is required to be within 2mm. At present, prefabricated bridge deck components are mainly lifted and fine-tuned by cranes or forklifts, and are mainly adjusted manually. There are problems such as large equipment investment, poor lifting accuracy, low operating efficiency and high safety risks. In addition, this adjustment method has a discontinuous construction process, large economic investment, and limited applicable working conditions, which is not conducive to promotion. Utility Model Content

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a bridge deck component installation fine-tuning device to solve the problems of low adjustment accuracy, low efficiency and high cost when adjusting bridge deck prefabricated components in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The present application provides a bridge deck component installation fine-adjustment device, comprising:

[0008] A trolley frame;

[0009] The hanger is used for hanging prefabricated components. The hanger is movably arranged on the frame through a sliding mechanism, and is used to move the prefabricated components relative to the frame along the X direction, the Y direction and the Z direction.

[0010] In some optional embodiments, the sliding mechanism includes:

[0011] a longitudinally movable shoulder beam, which is slidably connected to the vehicle frame and can slide relative to the vehicle frame in the X direction;

[0012] The transverse shoulder pole beam is slidably connected to the longitudinal shoulder pole beam and can slide in the Y direction relative to the longitudinal shoulder pole beam. The hanger is suspended below the transverse shoulder pole beam.

[0013] In some optional embodiments, the frame includes:

[0014] A top frame, on which the sliding mechanism is arranged;

[0015] At least three legs are spaced apart and connected to the bottom of the top frame to support the top frame on the bridge deck.

[0016] In some optional embodiments, the top frame includes two spaced-apart horizontal beams and two longitudinal beams connected at both ends of the two horizontal beams. The tops of the longitudinal beams and the longitudinal shoulder beams are provided with sliding rails, and the longitudinal shoulder beams and the transverse shoulder beams are provided with sliding parts that slide in cooperation with the sliding rails.

[0017] In some optional embodiments, the sliding mechanism further comprises a telescopic oil cylinder, a fixed end of which is fixedly connected to the cross beam, and a telescopic end of which is connected to the longitudinal shoulder beam.

[0018] In some optional embodiments, there are five legs, an outer driving leg and an outer driven leg are respectively connected to the bottom of the longitudinal beam at intervals for running on the bridge deck, and two inner driving legs and an inner driven leg are connected to the bottom of another longitudinal beam for running on the prefabricated components.

[0019] In some optional embodiments, the two inner driving legs are respectively located on both sides of the inner driven leg, and the inner driven legs are foldable and retractable.

[0020] In some optional embodiments, the two hangers of each set of the sliding mechanisms are respectively located inside the projection of the top frame and outside the projection of the top frame.

[0021] In some optional embodiments, the top frame and the legs are connected via a structural reinforcement.

[0022] In some optional embodiments, the sliding mechanism is provided with two groups, and each group of the sliding mechanism is connected to two of the hangers at intervals, and the hangers can be extended and retracted in the Z direction relative to the sliding mechanism.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] Through the frame, continuous adjustment of all prefabricated components can be achieved. Through the cooperation of the sliding mechanism and the hanger, precise adjustment of a single prefabricated component in the X, Y and Z directions can be achieved. It not only has a high degree of automation, but also high adjustment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is a structural diagram of a bridge deck component installation and fine-tuning device according to the present invention;

[0027] Figure 2 for Figure 1 A side view schematic diagram of

[0028] Figure 3 for Figure 1 Schematic diagram of the front view.

[0029] In the figure: 1. Frame; 11. Top frame; 111. Crossbeam; 112. Longitudinal beam; 12. Support legs; 12a. Upper connecting structure; 12b. Lower running structure; 121. Outer driving leg; 122. Outer driven leg; 123. Inner driving leg; 124. Inner driven leg; 13. Structural reinforcement; 14. Connecting piece; 2. Hanger; 21. Telescopic part; 22. U-shaped lifting part; 3. Sliding mechanism; 31. Longitudinal shoulder pole beam; 32. Transverse shoulder pole beam; 33. Telescopic cylinder; 34. Slide rail; 4. Prefabricated component. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The following is a further detailed description of an embodiment of a bridge deck component installation fine-adjustment device according to the present invention in conjunction with the accompanying drawings.

[0032] like Figures 1 to 3 As shown, the present application provides a bridge deck component installation fine-tuning device, including a frame 1, a hanger 2 and a sliding mechanism 3. The frame 1 can move, the sliding mechanism 3 is slidably connected to the frame 1, and the hanger 2 is connected to the sliding mechanism 3 for hoisting prefabricated components 4. The hanger 2 is movably provided on the frame 1 through the sliding mechanism 3, and is used to move the prefabricated components 4 relative to the frame 1 along the X direction, the Y direction and the Z direction.

[0033] During use, the vehicle frame 1 travels across the bridge deck to the prefabricated component that requires fine adjustment. The prefabricated component 4 is then secured using the hanger 2. The sliding mechanism 3 cooperates with the hanger 2 to adjust the position of the prefabricated component 4 in the X, Y, and Z directions, thereby precisely adjusting the prefabricated component 4. After adjusting one prefabricated component, the hanger 2 is separated from the prefabricated component, and the vehicle frame 1 continues to travel to the next prefabricated component. The above operation is repeated until the positions of all prefabricated components are finely adjusted.

[0034] Therefore, through the frame 1, continuous adjustment of all prefabricated components can be achieved, and through the cooperation of the sliding mechanism 3 and the hanger 2, precise adjustment of a single prefabricated component in the X direction, Y direction and Z direction can be achieved, which not only has a high degree of automation but also high adjustment accuracy.

[0035] In this example, the hanger 2 is used to move the prefabricated component 4 in the Z direction, that is, to lift it vertically, and the sliding mechanism 3 is used to move the prefabricated component 4 in the X and Y directions, that is, to move it horizontally.

[0036] In some optional embodiments, the sliding mechanism 3 includes a longitudinal shoulder pole beam 31 and a transverse shoulder pole beam 32. The longitudinal shoulder pole beam 31 is slidably connected to the frame 1 and can slide in the X direction relative to the frame 1; the transverse shoulder pole beam 32 is slidably connected to the longitudinal shoulder pole beam 31 and can slide in the Y direction relative to the longitudinal shoulder pole beam 31. The hanger 2 is suspended below the transverse shoulder pole beam 32.

[0037] It is understood that the longitudinal shoulder beam 31 and the transverse shoulder beam 32 are both mounted on the top of the vehicle frame 1. The longitudinal shoulder beam 31 can slide on the vehicle frame 1 in the X direction, and the transverse shoulder beam 32 can slide on the longitudinal shoulder beam 31 in the Y direction. By adjusting the relative position of the longitudinal shoulder beam 31 with respect to the vehicle frame 1 in the X direction, and then adjusting the relative position of the transverse shoulder beam 32 with respect to the longitudinal shoulder beam 31 in the Y direction, the prefabricated component 4 can be moved in the X and Y directions.

[0038] In this example, the longitudinal shoulder beam 31 is provided with an avoidance hole opened along the Y direction for the end of the hanger 2 to pass through, so that the end of the hanger 2 can be connected to the transverse shoulder beam 32, and there is avoidance space when the transverse shoulder beam 32 moves.

[0039] In some optional embodiments, the above-mentioned frame 1 includes a top frame 11 and at least three support legs 12, and the above-mentioned sliding mechanism 3 is arranged on the above-mentioned top frame 11; at least three support legs 12 are respectively arranged at intervals and connected to the bottom of the above-mentioned top frame 11, for supporting the above-mentioned top frame 11 on the bridge deck.

[0040] It should be noted that when there are three legs 12, the line connecting the three legs 12 should form a triangle, preferably an isosceles triangle or an equilateral triangle. The purpose of this arrangement is to prevent the frame 1 from overturning when the sliding mechanism 3 moves on the top frame 11.

[0041] In this example, the top frame 11 and the legs 12 are both made of steel to enhance structural stability.

[0042] Of course, the more legs 12 there are, the better the support stability of the top frame 11, but the processing cost, weight, etc. of the device should also be considered. Therefore, there are preferably four legs 12, and the line connecting the four legs 12 is a rectangle.

[0043] In some optional embodiments, the top frame 11 includes two spaced-apart horizontal beams 111 and two longitudinal beams 112 connected at both ends of the two horizontal beams 111. The tops of the longitudinal beams 112 and the longitudinal shoulder beams 31 are provided with sliding rails 34, and the longitudinal shoulder beams 31 and the transverse shoulder beams 32 are provided with sliding parts that slide in cooperation with the sliding rails 34.

[0044] It can be understood that the top frame 11 is a rectangular frame, with the crossbeam 111 and the longitudinal beam 112 connected end to end. Slide rails 34 are provided on the tops of both longitudinal beams 112. The slide rails 34 are arranged along the X direction. Pulleys are provided at both ends of the bottom of the longitudinal shoulder beam 31 to slidably engage with the slide rails 34. As a result, the longitudinal shoulder beam 31 slides along the slide rails 34 to move along the X direction. Similarly, a slide rail 34 is also provided on the top of the longitudinal shoulder beam 31. The slide rail 34 is arranged along the Y direction. Pulleys are provided at the bottom of the transverse shoulder beam 32 to engage with the slide rail 34. The cooperation between the pulleys and the slide rails allows the transverse shoulder beam 32 to move along the Y direction on the longitudinal shoulder beam 31.

[0045] In other embodiments, a slide groove may be opened at the top of the longitudinal beam 112 and the top of the longitudinal shoulder beam 31, and a sliding member that slides with the slide groove may be set at the bottom of the longitudinal shoulder beam 31 and the bottom of the transverse shoulder beam 32.

[0046] In this example, the number of the legs 12 is five, namely, an outer driving leg 121 and an outer driven leg 122 , two inner driving legs 123 and an inner driven leg 124 .

[0047] Specifically, the outer driving leg 121 and the outer driven leg 122 are respectively connected to the bottom of the above-mentioned longitudinal beam 112 at intervals for running on the bridge deck, and the two inner driving legs 123 and one inner driven leg 124 are connected to the bottom of another above-mentioned longitudinal beam 112 for running on the above-mentioned prefabricated component 4.

[0048] It will be appreciated that to enable continuous operation and movement of the vehicle frame 1, at least a portion of the legs is drivable. The legs 12 include a connecting portion and rollers. The connecting portion is used to connect to the top frame, and the rollers can travel on the bridge deck and precast components. A drive motor is mounted on the rollers of the driving legs to drive the rollers.

[0049] If there are three outriggers, there should be at least two driving legs, one on the outside to run on the bridge deck and one on the inside to run on the precast components. If there are four outriggers, there should be at least two driving legs, and the two driving legs should be located at the two ends of the diagonal.

[0050] In some optional embodiments, the two inner driving legs 123 are respectively located on both sides of the inner driven leg 124, and the inner driven leg 124 is foldable and retractable.

[0051] It will be appreciated that during the fine-tuning process, the two inner driving legs 123 are supported on two adjacent precast members on either side of the precast member to be fine-tuned, while the inner follower legs 124 fold and contract to avoid affecting the displacement of the precast member to be fine-tuned. After the fine-tuning process is complete, the inner follower legs 124 unfold and travel over the fine-tuned precast member until they reach the next precast member to be fine-tuned, where they fold and contract again during the fine-tuning process.

[0052] In some optional embodiments, the inner driving legs 123 can also be folded and contracted.

[0053] The purpose of this arrangement is that when there is an obstacle on the prefabricated component that needs to be avoided, the obstacle can be avoided by sequentially retracting and folding the inner driving leg 123 and the inner driven leg 124. When one leg is retracted and folded, the remaining two legs can provide support and ensure that at least one driving leg is available to drive the movement.

[0054] In this example, the two inner driving legs 123 are respectively located on both sides of the inner driven leg 124 and are spaced apart. The two outer driving legs 121 and the two inner driving legs 123 are respectively located at the four corners of the rectangular top frame 11.

[0055] In some optional embodiments, the top frame 11 and the legs 12 are connected via a structural reinforcement 13 .

[0056] like Figure 2 As shown, one end of the structural reinforcement 13 is connected to the leg 12 , and the other end is connected to the cross beam 111 or the longitudinal beam 112 , thereby forming a triangular reinforcement structure.

[0057] In this example, a connecting member 14 is further provided between two adjacent legs 12 to enhance the structural stability between the legs 12 .

[0058] Optionally, the support legs 12 include an upper connecting structure 12a and a lower running structure 12b. The upper connecting structure 12a is connected to the top frame 11, and the lower running structure 12b is bolted to the upper connecting structure 12a. This allows for selecting a suitable lower running structure 12b according to the requirements of different construction scenarios. The height of the lower running structure 12b can also be adjusted to accommodate the hoisting of prefabricated components of different sizes. The above-mentioned connecting member 14 and structural reinforcement member 13 connected to both the upper connecting structure 12a and the top frame 11 are provided between the upper connecting structures 12a of two adjacent support legs 12, thereby forming a cubic frame structure. This arrangement is also intended to enhance the stability of the overall structure to accommodate the hoisting of heavier prefabricated components.

[0059] Of course, in other embodiments, the legs 12 may be retractable legs.

[0060] In some optional embodiments, the sliding mechanism 3 further includes a telescopic oil cylinder 33 , a fixed end of which is fixedly connected to the crossbeam 111 , and a telescopic end of which is connected to the longitudinal shoulder beam 31 .

[0061] It can be understood that the telescopic oil cylinder 33 is used to drive the longitudinally moving shoulder beam 31 to move in the X direction. Therefore, the displacement of the prefabricated component can be accurately controlled by controlling the elongation of the telescopic oil cylinder 33.

[0062] In some optional embodiments, the sliding mechanisms 3 are provided in two groups, and each group of the sliding mechanisms 3 is connected to two of the hangers 2 at intervals, and the hangers 2 can be extended and retracted in the Z direction relative to the sliding mechanisms 3 .

[0063] It is understood that there are four hangers 2 in total, so that the prefabricated components can be hoisted more stably to prevent them from falling off during fine adjustment. The four hangers are respectively arranged on the two sliding mechanisms 3 in pairs.

[0064] Preferably, the two hangers 2 on each sliding mechanism 3 are slidably connected to the transverse shoulder beam 32, so as to adjust the spacing between the two hangers 2 to accommodate prefabricated components with different widths in the Y direction.

[0065] Because each sliding mechanism 3 is moved on the longitudinal shoulder beam 31 by a telescopic cylinder 33, the spacing between the sliding mechanisms 3 can be adjusted by adjusting the different telescopic lengths of the two telescopic cylinders 33 to accommodate precast components of different lengths in the X direction. When fine-tuning the precast component 4, one telescopic cylinder 33 is extended while the other telescopic cylinder 33 is simultaneously shortened.

[0066] In some optional embodiments, the above-mentioned hanger 2 includes a telescopic part 21 and a U-shaped lifting part 22. One end of the telescopic part 21 is connected to the transverse shoulder beam 32, and the other end is connected to the U-shaped lifting part 22. The U-shaped lifting part 22 is detachably connected to the prefabricated component 4 through a pin.

[0067] In some optional embodiments, the two hangers 2 of each set of the sliding mechanisms 3 are respectively located inside the projection of the top frame 11 and outside the projection of the top frame 11 .

[0068] The purpose of this arrangement is that the outer legs run on the bridge deck, and the inner legs run on the prefabricated component 4. Therefore, when the prefabricated component 4 is hoisted, part of the prefabricated component 4 is located within the projection of the top frame 11, and part is located outside the projection of the top frame 11.

[0069] The operating principle of the embodiment of the present application is as follows: the vehicle frame 1 is moved on the bridge deck to the prefabricated component requiring fine adjustment. At this point, the outer driving leg 121 and the outer driven leg 122 are supported on the bridge deck, the two inner driving legs 123 are supported on the prefabricated component that has been fine-tuned and the prefabricated component that has not yet been fine-tuned, respectively, and the inner driven leg 124 is supported on the prefabricated component to be fine-tuned. The U-shaped suspension portions 22 of the four hangers 2 are connected to the prefabricated component 4 via latches, and the inner driven legs 124 are folded and retracted. The telescopic portions 21 of the four hangers 2 are retracted to suspend the prefabricated component 4 to be fine-tuned. The telescopic cylinder 33 then adjusts the longitudinal shoulder beam 31 to move the prefabricated component 4 in the X direction, and the transverse shoulder beam 32 is adjusted to move the prefabricated component 4 in the Y direction. Once the component is precisely positioned, the telescopic portion 21 of the hanger 2 is extended to place the prefabricated component 4 in the precise position. Repeat the above steps until all prefabricated components are fine-tuned.

[0070] The utility model provides a bridge deck component installation fine-adjustment device. Through the vehicle frame 1, continuous adjustment of all prefabricated components can be achieved. Through the cooperation of the sliding mechanism 3 and the hanger 2, precise adjustment of a single prefabricated component in the X, Y and Z directions can be achieved. It not only has a high degree of automation but also has high adjustment accuracy. By adjusting the relative position of the longitudinal shoulder beam 31 relative to the vehicle frame 1 in the X direction, and then adjusting the relative position of the transverse shoulder beam 32 relative to the longitudinal shoulder beam 31 in the Y direction, the prefabricated component 4 is moved in the X and Y directions. The inner driven leg 124 can be folded and retracted to avoid affecting the displacement of the prefabricated component to be fine-adjusted. By providing a telescopic oil cylinder and controlling the elongation of the telescopic oil cylinder 33, the displacement of the prefabricated component can be precisely controlled, thereby improving the adjustment accuracy.

[0071] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0072] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0073] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A bridge deck component installation and fine-tuning device, characterized in that: include: A movable frame (1); A hanger (2) is used for hanging a prefabricated component (4); the hanger (2) is movably arranged on the vehicle frame (1) via a sliding mechanism (3) and is used for moving the prefabricated component (4) relative to the vehicle frame (1) along the X direction, the Y direction and the Z direction.

2. The bridge deck component installation fine-tuning device according to claim 1, characterized in that: The sliding mechanism (3) comprises: A longitudinally movable shoulder beam (31) is slidably connected to the vehicle frame (1) and is slidable relative to the vehicle frame (1) in the X direction; The transverse shoulder pole beam (32) is slidably connected to the longitudinal shoulder pole beam (31) and can slide in the Y direction relative to the longitudinal shoulder pole beam (31). The hanger (2) is suspended below the transverse shoulder pole beam (32).

3. The bridge deck component installation fine-tuning device according to claim 2, characterized in that: The vehicle frame (1) comprises: A top frame (11), wherein the sliding mechanism (3) is arranged on the top frame (11); At least three legs (12) are respectively arranged at intervals and connected to the bottom of the top frame (11) for supporting the top frame (11) on the bridge deck.

4. The bridge deck component installation fine-tuning device according to claim 3, characterized in that: The top frame (11) includes two spaced-apart cross beams (111) and two longitudinal beams (112) connected to the two ends of the two cross beams (111). The tops of the longitudinal beams (112) and the longitudinal shoulder beam (31) are both provided with slide rails (34). The longitudinal shoulder beam (31) and the transverse shoulder beam (32) are both provided with sliding members that slide in cooperation with the slide rails (34).

5. The bridge deck component installation fine-tuning device according to claim 4, characterized in that: The sliding mechanism (3) further comprises a telescopic oil cylinder (33), a fixed end of which is fixedly connected to the crossbeam (111), and a telescopic end of which is connected to the longitudinally moving shoulder beam (31).

6. The bridge deck component installation fine-tuning device according to claim 4, characterized in that: The supporting legs (12) are provided with five, an outer driving leg (121) and an outer driven leg (122) are respectively connected to the bottom of the longitudinal beam (112) at intervals and used for running on the bridge deck, and two inner driving legs (123) and an inner driven leg (124) are connected to the bottom of another longitudinal beam (112) and used for running on the prefabricated component (4).

7. The bridge deck component installation fine-tuning device according to claim 6, characterized in that: The two inner driving legs (123) are respectively located on both sides of the inner driven leg (124), and the inner driven leg (124) can be folded and contracted.

8. The bridge deck component installation fine-tuning device according to claim 3, characterized in that: The two hangers (2) of each set of the sliding mechanism (3) are respectively located inside the projection of the top frame (11) and outside the projection of the top frame (11).

9. The bridge deck component installation fine-tuning device according to claim 3, characterized in that: The top frame (11) and the supporting legs (12) are connected via a structural reinforcement (13).

10. The bridge deck component installation fine-tuning device according to claim 1, characterized in that: The sliding mechanism (3) is provided with two groups, and two hangers (2) are connected to each group of the sliding mechanism (3) at intervals, and the hangers (2) can be extended and retracted in the Z direction relative to the sliding mechanism (3).

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