Horizontal deep hole machining equipment

Abstract

The utility model relates to horizontal type deep hole machining equipment, which belongs to the technical field of mechanical manufacturing, and comprises a lathe bed and a punching device, an X-axis moving device is arranged on the lathe bed, a tool clamp is arranged on the X-axis moving device, and the tool clamp comprises an X-axis positioning mechanism, a Y-axis positioning mechanism and a clamping mechanism. The Y-axis positioning mechanism is used for placing a workpiece and limiting movement of the workpiece on the Y axis, the X-axis positioning mechanism is used for limiting movement of one end of the workpiece on the Y axis, the clamping mechanism is used for clamping the workpiece on the Y-axis positioning mechanism, the punching device comprises a Z-axis moving device, and punching equipment is arranged on the Z-axis moving device so that the punching equipment can move on the Z axis. The projection of the center line of the punching device coincides with the center line of the workpiece in the horizontal plane. Therefore, the situation that the workpiece moves or deviates due to thrust generated by the punching equipment can be avoided, and then it is guaranteed that the equipment has enough precision when deep hole machining is conducted on workpieces of different types.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, specifically a horizontal deep hole processing equipment. Background Technology

[0002] With the continuous development of precision in tool parts, the demand for deep hole machining is increasing. Deep holes generally refer to holes with a length-to-diameter ratio greater than 5.

[0003] In traditional deep hole drilling, the high spindle speed and feed rate of the machining center can easily cause the workpiece to vibrate and shift, resulting in a reduction in machining accuracy.

[0004] Therefore, it is necessary to improve the existing horizontal deep hole machining equipment. Utility Model Content

[0005] In order to solve the problems in related technologies, this utility model provides a horizontal deep hole machining equipment, which solves the problem of low machining accuracy in existing equipment.

[0006] To solve the above problems, the following technical solutions are provided:

[0007] This utility model discloses a horizontal deep hole machining equipment, including a bed and a drilling device. The bed is equipped with an X-axis moving device, and the X-axis moving device is equipped with a tooling fixture. The tooling fixture includes an X-axis positioning mechanism, a Y-axis positioning mechanism, and a clamping mechanism. The Y-axis positioning mechanism is used to place the workpiece and limit the movement of the workpiece on the Y-axis. The X-axis positioning mechanism is used to limit the movement of one end of the workpiece on the Y-axis. The clamping mechanism is used to clamp the workpiece on the Y-axis positioning mechanism. The drilling device includes a Z-axis moving device, and the Z-axis moving device is equipped with a drilling device so that the drilling device can move on the Z-axis. The projection of the center line of the drilling device coincides with the center line of the workpiece in the horizontal plane.

[0008] The X-axis moving device in the above scheme includes an X-axis positioning mechanism, a Y-axis positioning mechanism, and a clamping mechanism. The Y-axis positioning mechanism positions the workpiece relative to the centerline of the drilling equipment, while the X-axis positioning mechanism restricts the workpiece's freedom of movement along the X-axis. The clamping mechanism then fixes the workpiece to the Y-axis positioning mechanism. The Y-axis positioning mechanism ensures that the workpiece and the drilling equipment's projections in the longitudinal plane coincide, preventing workpiece offset in the Y-axis direction. Simultaneously, the Z-axis moving device moves the drilling equipment so that its centerline coincides with the workpiece's centerline, thus ensuring the accuracy of deep hole machining. When the workpiece is changed, the workpiece's centerline and the drilling equipment's centerline will offset in the Z-axis direction. The Z-axis moving device adjusts the height of the drilling equipment to again ensure that the drilling equipment's centerline coincides with the workpiece's centerline. Furthermore, during workpiece feeding, the X-axis positioning mechanism, Y-axis positioning mechanism, and clamping mechanism prevent workpiece movement or offset caused by the thrust generated by the drilling equipment, thereby ensuring sufficient accuracy for deep hole machining of different types of workpieces.

[0009] The Y-axis positioning mechanism includes a V-shaped seat fixed on the X-axis guide seat, and the X-axis positioning mechanism includes an X-axis baffle. The X-axis baffle is fixed at one end of the X-axis guide seat and is used to abut against the end of the workpiece away from the drilling device.

[0010] In the above scheme, the openings of the V-shaped seats are connected in series along the X-axis, that is, the projections of all the openings of the V-shaped seats on the YZ plane coincide, so that the V-shaped seats have the function of restricting the workpiece in the Y-axis direction. The X-axis baffle is used to hold one end of the workpiece to prevent the workpiece from axial displacement.

[0011] The X-axis moving device includes a first drive mechanism and an X-axis guide rail arranged along the X-axis on the upper surface of the bed. An X-axis guide seat is slidably connected to the X-axis guide rail. The first drive mechanism is used to drive the X-axis guide seat to move along the X-axis guide rail. The Z-axis moving device includes a second drive mechanism and a side plate fixedly connected to the bed. A Z-axis guide rail is provided on one side of the side plate. A Z-axis guide seat is slidably connected to the Z-axis guide rail. The second drive mechanism is used to drive the Z-axis guide seat to move along the Z-axis guide rail. The drilling device is fixed on the Z-axis guide seat.

[0012] In the above scheme, the first driving mechanism drives the X-axis guide to move along the X-axis guide rail, thereby adjusting the position of the workpiece, and the second driving mechanism drives the Z-axis guide to move along the Z-axis guide rail, thereby adjusting the height of the drilling equipment and cooperating with the workpiece to complete the deep hole machining.

[0013] The clamping mechanism includes a first bracket and a second bracket. The bottom end of the first bracket is fixedly connected to the X-axis guide seat. The second bracket has an L-shaped structure. One vertical arm of the second bracket is hinged to the top end of the first bracket. A first telescopic device is installed on the other horizontal arm. A second telescopic device is hinged to the side of the first bracket. The moving end of the first telescopic device faces the bed and a clamping block is fixedly connected to that end. The clamping block is located above the V-shaped seat, and the end of the clamping block facing the V-shaped seat is a concave arc, V-shaped, or U-shaped groove. The telescopic device drives the clamping block along the Z-axis to press the workpiece against the V-shaped seat. A first pull rod is also hinged to the top end of the first bracket. The distal end of the first pull rod is hinged to the vertical arm of the second bracket through a second pull rod. The moving end of the second telescopic device is hinged to the distal end of the first pull rod.

[0014] The clamping mechanism in the above scheme is a four-bar linkage consisting of a first bracket, a second bracket, a first pull rod, and a second pull rod. Then, one end of the second telescopic device is connected to the first pull rod to pull the lateral arm of the second bracket to make an arc movement, thereby realizing that the clamping block is fastened to the workpiece and the workpiece is pressed against the V-shaped seat, thus completing the fixed installation of the workpiece on the X-axis guide seat.

[0015] The first drive mechanism includes a first lead screw, an X-axis groove is formed on the upper surface of the bed, and an X-axis guide rail is provided on both sides of the groove opening of the X-axis groove. The first lead screw is fixed in the X-axis groove of the bed by a bearing seat, and the bottom of the X-axis guide seat is fixedly connected to the nut block on the first lead screw. The second drive mechanism includes a second lead screw, a Z-axis groove is formed on the side of the side plate facing the drilling device, and a Z-axis guide rail is provided on both sides of the groove opening of the Z-axis groove. The second lead screw is fixed in the Z-axis groove by a bearing seat, and the side of the Z-axis guide seat away from the drilling device is fixedly connected to the nut block on the second lead screw.

[0016] In the above scheme, the first drive mechanism and the second drive mechanism are respectively embedded in the X-axis groove and the Z-axis groove to avoid interference with other mechanisms. The first lead screw drives the nut block on it to make the bottom of the X-axis guide seat move along the X-axis guide rail, and the second lead screw drives the nut block on it to make the Z-axis guide seat move along the Z-axis guide rail.

[0017] The drilling equipment includes a drilling motor, which is fixedly connected to the Z-axis guide seat and a drilling shaft is mounted on the output shaft of the drilling motor. The drilling shaft coincides with the center line of the workpiece in the horizontal plane.

[0018] The drilling device in the above scheme can be a drilling motor. One end of the drilling motor is connected to a drilling shaft. When installing the drilling motor, the drilling shaft and the center line of the workpiece need to be aligned in the horizontal plane to ensure drilling accuracy.

[0019] It also includes an electrical control box, which is fixedly installed on the other side of the side plate. A first servo motor is installed on the bed and powered by one end of the first lead screw. A second servo motor is installed on the side plate and powered by the second lead screw. The first telescopic rod and the second telescopic rod are selected as one of electric telescopic rod, hydraulic telescopic rod or pneumatic telescopic rod. The electrical control box is electrically connected to the drilling motor, the first servo motor, the second servo motor, the first telescopic rod and the second telescopic rod.

[0020] The above solution has the following advantages:

[0021] 1. This utility model discloses a horizontal deep hole machining equipment, including a bed and a drilling device. The bed is equipped with an X-axis moving device, and the X-axis moving device is equipped with a tooling fixture. The tooling fixture includes a Y-axis positioning mechanism and a clamping mechanism. The Y-axis positioning mechanism is used to place the workpiece and limit its movement along the Y-axis. The clamping mechanism is used to clamp the workpiece onto the Y-axis positioning mechanism. The drilling device includes a Z-axis moving device, and the Z-axis moving device is equipped with a drilling device so that the drilling device can move along the Z-axis. The projection of the centerline of the drilling device coincides with the centerline of the workpiece in the horizontal plane. After the workpiece is positioned relative to the centerline of the drilling device by the Y-axis positioning mechanism, the clamping mechanism can... The workpiece is fixed on the Y-axis positioning mechanism, which ensures that the projection of the workpiece and the drilling equipment in the longitudinal plane coincides, preventing the workpiece from shifting in the Y-axis direction. At the same time, the Z-axis moving device can move the drilling equipment so that its center line coincides with the center line of the workpiece, thereby ensuring the accuracy of deep hole machining. When the workpiece is changed, the center line of the workpiece and the center line of the drilling equipment will shift in the Z-axis direction. The height of the drilling equipment can be adjusted by the Z-axis moving device to ensure that the center line of the drilling equipment coincides with the center line of the workpiece again, thus ensuring that the equipment has sufficient accuracy for deep hole machining of different types of workpieces.

[0022] 2. A V-shaped seat is fixed on the X-axis guide seat, and the openings of the V-shaped seats are connected in series along the X-axis. That is, the projections of the openings of all the V-shaped seats on the YZ plane coincide, so that the V-shaped seat has the function of restricting the workpiece in the Y-axis direction. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0024] Figure 1 This is a front view of the horizontal deep hole machining equipment of this utility model;

[0025] Figure 2 This is a top view of the horizontal deep hole machining equipment of this utility model;

[0026] Figure 3 This is a rear view of the horizontal deep hole machining equipment of this utility model;

[0027] Figure 4 This is a schematic diagram of the clamping mechanism of this utility model;

[0028] Figure 5 yes Figure 4 Side view.

[0029] Reference numerals in the attached drawings: 1. Bed; 101. X-axis groove; 2. X-axis guide rail; 3. X-axis guide seat; 4. First lead screw; 5. Drilling motor; 501. Drilling shaft; 6. Z-axis guide rail; 601. Z-axis groove; 7. Z-axis guide seat; 8. V-shaped seat; 9. First servo motor; 10. Second servo motor; 11. Electrical control box; 12. First bracket; 13. Second bracket; 14. First pull rod; 15. Second pull rod; 16. First telescopic device; 17. First telescopic device; 18. Clamping block; 19. X-axis baffle. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1 to 3 As shown, the horizontal deep hole machining equipment of this embodiment includes a bed 1, a drilling device, and an electrical control box 11. The bed 1 is provided with an X-axis moving device, and the X-axis moving device is provided with a tooling fixture. The tooling fixture includes an X-axis positioning mechanism, a Y-axis positioning mechanism, and a clamping mechanism. The Y-axis positioning mechanism is used to place the workpiece and limit the movement of the workpiece on the Y-axis. The clamping mechanism is used to clamp the workpiece on the Y-axis positioning mechanism. The drilling device includes a Z-axis moving device, and the Z-axis moving device is provided with a drilling device so that the drilling device can move on the Z-axis. The projection of the center line of the drilling device coincides with the center line of the workpiece in the horizontal plane.

[0032] Specifically, the Y-axis positioning mechanism includes two V-shaped seats 8 fixed on the X-axis guide seat 3. One V-shaped seat 8 is fixed on the X-axis guide seat 3, and the other V-shaped seat 8 is slidably mounted on the X-axis guide seat 3 along the X-axis direction. The bottom of the other V-shaped seat 8 and the upper end face of the X-axis guide seat 3 can be engaged by a slider groove. This allows for adaptation to workpieces of different lengths by changing the distance between the two V-shaped seats 8. The X-axis moving device includes a first drive mechanism and an X-axis guide rail 2 arranged along the X-axis on the upper end face of the bed 1. The X-axis guide seat 3 is slidably connected to the X-axis guide rail 2. The first drive mechanism uses... The X-axis guide 3 is driven to move along the X-axis guide rail 2. The Z-axis moving device includes a second drive mechanism and a side plate fixedly connected to the bed 1. A Z-axis guide rail 6 is provided on one side of the side plate. A Z-axis guide 7 is slidably connected on the Z-axis guide rail 6. The second drive mechanism is used to drive the Z-axis guide 7 to move along the Z-axis guide rail 6. The drilling device is fixed on the Z-axis guide 7. The first drive mechanism drives the X-axis guide 3 to move along the X-axis guide rail 2, thereby adjusting the position of the workpiece. The second drive mechanism drives the Z-axis guide 7 to move along the Z-axis guide rail 6, thereby adjusting the height of the drilling device and cooperating with the workpiece to complete the deep hole machining.

[0033] In this embodiment, the X-axis moving device includes an X-axis positioning mechanism, a Y-axis positioning mechanism, and a clamping mechanism. The Y-axis positioning mechanism positions the workpiece relative to the centerline of the drilling equipment, while the X-axis positioning mechanism restricts the workpiece's freedom of movement along the X-axis. The clamping mechanism then fixes the workpiece to the Y-axis positioning mechanism. The Y-axis positioning mechanism ensures that the workpiece and the drilling equipment's projections in the longitudinal plane coincide, preventing workpiece offset in the Y-axis direction. Simultaneously, the Z-axis moving device moves the drilling equipment so that its centerline coincides with the workpiece's centerline, thus ensuring the accuracy of deep hole machining. When the workpiece is changed, the workpiece's centerline and the drilling equipment's centerline will offset in the Z-axis direction. The Z-axis moving device adjusts the height of the drilling equipment to ensure that its centerline coincides with the workpiece's centerline again. Furthermore, during workpiece feeding, the X-axis positioning mechanism, Y-axis positioning mechanism, and clamping mechanism prevent workpiece movement or offset caused by the thrust generated by the drilling equipment, thereby ensuring sufficient accuracy for deep hole machining of different types of workpieces.

[0034] The openings of the V-shaped seats 8 are connected in series along the X-axis, meaning that the projections of all the openings of the V-shaped seats 8 onto the YZ plane coincide, thus enabling the V-shaped seats 8 to restrict the workpiece in the Y-axis direction. Additionally, the X-axis positioning mechanism includes an X-axis baffle 19, which is fixed to one end of the X-axis guide seat and abuts against the end of the workpiece furthest from the drilling device.

[0035] As an example, such as Figure 3 and Figure 4As shown, the clamping mechanism of this embodiment includes a first bracket 12 and a second bracket 13. The bottom end of the first bracket 12 is fixedly connected to the X-axis guide seat 3. The second bracket 13 has an L-shaped structure. One vertical arm of the second bracket 13 is hinged to the top end of the first bracket 12. A first telescopic device 17 is installed on the other horizontal arm. A second telescopic device is hinged to the side of the first bracket 12. The moving end of the first telescopic device 17 faces the bed 1 and a clamping block 18 is fixedly connected to this end. The clamping block 18 is located above the V-shaped seat 8 and the end of the clamping block 18 facing the V-shaped seat 8 is a concave arc, V-shaped, or U-shaped groove. The telescopic device drives the clamping block 18 along the Z-axis to press the workpiece against the V-shaped seat 8. A first pull rod 14 is also hinged to the top end of the first bracket 12. The far end of the first pull rod 14 is hinged to the vertical arm of the second bracket 13 through a second pull rod 15. The moving end of the second telescopic device is hinged to the far end of the first pull rod 14.

[0036] As can be seen, the clamping mechanism is composed of a hinged four-bar linkage consisting of the first bracket 12, the second bracket 13, the first pull rod 14, and the second pull rod 15. Then, one end of the second telescopic device is connected to the first pull rod 14 to pull the lateral support arm of the second bracket 13 to make an arc movement, thereby realizing that the clamping block 18 is fastened to the workpiece and the workpiece is pressed against the V-shaped seat 8, thus completing the fixed installation of the workpiece on the X-axis guide seat 3.

[0037] For example Figure 2 As shown, the first drive mechanism includes a first lead screw 4, an X-axis groove 101 is provided on the upper end face of the bed 1, and an X-axis guide rail 2 is provided on both sides of the groove opening of the X-axis groove 101. The first lead screw 4 is fixed in the X-axis groove 101 of the bed 1 by a bearing seat. The bottom of the X-axis guide seat 3 is fixedly connected to the nut block on the first lead screw 4. The second drive mechanism includes a second lead screw (not shown in the figure), a Z-axis groove 601 is provided on the side of the side plate facing the drilling equipment, and a Z-axis guide rail 6 is provided on both sides of the groove opening of the Z-axis groove 601. The second lead screw is fixed in the Z-axis groove 601 by a bearing seat. The side of the Z-axis guide seat 7 away from the drilling equipment is fixedly connected to the nut block on the second lead screw. The first drive mechanism and the second drive mechanism are respectively embedded in the X-axis groove 101 and the Z-axis groove 601 to avoid interference with other mechanisms. The first lead screw 4 drives the nut block on it to make the bottom of the X-axis guide seat 3 move along the X-axis guide rail 2. The second lead screw drives the nut block on it to make the Z-axis guide seat 7 move along the Z-axis guide rail 6.

[0038] For example Figure 1 As shown, the drilling device in this embodiment can be a drilling motor 5. The drilling motor 5 is fixedly connected to the Z-axis guide seat 7, and a drilling shaft 501 is mounted on the output shaft of the drilling motor 5. The drilling shaft 501 coincides with the center line of the workpiece in the horizontal plane. During operation, it is necessary to ensure that the drilling shaft 501 connected to one end of the drilling motor 5 coincides with the center line of the workpiece in the horizontal plane to ensure the machining accuracy of the deep hole.

[0039] The electrical control box 11 is fixedly installed on the other side of the side plate. A first servo motor 9, which is powered and connected to one end of the first lead screw 4, is installed on the bed 1. A second servo motor 10, which is powered and connected to the second lead screw, is installed on the side plate. The first telescopic rod 17 and the second telescopic rod are selected as one of electric telescopic rod, hydraulic telescopic rod or pneumatic telescopic rod. The electrical control box 11 is electrically connected to the drilling motor 5, the first servo motor 9, the second servo motor 10, the first telescopic rod 17 and the second telescopic rod.

[0040] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A horizontal deep hole machining equipment, comprising a bed (1) and a drilling device, characterized in that, The bed (1) is provided with an X-axis moving device, and the X-axis moving device is provided with a tooling fixture. The tooling fixture includes an X-axis positioning mechanism, a Y-axis positioning mechanism and a clamping mechanism. The Y-axis positioning mechanism is used to place the workpiece and limit the movement of the workpiece on the Y-axis. The X-axis positioning mechanism is used to limit the movement of one end of the workpiece on the Y-axis. The clamping mechanism is used to clamp the workpiece on the Y-axis positioning mechanism. The drilling device includes a Z-axis moving device, and the Z-axis moving device is provided with a drilling device so that the drilling device can move on the Z-axis. The projection of the center line of the drilling device coincides with the center line of the workpiece on the horizontal plane.

2. The horizontal deep hole machining equipment according to claim 1, characterized in that, The Y-axis positioning mechanism includes a V-shaped seat (8) fixed on the X-axis guide seat (3), and the X-axis positioning mechanism includes an X-axis baffle (19). The X-axis baffle (19) is fixed at one end of the X-axis guide seat (3) and is used to abut against the end of the workpiece away from the drilling device.

3. A horizontal deep hole machining equipment according to claim 1 or 2, characterized in that, The X-axis moving device includes a first driving mechanism and an X-axis guide rail (2) arranged along the X-axis on the upper surface of the bed (1). An X-axis guide seat (3) is slidably connected to the X-axis guide rail (2). The first driving mechanism is used to drive the X-axis guide seat (3) to move along the X-axis guide rail (2). The Z-axis moving device includes a second driving mechanism and a side plate fixedly connected to the bed (1). A Z-axis guide rail (6) is provided on one side of the side plate. A Z-axis guide seat (7) is slidably connected to the Z-axis guide rail (6). The second driving mechanism is used to drive the Z-axis guide seat (7) to move along the Z-axis guide rail (6). The drilling device is fixed on the Z-axis guide seat (7).

4. The horizontal deep hole machining equipment according to claim 3, characterized in that, The clamping mechanism includes a first bracket (12) and a second bracket (13). The bottom end of the first bracket (12) is fixedly connected to the bed (1). The second bracket (13) has an L-shaped structure. One vertical arm of the second bracket (13) is hinged to the top end of the first bracket (12). A first telescopic device (17) is installed on the other horizontal arm. The second telescopic device is hinged to the side of the first bracket (12). The moving end of the first telescopic device (17) faces the bed (1) and a clamping block (18) is fixedly connected to that end. The clamping block (18) is located above the V-shaped seat (8), and the end of the clamping block (18) facing the V-shaped seat (8) is a concave arc, V-shaped or U-shaped groove. The telescopic device drives the clamping block (18) along the Z-axis to press the workpiece against the V-shaped seat (8). The top of the first bracket (12) is also hinged to a first pull rod (14). The far end of the first pull rod (14) is hinged to the vertical support arm on the second bracket (13) through a second pull rod (15). The moving end of the second telescopic device is hinged to the far end of the first pull rod (14).

5. A horizontal deep hole machining equipment according to claim 4, characterized in that, The first drive mechanism includes a first lead screw (4), an X-axis groove (101) is provided on the upper end face of the bed (1), the X-axis guide rail (2) is provided on both sides of the groove opening of the X-axis groove (101), the first lead screw (4) is fixed in the X-axis groove (101) of the bed (1) by a bearing seat, and the bottom of the X-axis guide seat (3) is fixedly connected to the nut block on the first lead screw (4). The second drive mechanism includes a second lead screw, a Z-axis groove (601) is provided on the side of the side plate facing the drilling equipment, the Z-axis guide rail (6) is provided on both sides of the groove opening of the Z-axis groove (601), the second lead screw is fixed in the Z-axis groove (601) by a bearing seat, and the side of the Z-axis guide seat (7) away from the drilling equipment is fixedly connected to the nut block on the second lead screw.

6. A horizontal deep hole machining equipment according to claim 5, characterized in that, The drilling equipment includes a drilling motor (5), which is fixedly connected to the Z-axis guide seat (7) and a drilling shaft (501) is installed on the output shaft of the drilling motor (5). The drilling shaft (501) coincides with the center line of the workpiece in the horizontal plane.

7. A horizontal deep hole machining equipment according to claim 6, characterized in that, It also includes an electrical control box (11), which is fixedly installed on the other side of the side plate. A first servo motor (9) is installed on the bed (1) and powered by one end of the first lead screw (4). A second servo motor (10) is installed on the side plate and powered by the second lead screw. The first telescopic rod (17) and the second telescopic rod are selected as one of electric telescopic rod, hydraulic telescopic rod or pneumatic telescopic rod. The electrical control box (11) is electrically connected to the drilling motor (5), the first servo motor (9), the second servo motor (10), the first telescopic rod (17) and the second telescopic rod.

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