General assembly tool for handle lever assembly and pilot valve block

Abstract

The utility model discloses a general assembly tool for a handle lever assembly and a pilot valve block. The general assembly tool comprises a base, a valve block positioning tool, a lifting platform, a movable sliding plate, a positioning shifting fork and a positioning block. The valve block positioning tool is installed in the front half area of the base and used for fixing the pilot valve block. The lifting platform is installed in the rear half area of the base and can ascend and descend in the direction perpendicular to the base through a lifting device. The movable sliding plate is mounted on the lifting platform, and the movable sliding plate can linearly move back and forth on the lifting platform; the positioning shifting fork is mounted at the front end of the movable sliding plate, and the positioning shifting fork can linearly move on the movable sliding plate in the left-right direction; the positioning shifting fork has a circumferential rotation function; the handle rod is sleeved with the positioning block, the positioning block is connected to the positioning shifting fork in a clamped mode, and the handle rod assembly and the pilot valve block are assembled. According to the technical scheme provided by the utility model, the angle of the handle rod is accurately positioned, and high quality and high efficiency of handle final assembly are realized.

Description

Technical Field

[0001] This utility model relates to a general assembly fixture for a handle lever assembly and a pilot valve block, belonging to the field of excavator technology. Background Technology

[0002] To ensure operator comfort, the excavator pilot handle assembly and pilot valve block need to maintain a specific angle after assembly. Currently, the pilot handle assembly and pilot valve block are assembled manually based on experience, without dedicated directional tooling. This makes it impossible to accurately position the axial angle between the handle assembly and the pilot valve block during assembly, affecting the consistency of the left and right handle directions and operational coordination. This impacts assembly quality, failing to meet lean manufacturing requirements, and also affects operator coordination, increases driver fatigue, and poses certain safety hazards. Utility Model Content

[0003] To address the issues of poor positioning accuracy and low assembly efficiency during manual installation, this invention provides a final assembly fixture for the handle rod assembly and pilot valve block, used to accurately position the angle of the handle rod, thereby achieving high quality and high efficiency in handle assembly.

[0004] This utility model is achieved according to the following technical solution:

[0005] A final assembly fixture for a handle lever assembly and a pilot valve block includes:

[0006] Base;

[0007] A valve block positioning fixture is installed in the front half of the base to fix the pilot valve block;

[0008] A lifting platform is installed in the rear half of the base and can move up and down in a direction perpendicular to the base via a lifting device;

[0009] A mobile skateboard is mounted on the lifting platform, and the mobile skateboard is capable of linear movement in the forward and backward directions on the lifting platform;

[0010] A positioning fork is installed at the front end of the movable slide plate, and the positioning fork is capable of linear movement in the left and right directions on the movable slide plate; the positioning fork also has a circumferential rotation function.

[0011] The positioning block is fitted onto the handle rod. The forward and backward position of the moving slide, the left and right position of the positioning fork, and the rotation angle of the positioning fork are adjusted according to the angle of the handle rod, so that the positioning block is engaged with the positioning fork, thereby assembling the handle rod assembly and the pilot valve block.

[0012] In some embodiments, the positioning fork includes:

[0013] A sliding seat is inserted into a sliding groove extending along the left-right direction arranged at the front end of the moving slide plate;

[0014] A semicircular plate with an angle scale is fixed on the front side vertical surface of the sliding seat;

[0015] A shifting fork is rotatably installed on the front side vertical surface of the semicircular plate, the top center of the shifting fork is provided with a pointer for indicating the angle scale, and the positioning block is clamped on the shifting fork.

[0016] In some embodiments, the bottom center of the shifting fork and the semicircular plate are each provided with a through hole arranged on the same axis, and the sliding seat is provided with a threaded hole arranged on the same axis as the through hole, a bolt is inserted into the through hole and tightened in the threaded hole to fix the shifting fork, the semicircular plate and the sliding seat together, and the rotation angle of the shifting fork is adjusted by loosening the bolt.

[0017] In some embodiments, the sliding seat is provided with an oblong hole extending along the left-right direction, and the oblong hole is inserted into a threaded hole on the moving slide plate by a bolt, and the position of the sliding seat in the left-right direction is adjusted by loosening the bolt and cooperating with the thrust component.

[0018] In some embodiments, the thrust component comprises:

[0019] A concave seat is installed on the moving slide plate;

[0020] A rotating rod is provided with a groove arranged along the entire circumference at one lateral end, the rotating rod is clamped on the concave seat under the action of the groove, so that the rotating rod can only rotate circumferentially in the concave seat and cannot move axially; the sliding seat is provided with a threaded hole arranged on the same axis as the rotating rod on the side vertical surface facing the concave seat, the other lateral end of the rotating rod is provided with an external thread, the rotating rod is tightened in the threaded hole, and the circumferential movement of the rotating rod is converted into the linear movement of the sliding seat by rotating the rotating rod under the action of the internal and external threads.

[0021] In some embodiments, the positioning block is a stepped structure with a narrow lower part and a wide upper part, the inner circumferential surface structure of the positioning block is matched with the peripheral contour structure of the handle rod; the inner side vertical surface of the positioning block in contact with the shifting fork is an inclined surface, so that when the shifting fork is in a horizontal state, the inclined positioning block is clamped in the shifting fork.

[0022] In some embodiments, the lifting platform is provided with at least two sliding rails arranged in parallel and extending along the front-back direction of the lifting platform; the sliding rails are installed with sliding blocks, and the moving slide plate is installed on all the sliding blocks; the moving slide plate is provided with a moving handle for driving the moving slide plate to move forward and backward on the lifting platform.

[0023] In some embodiments, the lifting device comprises:

[0024] A plurality of support rods are fixed on the base in a manner that the central axis is perpendicular to the horizontal plane of the base, and the lifting platform is sleeved on the plurality of support rods;

[0025] A top plate is fixed on the top surface of the plurality of support rods in a manner that the top plate is parallel to the base;

[0026] A lead screw and a sliding block are fixed at the middle area of the lifting platform in the front-rear direction, the lead screw penetrates through the top plate and the lifting platform and is in contact with the base in a manner that the lead screw is perpendicular to the base, the lead screw is rotationally connected with the base and the top plate through a bearing, and the lead screw is threadedly connected with the sliding block;

[0027] A hand wheel is installed on the part of the lead screw protruding from the top plate, rotating the hand wheel drives the lead screw to rotate, and the circumferential movement of the lead screw is converted into the linear movement of the lifting platform under the action of the internal and external threads.

[0028] In some embodiments, the valve block positioning tool is composed of a base plate and a plurality of positioning rods fixed on the base plate in a manner that the positioning rods are perpendicular to the base plate; the pilot valve block falls into the positioning space surrounded by the plurality of positioning rods, so as to limit the movement of the pilot valve block in the front-rear and left-right directions.

[0029] In some embodiments, the valve block positioning tool can position two pilot valve blocks side by side in the left-right direction; the front end of the moving slide plate is provided with two positioning forks side by side in the left-right direction, the left positioning fork is matched with a positioning block to assemble the left handle rod, and the right positioning fork is matched with a positioning block to assemble the right handle rod.

[0030] The utility model discloses beneficial effects:

[0031] The utility model discloses utilize lifting platform, thrust part, positioning fork and so on positioning clamping tool, improve the positioning accuracy when installing the pilot handle, eliminate the problem that the installation accuracy deviation is bigger when manually assembling, improve the assembly efficiency, reduce the labor intensity and safety risk. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are part of the present application, serve to further understand the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, but do not constitute improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the premise that the drawings meet the requirements.

[0033] In the drawings:

[0034] Figure 1 It is a general assembly assembly tool overall schematic view of a handle rod assembly and a pilot valve block of the utility model;

[0035] Figure 2 It is a general assembly assembly tool application schematic view of a handle rod assembly and a pilot valve block of the utility model;

[0036] Figure 3 It is Figure 2 The top view;

[0037] Figure 4 It is a partial enlarged view of the positioning fork and the positioning block of the utility model;

[0038] Figure 5 It is Figure 4 The top view.

[0039] The drawing label: 1 - base, 2 - valve block positioning tool, 3 - support rod, 4 - lifting platform, 5 - slide rail, 6 - moving slide plate, 7 - thrust part, 8 - positioning fork, 9 - positioning block, 10 - lifting device, 11 - top plate, 12 - lead screw, 13 - hand wheel, 14 - bottom plate, 15 - positioning rod, 16 - concave seat, 17 - rotating rod, 18 - sliding seat, 19 - semicircular plate, 20 - fork.

[0040] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the utility model in any way, but to illustrate the concept of the utility model to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and the following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0042] In the description of the utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] like Figure 1 , Figure 2 , Figure 3 As shown, an assembly fixture for a handle rod assembly and a pilot valve block includes a base 1, a valve block positioning fixture 2, a lifting platform 4, a movable slide plate 6, a positioning fork 8, and a positioning block 9. The valve block positioning fixture 2 is installed in the front half of the base 1 to fix the pilot valve block. The lifting platform 4 is installed in the rear half of the base 1 and can move up and down in a direction perpendicular to the base 1 via a lifting device 10. The movable slide plate 6 is installed on the lifting platform 4 and can move linearly in the front and back direction on the lifting platform 4. The positioning fork 8 is installed at the front end of the movable slide plate 6 and can move linearly in the left and right direction on the movable slide plate 6. The positioning fork 8 has a circumferential rotation function. The positioning block 9 is fitted onto the handle rod, and the front and back position of the movable slide plate 6, the left and right position of the positioning fork 8, and the rotation angle of the positioning fork 8 are adjusted according to the angle of the handle rod, so that the positioning block 9 is engaged with the positioning fork 8, thereby assembling the handle rod assembly and the pilot valve block.

[0045] The following provides a further explanation of the specific structure of the aforementioned positioning shift fork.

[0046] like Figure 4 , Figure 5 As shown, the positioning fork 8 includes a sliding seat 18, a semi-circular plate 19 with angle scale, and a fork 20; the sliding seat 18 is inserted into a sliding groove that extends in the left and right direction and is located at the front end of the movable slide plate 6; the semi-circular plate 19 is fixed on the front side of the sliding seat 18; the fork 20 is rotatably mounted on the front side of the semi-circular plate 19, and a pointer for indicating the angle scale is provided at the top center of the fork 20; the positioning block 9 is snapped onto the fork 20.

[0047] Further options, such as Figure 4 , Figure 5 As shown, both the shift fork 20 and the semicircular plate 19 have a through hole arranged on the same axis at the bottom center. The sliding seat 18 has a threaded hole arranged on the same axis as the through hole. After the bolt is inserted into the through hole, it is tightened in the threaded hole to fix the shift fork 20 together with the semicircular plate 19 and the sliding seat 18. The rotation angle of the shift fork 20 can be adjusted by loosening the bolt.

[0048] Further solutions, as shown in Figure 4 , Figure 5 , the sliding seat 18 is provided with an elongated circular hole extending along the left-right direction, and a bolt is screwed into the threaded hole on the moving slide plate 6 after penetrating through the elongated circular hole; the position of the sliding seat 18 in the left-right direction is adjusted by loosening the bolt and cooperating with the thrust part 7.

[0049] The specific structure of the above-mentioned thrust part is further described below.

[0050] As shown in Figure 4 , Figure 5 , the thrust part 7 includes a concave seat 16 and a rotating rod 17; the concave seat 16 is installed on the moving slide plate 6; one transverse end of the rotating rod 17 is provided with a groove arranged along the entire circumference, and the rotating rod 17 is clamped in the concave seat 16 under the action of the groove, so that the rotating rod 17 can only rotate circumferentially in the concave seat 16 and cannot move axially; the sliding seat 18 is provided with a threaded hole coaxially arranged with the rotating rod 17 on the side surface facing the concave seat 16, and the other transverse end of the rotating rod 17 is provided with an external thread, and the rotating rod 17 is screwed into the threaded hole; rotating the rotating rod 17 converts the circumferential movement of the rotating rod 17 into the linear movement of the sliding seat 18 under the action of the internal and external threads.

[0051] Further solutions, as shown in Figure 4 , Figure 5 , the positioning block 9 is a stepped structure with a narrow lower part and a wide upper part, and the inner circumferential surface structure of the positioning block 9 is matched with the peripheral contour structure of the handle rod; the inner side surface of the positioning block 9 in contact with the shift fork 20 is an inclined surface, so that when the shift fork 20 is in a horizontal state, the inclined positioning block 9 is clamped in the shift fork.

[0052] The specific structure of the connection between the lifting platform and the moving slide plate is further described below.

[0053] As shown in Figure 1 , Figure 2 , Figure 3 , the lifting platform 4 is provided with at least two sliding rails 5 arranged in parallel and extending along the front-back direction of the lifting platform; the sliding rails 5 are installed with sliding blocks, and the moving slide plate 6 is installed on all the sliding blocks; the moving slide plate 6 is provided with a moving handle for driving the moving slide plate 6 to move forward and backward on the lifting platform 4.

[0054] The specific structure of the above-mentioned lifting device is further described below.

[0055] As shown in Figure 1 , Figure 2 , Figure 3As shown, the lifting device 10 comprises a plurality of support rods 3, a top plate 11, a lead screw 12, a sliding block and a hand wheel 13; the central axis of the plurality of support rods 3 is fixed on the base 1 in a manner perpendicular to the horizontal plane of the base 1, and the lifting platform 4 is sleeved on the plurality of support rods 3; the top plate 11 is fixed on the top surface of the plurality of support rods 3 in a manner parallel to the base 1; the sliding block is fixed at the middle region of the lifting platform 4 in the front-rear direction, the lead screw 12 penetrates through the top plate 11 and the lifting platform 4 and is in contact with the base 1 at the rear, the lead screw 12 is rotationally connected with the base 1 and the top plate 11 through bearings, and the lead screw 12 is threadedly connected with the sliding block; the hand wheel 13 is installed on the part of the lead screw 12 protruding from the top plate 11, rotating the hand wheel 13 drives the lead screw 12 to rotate, and under the action of the internal and external threads, the circumferential movement of the lead screw 12 is converted into the linear movement of the lifting platform 4.

[0056] The specific structure of the valve block positioning tool is further described below.

[0057] As shown in Figure 1 , Figure 2 , Figure 3 , the valve block positioning tool 2 is composed of a bottom plate 14 and a plurality of positioning rods 15 fixed on the bottom plate 14 in a manner perpendicular to the bottom plate 14; the pilot valve block falls into the positioning space surrounded by the plurality of positioning rods 15, and is used to limit the movement of the pilot valve block in the four directions of front, rear, left and right.

[0058] Further, as shown in Figure 1 , Figure 2 , Figure 3 , the valve block positioning tool 2 can position two pilot valve blocks side by side in the left-right direction; the front end of the moving slide plate 6 is provided with two positioning forks 8 side by side in the left-right direction, the left positioning fork 8 is matched with a positioning block 9 to assemble the left handle rod, and the right positioning fork 8 is matched with a positioning block 9 to assemble the right handle rod.

[0059] In summary, the handle rod assembly and the total assembly tool for the pilot valve block are provided, the positioning block, the positioning fork and the lifting device are designed according to the structure of the handle assembly, the flexible fixing, accurate orientation and rapid assembly of the handle rod assembly and the pilot valve block are realized, the product quality consistency can be effectively guaranteed, the labor intensity of personnel is reduced, and the assembly efficiency is improved. The implementation process is as follows:

[0060] The bottom plate 1 is used to integrate various devices into a whole and serves as the overall support.

[0061] The valve block positioning tool 2 is a detachable positioning structure and is used for positioning the pilot valve block; the structure can fix the pilot valve block above by using the mounting hole of the pilot valve block to prevent the valve block from moving during installation.

[0062] Supporting rod 3 cooperates with bottom plate 1 and lifting platform 4, and is used for supporting the whole tooling and guiding the lifting platform 4.

[0063] Lifting platform 4 is used for adjusting the positioning of the height of the tooling, and can be adjusted in cooperation with different valve block heights.

[0064] Slide rail 5 is used for guiding and moving the moving slide plate 6.

[0065] Moving slide plate 6 is used for adjusting the positioning of the front and back directions of the tooling, and can be adjusted in cooperation with different handle rod angles.

[0066] Thrust part 7 is used for adjusting the positioning of the left and right directions of the tooling, and can be adjusted in cooperation with different handle rod angles.

[0067] Positioning fork 8 is used in cooperation with positioning block 9, and the installation angle thereof can be adjusted according to different handle rod angles.

[0068] Positioning block 9 needs to be sleeved on the handle rod, and then moving slide plate 6 is pushed to make positioning fork 7 cooperate with positioning block 8 for installation.

[0069] Lifting device 10 is used for lifting the lifting platform 4, so as to adjust the height of the tooling.

[0070] It needs to be explained that the utility model simply uses the external structural characteristics of the parts to be assembled in space to realize three-point positioning and ensure the accurate positioning of the handle rod angle, ensure the consistency of each handle assembly, and has high assembly efficiency and high practicability; the detachable positioning fork and the positioning block are used to process the clamping problem of the handle bending part, the clamping angle of the combined positioning fork and the positioning block is used to realize directional clamping in cooperation with the inner surface; the assembly efficiency and the product quality consistency can be effectively improved. The utility model is also applicable to engineering machinery, shipbuilding, aerospace, automobile manufacturing and other fields related to handle assembly or directional assembly.

[0071] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0072] In addition, those skilled in the art can understand that although some embodiments described herein include certain features contained in other embodiments but not other features, the combination of features of different embodiments also means that it is within the protection scope of the utility model and forms different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0073] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make minor changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the present application.

Claims

1. An assembly tool for assembling a handle lever assembly and a pilot valve block, characterized in that, It comprises: a base; a valve block positioning tool installed in the front half area of the base for fixing the pilot valve block; a lifting platform installed in the rear half area of the base and capable of lifting movement in the direction perpendicular to the base through a lifting device; a moving slide plate installed on the lifting platform and capable of linear movement in the front-rear direction on the lifting platform; a positioning fork installed at the front end of the moving slide plate and capable of linear movement in the left-right direction on the moving slide plate; the positioning fork has a circumferential rotation function; a positioning block sleeved on the handle rod, which adjusts the front-rear position of the moving slide plate, the left-right position of the positioning fork, and the rotation angle of the positioning fork according to the angle of the handle rod, so that the positioning block is clamped on the positioning fork, thereby assembling the handle rod assembly and the pilot valve block.

2. An assembly tool for a handlebar assembly and a pilot valve block according to claim 1, characterized in that The positioning fork comprises: a sliding seat inserted into a sliding groove extending along the left-right direction arranged at the front end of the moving slide plate; a semicircular plate with an angle scale fixed on the front side of the sliding seat; a fork rotatably installed on the front side of the semicircular plate, the top center of the fork is provided with a pointer for indicating the angle scale, and the positioning block is clamped on the fork.

3. An assembly tool for a handlebar assembly and a pilot valve block according to claim 2, characterized in that: The bottom center of the fork and the semicircular plate is provided with a through hole arranged on the same axis, and the sliding seat is provided with a threaded hole arranged on the same axis as the through hole, the bolt is inserted into the through hole and tightened in the threaded hole to fix the fork, the semicircular plate and the sliding seat together, and the rotation angle of the fork is adjusted by loosening the bolt.

4. An assembly tool for a handlebar assembly and a pilot valve block according to claim 2, characterized in that: The sliding seat is provided with an elongated circular hole extending along the left-right direction, and the bolt is inserted into the elongated circular hole and tightened in the threaded hole on the moving slide plate; the position of the sliding seat in the left-right direction is adjusted by loosening the bolt and cooperating with the thrust component.

5. An assembly tool for a handlebar assembly and a pilot valve block according to claim 4, wherein The thrust component comprises: a concave seat installed on the moving slide plate; a rotating rod, one transverse end of which is provided with a groove arranged along the entire circumference, the rotating rod is clamped on the concave seat under the action of the groove, so that the rotating rod can only rotate circumferentially in the concave seat and cannot move axially; the sliding seat is provided with a threaded hole arranged on the same axis as the rotating rod on the side surface facing the concave seat, the other transverse end of the rotating rod is provided with an external thread, the rotating rod is tightened in the threaded hole, and the rotating rod is rotated, which converts the circumferential movement of the rotating rod into the linear movement of the sliding seat under the action of the internal and external threads.

6. An assembly tool for a handlebar assembly and a pilot valve block according to claim 2, characterized in that: The positioning block has a stepped structure with a narrow bottom and a wide top, the inner circumferential surface structure of the positioning block is matched with the peripheral contour structure of the handle rod; the inner side surface of the positioning block in contact with the fork is an inclined surface, so that when the fork is in a horizontal state, the inclined positioning block is clamped in the fork.

7. An assembly tool for a handlebar assembly and a pilot valve block according to claim 1, characterized in that: The lifting platform is provided with at least two sliding rails arranged in parallel and extending along the front-rear direction of the lifting platform; the sliding blocks are installed on the sliding rails, and the moving slide plate is installed on all the sliding blocks; the moving handle is arranged on the moving slide plate for moving the moving slide plate forward and backward on the lifting platform.

8. An assembly tool for a handlebar assembly and a pilot valve block according to claim 1, wherein The lifting device comprises: A plurality of support rods are fixed on the base in a manner that their central axes are perpendicular to the horizontal plane of the base, and the lifting platform is sleeved on the plurality of support rods; A top plate is fixed on the top surface of the plurality of support rods in a manner that it is parallel to the base; A lead screw and a sliding block are provided, the sliding block is fixed at the middle area of the lifting platform in the front-rear direction, the lead screw penetrates the top plate and the lifting platform and is in contact with the base in a manner that it is perpendicular to the base, the lead screw is rotationally connected with the base and the top plate through a bearing, and the lead screw is threadedly connected with the sliding block; A hand wheel is installed on the part of the lead screw that protrudes from the top plate, rotating the hand wheel drives the lead screw to rotate, and under the action of the internal and external threads, the circumferential movement of the lead screw is converted into the linear movement of the lifting platform.

9. An assembly tool for a handlebar assembly and a pilot valve block according to claim 1, characterized in that: The valve block positioning tool is composed of a bottom plate and a plurality of positioning rods fixed on the bottom plate in a manner that they are perpendicular to the bottom plate; the pilot valve block falls into the positioning space surrounded by the plurality of positioning rods, and is used to limit the movement of the pilot valve block in the four directions of front, back, left and right.

10. An assembly tool for a handlebar assembly and a pilot valve block according to claim 1, characterized in that: The valve block positioning tool can position two pilot valve blocks side by side in the left-right direction; the front end of the moving sliding plate is provided with two positioning forks side by side in the left-right direction, the left positioning fork is matched with a positioning block to assemble the left handle rod, and the right positioning fork is matched with a positioning block to assemble the right handle rod.

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