A guiding and positioning device and method for high-precision vertical coordinate boring machine

Abstract

This invention discloses a guiding and positioning device and method for a high-precision vertical coordinate boring machine, comprising a double-ended screw, an upper support plate, and a lower support plate. The double-ended screw includes a left double-ended screw and a right double-ended screw. Both the upper and lower support plates are provided with a U-shaped groove and a circular groove. The left and right double-ended screws are respectively installed in the circular groove and U-shaped groove of the upper and lower support plates. A replaceable open-end sleeve is provided at the uppermost end of both the left and right double-ended screws. This invention, by threading the guiding and positioning device onto the bed of the vertical coordinate boring machine, serves a guiding and positioning function, preventing hole drift and slant during hole reaming and boring processes. The openings in the open-end sleeve and the U-shaped groove allow for quick replacement of the open-end sleeve and the sleeve, ensuring the positioning accuracy and repeatability of the high-precision vertical coordinate boring machine.

Description

Technical Field

[0001] This invention relates to the field of high-precision vertical coordinate boring machine technology, and specifically to a guiding and positioning device and method for a high-precision vertical coordinate boring machine. Background Technology

[0002] To ensure the high precision of the vertical coordinate boring machine, achieving a positioning accuracy of 0.0025mm and a repeatability of 0.0012mm during linear motion of the X, Y, and Z axes, the machine components employ a tapered pin positioning system. This ensures a tight connection between the left and right columns and the bed, guaranteeing precise positioning of the columns and bed. This prevents displacement between the columns and bed during operation, which could lead to reduced accuracy or even machine failure. After the entire machine passes geometric accuracy assembly inspection, two φ50 tapered holes are drilled at the joints between the left and right columns and the bed. The tapered pins and pin holes are inspected with color coating, ensuring a contact area of ​​at least 80% along the working length and uniform contact before the φ50×160 tapered pins are installed for positioning.

[0003] If the pin hole is machined, the entire vertical coordinate boring machine must first be hoisted. During hoisting, the left and right columns and the bed will shift, affecting the overall accuracy of the machine. Secondly, the high cutting force and stress during machining will also affect the overall accuracy of the machine. Furthermore, the contact requirements between the tapered pin and the tapered hole are quite high, which is difficult to achieve through machining. The φ50×160 tapered hole has a large diameter and a deep mating length, while the effective stroke of a manual wrench is only 70mm. The position needs to be adjusted every 50mm or so to achieve the machining of the tapered hole. Traditional methods of making pin holes cannot achieve rapid position adjustment and stable positioning.

[0004] Therefore, there is an urgent need to design a coordinate boring machine guide and positioning device and positioning method that can quickly adjust the position of the manual drill bit. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a guiding and positioning device and method for a high-precision vertical coordinate boring machine. This guiding and positioning device is mounted on the bed of the vertical coordinate boring machine and fitted with tapered holes at the junction of the left and right columns and the bed. This allows for quicker replacement of gaskets and open gaskets, while ensuring the stability of the device during replacement, thereby further improving the positioning accuracy and repeatability of the high-precision vertical coordinate boring machine.

[0006] The technical solution of the present invention is as follows:

[0007] This invention discloses a guiding and positioning device for a high-precision vertical coordinate boring machine, comprising a double-ended screw, an upper support plate, and a lower support plate. The double-ended screw includes a left double-ended screw and a right double-ended screw. Both the upper and lower support plates are provided with a U-shaped groove and a circular groove. The left and right double-ended screws are respectively installed in the circular groove and the U-shaped groove of the upper and lower support plates. An open-end sleeve is provided at the uppermost end of the left double-ended screw. The open-end sleeve can be directly replaced from the side of the left double-ended screw through the opening 101. A sleeve is provided at the uppermost end of the right double-ended screw. After rotating the upper and lower support plates, the right double-ended screw is disengaged from the U-shaped groove, allowing the sleeve to be replaced. The uppermost ends of the open-end sleeve and the sleeve are in contact with the lower end of the upper support plate.

[0008] The above structure, by embedding the right double-ended screw into the U-shaped groove, facilitates the replacement of the washer on the right double-ended screw. The left double-ended screw, on the other hand, uses an open washer, which can be quickly removed and replaced. The use of an open washer on the left and a washer on the right double-ended screw is to further ensure the stability of the entire device. Using open washers for both could make it difficult to secure during use; therefore, the right double-ended screw uses a washer in conjunction with the U-shaped groove for quick replacement. Furthermore, the U-shaped groove design facilitates the rotation of the upper and lower support plates, making it easy to install the central manual drill bit.

[0009] Furthermore, the open gasket includes four cylinders with the same diameter and openings, and their heights decrease by 50mm sequentially; the gasket includes four cylinders with the same diameter and their heights decrease by 50mm sequentially; the open gasket and the gasket installed on the double-ended screw at the same time have the same height; the distance between the two ends of the opening of the open gasket is greater than the outer diameter of the double-ended screw.

[0010] The above structure, due to the limited effective stroke of the manual wrench (70mm), requires replacing the bushing and open bushing approximately every 50mm of reaming to achieve the tapered hole machining. Therefore, multiple open bushings and bushings with progressively decreasing heights of 50mm are needed. At the same time, the height of the open bushings and bushings used must be the same, and the next replacement will always be with open bushings and bushings of 50mm reduced height. This ensures that the height of the open bushings and bushings on both the left and right studs is always the same, improving positioning accuracy. The distance between the two openings of the open bushing is greater than the outer diameter of the stud, ensuring that the open bushing can be fitted onto the stud from the side and quickly removed from the side.

[0011] Furthermore, the upper support plate is provided with a first annular groove, a first through hole and a first U-shaped groove, the upper end of the left double-ended screw passes through the first annular groove and the upper end of the right double-ended screw passes through the first U-shaped groove; the lower support plate is provided with a second annular groove, a second through hole and a second U-shaped groove, the lower end of the left double-ended screw passes through the second annular groove and the lower end of the right double-ended screw passes through the second U-shaped groove.

[0012] Furthermore, washers and hexagonal nuts are provided on the first annular groove and the first U-shaped groove of the upper support plate. The washers are fitted onto the double-ended screw, and the hexagonal nuts can be moved up and down to adjust their position through the threads on the double-ended screw.

[0013] Furthermore, a connecting rod is provided between the left double-ended screw and the right double-ended screw. The connecting rod is movably installed in the second through hole of the lower support plate through a bushing. The outer circle of the bushing contacts the second through hole on the lower support plate, the shoulder surface of the bushing contacts the upper surface of the lower support plate, and the outer circle of the connecting rod contacts the gap between the inner hole of the bushing. The upper end of the connecting rod is connected to a manual wrench, and the lower end of the connecting rod is connected to a reamer or a hole reamer.

[0014] Furthermore, a top head is installed at the lower end of the first through hole of the upper support plate, the shoulder surface of the top head contacts the lower end surface of the upper support plate, and the lower end of the top head contacts a manual wrench.

[0015] Furthermore, a long washer is installed on the double-ended screw, and a short washer is installed on the long washer. The upper end of the short washer contacts the lower end face of the lower support plate. A fixed washer is installed on the short washer, and the lower end of the fixed washer contacts the upper end face of the lower support plate.

[0016] This invention also discloses a guiding and positioning method for a high-precision vertical coordinate boring machine, comprising: connecting the double-ended screw in the positioning device to the bed of the vertical coordinate boring machine via a threaded connection; the lower end face of the long pad contacting the right column or the through-hole shoulder of the right column of the vertical coordinate boring machine; installing a manual wrench on the upper end of the connecting rod in the positioning device, and installing a reamer on the lower end of the connecting rod; rotating the manual wrench to drive the connecting rod to rotate and move downward in a straight line, thereby driving the reamer to ream the hole; replacing the pad and the open pad every 50mm of downward reaming by the manual wrench.

[0017] Further, the specific operation method for replacing the gasket and the open gasket is as follows: Loosen the left hex nut, remove the right washer and hex nut, directly rotate the lower support plate and the upper support plate to disengage the right double-ended screw from the U-shaped groove opening, then remove the gasket from the right double-ended screw, replace it with a gasket with a height reduced by 50mm and install it on the right double-ended screw, then install the right washer and hex nut on the right double-ended screw; after loosening the hex nut, directly remove the open gasket installed on the left double-ended screw from the side, replace it with an open gasket with a height reduced by 50mm and insert it into the left double-ended screw from the side, rotate the lower support plate and the upper support plate again and install them on the right double-ended screw, tighten the hex nuts on both sides, and secure the upper support plate, gasket and open gasket together.

[0018] Furthermore, the specific operation method for disassembling and installing the manual wrench is as follows: loosen the left hex nut, remove the right washer and hex nut, directly rotate the lower support plate and the upper support plate to disengage the right double-ended screw from the U-shaped groove opening, then install the manual wrench at the lower end of the connecting rod. After installation, rotate the lower support plate and the upper support plate again to install them on the right double-ended screw, tighten the hex nuts on both sides, and bring the lower end of the top head on the upper support plate into contact with the manual wrench.

[0019] Compared with existing technologies, the advantages of this invention are:

[0020] 1. This invention uses an open-end sleeve on the left double-ended screw and a sleeve on the right double-ended screw, and sets a U-shaped groove at the installation position of the upper and lower support plates where the right double-ended screw is located, which facilitates the quick replacement of the open-end sleeves and sleeves on both sides, as well as the installation of the middle manual wrench.

[0021] 2. This invention aims to ensure the positioning accuracy and repeatability of a high-precision vertical coordinate boring machine. A guiding positioning device is threadedly connected to the machine bed, serving as a guide and preventing hole drift and slant during reaming and boring processes, thus ensuring the high precision requirements of the vertical coordinate boring machine. Rotating the manual drill bit causes the connecting rod to rotate and move downwards in a linear motion, driving the reamer to rotate and move downwards in a linear motion. The reamer can be replaced with a reamer to create a tapered hole, depending on the actual usage requirements. Replacing the upper and lower support plates allows for the creation of tapered holes at the junction of the left and right columns and the machine bed of different specifications and models of vertical coordinate boring machines, and has been widely applied. This invention is rationally designed, simple in structure, easy to use, and safe, simple, convenient, and quick to operate, effectively guaranteeing the positioning accuracy and repeatability requirements of a high-precision vertical coordinate boring machine. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2This is a schematic diagram of the lower support plate structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the upper support plate mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram of the open gasket structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the gasket structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure in use of the present invention;

[0028] Reference numerals: 1-Double-ended screw, 2-Long washer, 3-Short washer, 4-Lower support plate, 5-Fixed washer, 6-Wearing washer, 7-First annular groove, 8-First through hole, 9-First U-shaped groove, 10-Open washer, 101-Opening, 11-Second annular groove, 12-Second through hole, 13-Second U-shaped groove, 14-Bushing, 15-Connecting rod, 16-Upper support plate, 17-Top head, 18-Washer, 19-Hex nut, 20-Manual drill bit, 21-Reamer, A-Guiding and positioning device, B-Right column, C-Left column, D-Bed. Detailed Implementation

[0029] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] The technical solution of the present invention will be further described in detail below with reference to the embodiments.

[0031] like Figure 1 and Figure 6As shown, this invention discloses a guiding and positioning device for a high-precision vertical coordinate boring machine. The guiding and positioning device A includes a double-ended screw 1. During use, the double-ended screw 1 is threadedly connected to the bed D of the vertical coordinate boring machine and mates with the through hole of the left column C or right column B of the vertical coordinate boring machine. A long washer 2 is provided on the double-ended screw 1 of the guiding and positioning device A. The lower end face of the long washer 2 contacts the shoulder surface of the through hole of the left column C or right column B of the vertical coordinate boring machine. The upper end face of the long washer 2 contacts the surface of a short washer 3. The short washer 3 contacts the lower end face of the lower support plate 4. A fixed washer 5 is installed above the short washer 3. The lower end of the fixed washer 5 contacts the upper end face of the lower support plate 4, and the upper end face of the fixed washer 5 contacts the lower end faces of washer 6 and open washer 10. The outer circle of the bushing 14 mates with the second through hole 12 of the lower support plate 4, and the shoulder surface of the bushing 14 contacts the upper end face of the lower support plate 4. The bushing 14 is in contact with the connecting rod 15, which is inserted into the bushing 14. The outer circle of the connecting rod 15 is in clearance fit with the inner hole of the bushing 14. The upper end of the connecting rod 15 is connected to the manual drill 20, and the lower end of the connecting rod 15 is connected to the reamer 21. The outer circle of the top head 17 is in interference fit with the inner hole of the upper support plate 16. The shoulder surface of the top head 17 is in contact with the surface of the upper support plate 16, and the lower end of the top head 17 is in contact with the manual drill 20. The upper support plate 16 is in contact with the upper end face of the pad 6 and the open pad 10. The pad 6 and the open pad 10 are pressed down by the washer 18 and the hexagonal nut 19 on the double-ended screw 1 at the upper end of the upper support plate 16.

[0032] The double-ended screw 1 includes a left double-ended screw and a right double-ended screw. Both the upper support plate 16 and the lower support plate 4 are provided with a U-shaped waist groove and a circular waist groove. The left double-ended screw and the right double-ended screw are respectively installed in the circular waist groove and the U-shaped waist groove of the upper support plate 16 and the lower support plate 4. The uppermost end of the left double-ended screw is provided with a replaceable open washer 10, and the uppermost end of the right double-ended screw is provided with a replaceable washer 6. The uppermost ends of the open washer 10 and the washer 6 are in contact with the lower end of the upper support plate 16, respectively.

[0033] like Figure 4 As shown, the open gasket 10 comprises four cylinders with the same diameter and openings, whose heights decrease by 50 mm sequentially; Figure 5 As shown, the sleeve 6 includes four cylinders with the same diameter, and the height decreases by 50mm in sequence; the open sleeve 10 and the sleeve 6 installed on the double-ended screw at the same time have the same height; the distance between the two ends of the opening of the open sleeve 10 is greater than the outer diameter of the double-ended screw; the upper end face of the fixed sleeve on the left double-ended screw is in contact with the open sleeve, and the upper end face of the fixed sleeve on the right double-ended screw is in contact with the sleeve.

[0034] like Figure 2 and Figure 3As shown, the upper support plate 16 is provided with a first annular groove 7, a first through hole 8, and a first U-shaped groove 9. The upper end of the left double-ended screw passes through the first annular groove 7, and the upper end of the right double-ended screw passes through the first U-shaped groove 9. The lower support plate 4 is provided with a second annular groove 11, a second through hole 12, and a second U-shaped groove 13. The lower end of the left double-ended screw passes through the second annular groove 11, and the lower end of the right double-ended screw passes through the second U-shaped groove 13. Washers 18 and hexagonal nuts 19 are provided on the first annular groove 7 and the first U-shaped groove 9 of the upper support plate 16. Washers 18 are fitted on the double-ended screw 1, and hexagonal nuts 19 can be moved up and down to adjust their position through the threads on the double-ended screw 1.

[0035] This invention also discloses a guiding and positioning method for a high-precision vertical coordinate boring machine, specifically including: connecting the double-ended screw 1 in the positioning device A to the bed D of the vertical coordinate boring machine via a thread; the lower end face of the long pad 2 contacts the through-hole shoulder face of the right column B or right column C of the vertical coordinate boring machine; installing a manual wrench 20 on the upper end of the connecting rod 15 in the positioning device A; installing a reamer 21 (reamer) on the lower end of the connecting rod 15; rotating the manual wrench 20 causes the connecting rod 15 to rotate and move downward in a straight line, thereby driving the reamer 21 (reamer) to ream the hole; replacing the pad and the open pad every 50mm of downward reaming by the manual wrench 20.

[0036] Since the effective stroke of a manual wrench is only 70mm, the pad and the open pad need to be replaced every 50mm or so to achieve the processing of the tapered hole. Therefore, this invention is provided with multiple open pads and pads, each with a height that decreases by 50mm, and the open pads and pads installed on the double-ended screw 1 at the same time have the same height.

[0037] To replace the gasket and the open gasket, simply loosen the left hex nut 19, remove the right washer 18 and hex nut 19. Due to the design of the first U-shaped groove 9 and the second U-shaped groove 13 on the lower support plate 4 and the upper support plate 16, the lower support plate 4 and the upper support plate 16 can be directly rotated to disengage the right double-ended screw from the U-shaped groove opening. Then, remove the gasket 6 from the right double-ended screw 1, replace it with a gasket 6 that is 50mm shorter, and install it on the right double-ended screw 1. Finally, install the washer 18 and hex nut 19 on the right double-ended screw 1. Because of the open... The sleeve 10 is a cylinder with an opening 101, and the distance between the two ends of the opening 101 is greater than the outer diameter of the double-ended screw. Therefore, after loosening the hexagonal nut 19, the open sleeve 10 mounted on the left double-ended screw 1 can be directly removed from the side. Similarly, replace it with the next open sleeve 10 with a height reduced by 50mm and insert it into the left double-ended screw 1 from the side. Rotate the lower support plate 4 and the upper support plate 16 again to mount them on the right double-ended screw 1. Tighten the washers 18 and hexagonal nuts 19 on both sides to secure the upper support plate 16 to the sleeve 6 and the open sleeve 10. The next reaming (expansion) can then be performed. Replace the sleeves and open sleeves of the same height in sequence to achieve the matching of the tapered hole.

[0038] The installation of the manual wrench 20 is similar: remove the right-side washer 18 and hexagonal nut 19, directly rotate the lower support plate 4 and upper support plate 16 to disengage the right-side double-ended screw from the U-shaped groove opening, then install the manual wrench 20 on the connecting rod 15, rotate the lower support plate 4 and upper support plate 16 again to install them on the right-side double-ended screw, tighten the hexagonal nuts 19 on both sides, and bring the lower end of the top head 17 on the upper support plate 16 into contact with the manual wrench 20. The connecting rod 15 is located inside the bushing 14. Rotating the manual wrench 20 causes the connecting rod 15 to rotate within the bushing 14 and move downward in a straight line, thereby driving the reamer 21 (reamer) to perform pin hole fitting.

[0039] The specific embodiments described in this application are quite detailed, but they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A guiding and positioning device for a high-precision vertical coordinate boring machine, characterized in that, The system includes a double-ended screw (1), an upper support plate (16), and a lower support plate (4). The double-ended screw (1) includes a left double-ended screw and a right double-ended screw. Both the upper support plate (16) and the lower support plate (4) are provided with U-shaped waist grooves and annular waist grooves. The left double-ended screw and the right double-ended screw are respectively installed in the annular waist groove and the U-shaped waist groove of the upper support plate (16) and the lower support plate (4). The uppermost end of the left double-ended screw is provided with an open washer (10). The open washer (10) can be directly replaced from the side of the left double-ended screw through the opening (101). The uppermost end of the right double-ended screw is provided with a washer (6). When the upper support plate (16) and the lower support plate (4) are rotated, the right double-ended screw disengages from the U-shaped waist groove. After the shaped waist groove, the pads are replaced; the uppermost ends of the open pads (10) and pads (6) are in contact with the lower end of the upper support plate (16); the open pads (10) include four cylinders with the same diameter and openings (101), and the height decreases by 50mm in sequence; the pads (6) include four cylinders with the same diameter, and the height decreases by 50mm in sequence; the open pads (10) and pads (6) installed on the double-ended screw at the same time have the same height; the distance between the two ends of the opening (101) of the open pads (10) is greater than The outer diameter of the double-ended screw; a connecting rod (15) is provided between the left double-ended screw and the right double-ended screw. The connecting rod (15) is movably installed in the second through hole (12) of the lower support plate (4) through the bushing (14). The outer circle of the bushing (14) contacts the second through hole (12) on the lower support plate (4). The shoulder surface of the bushing (14) contacts the upper end surface of the lower support plate (4). The outer circle of the connecting rod (15) contacts the gap between the inner hole of the bushing (14). The upper end of the connecting rod (15) is connected to a manual wrench (20), and the lower end of the connecting rod (15) is connected to a reamer (21).

2. The guiding and positioning device for a high-precision vertical coordinate boring machine according to claim 1, characterized in that, The upper support plate (16) is provided with a first annular groove (7), a first through hole (8) and a first U-shaped groove (9). The upper end of the left double-headed screw passes through the first annular groove (7) and the upper end of the right double-headed screw passes through the first U-shaped groove (9). The lower support plate (4) is provided with a second annular groove (11), a second through hole (12) and a second U-shaped groove (13). The lower end of the left double-headed screw passes through the second annular groove (11) and the lower end of the right double-headed screw passes through the second U-shaped groove (13).

3. A guiding and positioning device for a high-precision vertical coordinate boring machine according to claim 2, characterized in that, Washers (18) and hexagonal nuts (19) are provided on the first annular groove (7) and the first U-shaped groove (9) of the upper support plate (16). The washers (18) are fitted on the double-ended screw (1), and the hexagonal nuts (19) can be moved up and down to adjust their position through the threads on the double-ended screw (1).

4. The guiding and positioning device for a high-precision vertical coordinate boring machine according to claim 1, characterized in that, A top head (17) is installed at the lower end of the first through hole (8) of the upper support plate (16). The shoulder surface of the top head (17) is in contact with the lower end surface of the upper support plate (16), and the lower end of the top head (17) is in contact with the manual wrench (20).

5. A guiding and positioning device for a high-precision vertical coordinate boring machine according to claim 1, characterized in that, The double-ended screw (1) is equipped with a long washer (2), and a short washer (3) is installed on the long washer (2). The upper end of the short washer (3) is in contact with the lower end face of the lower support plate (4). A fixed washer (5) is installed on the short washer (3), and the lower end of the fixed washer (5) is in contact with the upper end face of the lower support plate (4).

6. A guiding and positioning method for a high-precision vertical coordinate boring machine, characterized in that, The guide positioning device for a high-precision vertical coordinate boring machine according to claim 5 includes: connecting the double-headed screw (1) in the guide positioning device (A) to the bed (D) of the vertical coordinate boring machine via a threaded connection; the lower end face of the long pad (2) contacts the through-hole shoulder face of the right column (B) or right column (C) of the vertical coordinate boring machine; installing a manual wrench (20) on the upper end of the connecting rod (15) in the guide positioning device (A); installing a reamer (21) on the lower end of the connecting rod (15); rotating the manual wrench (20) causes the connecting rod (15) to rotate and move downward in a straight line, thereby driving the reamer (21) to ream the hole; and replacing the pad and the open pad every 50mm of downward reaming by the manual wrench (20).

7. A guiding and positioning method for a high-precision vertical coordinate boring machine according to claim 6, characterized in that, The specific operation method for replacing the gasket and the open gasket is as follows: Loosen the left hex nut (19), remove the right washer (18) and hex nut (19), directly rotate the lower support plate (4) and the upper support plate (16) to disengage the right double-ended screw from the U-shaped groove opening, then remove the gasket (6) from the right double-ended screw, replace it with a gasket (6) with a height reduced by 50mm and install it on the right double-ended screw, and then remove the right washer (18) and hex nut (19). Install the hexagonal nut (19) on the right double-ended screw; after loosening the hexagonal nut (19), directly remove the open gasket (10) installed on the left double-ended screw from the side, replace it with an open gasket (10) with a height reduced by 50mm and insert it into the left double-ended screw from the side, rotate the lower support plate (4) and the upper support plate (16) again and install them on the right double-ended screw, tighten the hexagonal nuts (19) on both sides, and fasten the upper support plate (16) together with the gasket (6) and the open gasket (10).

8. A guiding and positioning method for a high-precision vertical coordinate boring machine according to claim 6, characterized in that, The specific operation method for disassembling and installing the manual wrench (20) is as follows: loosen the left hexagonal nut (19), remove the right washer (18) and hexagonal nut (19), directly rotate the lower support plate (4) and the upper support plate (16) to disengage the right double-ended screw from the U-shaped groove opening, and then install the manual wrench (20) at the lower end of the connecting rod (15). After installation, rotate the lower support plate (4) and the upper support plate (16) again to install on the right double-ended screw, tighten the hexagonal nuts (19) on both sides, and bring the lower end of the top head (17) on the upper support plate (16) into contact with the manual wrench (20).

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