A method of assembling a truck door assembly

Abstract

The application discloses a truck door assembling device assembling method, which comprises a door taking device for transporting and taking and placing a door, a door preassembling clamp for preassembling the door and being connected with the door taking device, a door positioning clamp for installing the door on a vehicle body and being connected with the door preassembling clamp, and a clamp driving device for driving the door positioning clamp to move to a door installing position; the door positioning clamp comprises a clamp connecting rod for being connected with the clamp driving device and a positioning clamp frame connected with the clamp connecting rod; the clamp connecting rod is provided with a posture adjusting structure for adjusting an assembling posture of the positioning clamp frame; the positioning clamp frame is provided with a clamp positioning mechanism for being installed and positioned on the vehicle body, a gap adjusting mechanism for supporting the door and adjusting an assembling gap between the door and the vehicle body, and a pressing mechanism for detachably fixing the door on the positioning clamp frame.

Description

Technical Field

[0001] This invention relates to the field of automotive body manufacturing equipment technology, specifically to an assembly method for a truck door assembly device. Background Technology

[0002] In the manufacturing process of heavy-duty truck bodies, strict requirements are placed on the opening and closing dimensions and clearances of the doors. It is necessary to ensure that the internal and external clearances, surface differences, and other dimensional requirements are met after the doors are opened and closed. Specifically, there are twelve measurement points along the circumference of the door frame for the internal clearance, and eight measurement points for the external clearance and surface difference, each with different requirements. On mass production lines, the control of door assembly clearances is extremely stringent. Furthermore, door assembly must be fast, with good clearance consistency and high operability.

[0003] Patent CN110712503A discloses a car door mounting device assembly, including a car door hinge, a flattening block, and a mounting dummy lock. The car door hinge includes a body mounting part and a door mounting part that are hinged to each other. The door mounting part is used to connect to the car door, and the body mounting part is used to connect to the car body. The body mounting part is provided with a hinge positioning pin, which is used to pre-position the car door hinge and the car door to the car body. The mounting dummy lock is pre-installed in a latch mounting hole on the car body. The flattening block is fixed to the surface difference between the side panel and the car door. The flattening block, the mounting dummy lock, and the hinge positioning pin are used to adjust the position of the car door after it is pre-positioned to the car body. The body mounting part is further provided with a fastener for fixing the car door hinge to a specific position on the car body after the car door position is adjusted.

[0004] Patent CN103625577A discloses an automotive door assembly tooling component, including a support plate that matches the contour of a car sill, having an inner end located inside the car sill and an outer end located outside the car sill, to support the lower edge of an automotive door assembly mounted on the car door frame; a retaining member fixed to the outer end of the support plate and matching the outer side of the car sill to hold the support plate to the car sill; and a door positioning plate formed by the inner end of the support plate extending upward along the inner edge of the car sill to position the inner side of the lower edge of the automotive door assembly at the inner edge of the car sill. Using this automotive door assembly tooling component, the gap distance between the lower edge of the automotive door assembly and the sill, and the gap distance between the side edge of the automotive door assembly and the door frame can be easily and accurately determined during the installation of the automotive door assembly, thereby improving the assembly efficiency and quality of the automotive door assembly and enhancing the stability of the assembled automotive door assembly.

[0005] Patent CN110254570B discloses an assembly method and device for automobile doors. The assembly method includes: positioning a pre-assembled door assembly on a tooling fixture using an outer panel; positioning a pre-assembled hinge on the tooling fixture, ensuring the hinge and door assembly are in a pre-fitted state; positioning the tooling fixture on a pre-assembled vehicle body, ensuring the door assembly and hinge are in a pre-fitted state with the body; fitting the body and door assembly to the hinges; assembling the body, door assembly, and hinges; and removing the tooling fixture. The assembly method and device provided by this invention ensure that the gap and surface difference between the door assembly and the body meet requirements, improving the assembly quality between the door assembly and the body, and simplifying the assembly process.

[0006] The disadvantages of the aforementioned patent are: 1. Long cycle time for a single process; 2. Complex operation process, not suitable for mass production; 3. Workers need to make multiple trips to complete the assembly process. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a systematic and flexible assembly device and method for truck doors that can adapt to the needs of doors of different sizes and different assembly gaps.

[0008] To achieve this objective, the truck door assembly device designed in this invention includes a door retrieval device for transporting and loading / unloading the door, and a door pre-assembly fixture that docks with the door retrieval device for pre-installing the door. It also includes a door positioning fixture that docks with the door pre-assembly fixture for mounting the door onto the vehicle body, and a fixture driving device for driving the door positioning fixture to the door installation position. The door positioning fixture includes a fixture connecting rod for connecting to the fixture driving device and a positioning fixture frame connected to the fixture connecting rod. The fixture connecting rod is provided with a posture adjustment structure for adjusting the assembly posture of the positioning fixture frame. The positioning fixture frame is provided with a fixture positioning mechanism for positioning the door on the vehicle body, a gap adjustment mechanism for supporting the door and adjusting the assembly gap between the door and the vehicle body, and a clamping mechanism for detachably fixing the door to the positioning fixture frame.

[0009] Furthermore, the clamp connecting rod includes a connecting straight rod with its top fixed to the power output end of the clamp driving device, an attitude adjustment block with its top hinged to the left and right sides of the bottom of the connecting straight rod, and a connecting block with its top hinged to the front and rear sides of the bottom of the attitude adjustment block. The positioning clamp frame is fixed on the connecting block.

[0010] Furthermore, the attitude adjustment structure includes a clamp attitude adjustment plate fixedly connected to the middle of the attitude adjustment block, a front and rear attitude adjustment plate located directly above the clamp attitude adjustment plate fixedly connected to the bottom of the connecting rod, and a left and right attitude adjustment plate located directly below the clamp attitude adjustment plate fixedly connected to the middle of the connecting block; the front and rear attitude adjustment plates are connected to the clamp attitude adjustment plate through the front and rear attitude adjustment structure, and the left and right attitude adjustment plates are connected to the clamp attitude adjustment plate through the left and right attitude adjustment structure.

[0011] Furthermore, the front and rear attitude adjustment structure includes at least one clamp attitude adjustment threaded hole respectively opened on the front and rear sides of the clamp attitude adjustment plate, and front and rear attitude adjustment threaded holes respectively opened on the front and rear sides of the front and rear attitude adjustment plate, corresponding one-to-one with the clamp attitude adjustment threaded holes on the front and rear sides of the clamp attitude adjustment plate. A screw is connected between the front and rear attitude adjustment threaded holes and the clamp attitude adjustment threaded holes on the front and rear sides of the clamp attitude adjustment plate. The left and right attitude adjustment structure includes at least one clamp attitude adjustment threaded hole respectively opened on the left and right sides of the clamp attitude adjustment plate, and left and right attitude adjustment threaded holes respectively opened on the left and right sides of the left and right attitude adjustment plates, corresponding one-to-one with the clamp attitude adjustment threaded holes on the left and right sides of the clamp attitude adjustment plate. A screw is connected between the left and right attitude adjustment threaded holes and the clamp attitude adjustment threaded holes on the left and right sides of the clamp attitude adjustment plate.

[0012] Furthermore, the fixture positioning mechanism includes a main positioning pin mechanism and an auxiliary positioning pin mechanism fixed to the left and right sides of the positioning fixture frame; the main positioning pin mechanism includes a main positioning pin support fixed to the positioning fixture frame, a main positioning pin slidably disposed within the main positioning pin support, and a main positioning pin drive structure for driving the main positioning pin to move within the main positioning pin support; the auxiliary positioning pin mechanism includes an auxiliary positioning pin support fixed to the positioning fixture frame, an auxiliary positioning pin slidably disposed within the auxiliary positioning pin support, and an auxiliary positioning pin drive structure for driving the auxiliary positioning pin to move within the auxiliary positioning pin support.

[0013] Furthermore, the main positioning pin support includes a main positioning pin fixing support and a main positioning pin guide sleeve fixed within the main positioning pin fixing support. The middle portion of the main positioning pin is coaxially slidably disposed within the main positioning pin guide sleeve. The main positioning pin driving structure includes a main positioning pin driving rod connected to the lower end of the main positioning pin for driving the main positioning pin to move axially within the main positioning pin guide sleeve. The auxiliary positioning pin support includes an auxiliary positioning pin fixing support and an auxiliary positioning pin guide sleeve fixed on the auxiliary positioning pin fixing support. The middle portion of the auxiliary positioning pin is coaxially slidably disposed within the auxiliary positioning pin guide sleeve. The auxiliary positioning pin driving structure includes an auxiliary positioning pin driving rod connected to the lower end of the auxiliary positioning pin for driving the auxiliary positioning pin to move axially within the auxiliary positioning pin guide sleeve.

[0014] Furthermore, the gap adjustment mechanism includes a door mounting support block detachably fixed to the positioning fixture frame for supporting the bottom of the door and adjusting the X-axis and Z-axis positions of the door; a door surface difference adjustment block detachably fixed to the positioning fixture frame, engaging with the outer surface of the door, for adjusting the Y-axis position of the door; and a door gap adjustment block detachably fixed to the positioning fixture frame, engaging with the side edge of the door, for adjusting the installation gap of the door.

[0015] Furthermore, the clamping mechanism includes an X / Z manual clamp detachably fixed to the positioning fixture frame for clamping the middle door panel of the car door and restricting the X and Z direction movement of the car door, and an X / Y manual clamp detachably fixed to the positioning fixture frame for clamping the side door panel of the car door and restricting the X and Y direction movement of the car door.

[0016] Furthermore, the clamp driving device includes a conveyor track arranged along the vehicle assembly conveyor line, a drive mechanism that can move along the conveyor track, and an assistive robotic arm connected between the drive mechanism and the clamp connecting rod.

[0017] The assembly method based on the truck door assembly device described above includes the following steps:

[0018] Step 1: The door retrieval device transports the door to the door pre-assembly fixture and installs the door onto the door pre-assembly fixture;

[0019] Step 2: Install the car door from the pre-installed door fixture onto the car body, and adjust the position of the car door until the assembly gap between the car door and the car body is qualified;

[0020] Step 3: The clamp drive device transports the door positioning clamp to the door docking position, and the clamp positioning mechanism positions and installs the door positioning clamp onto the vehicle body.

[0021] Step 4: Keep the door in its installed position on the vehicle body, and install the door onto the door positioning fixture using the attitude adjustment structure, gap adjustment mechanism and clamping mechanism;

[0022] Step 5: Remove the car door from the car body, keeping the car door in the installation position on the door positioning clamp, and then install the car door back onto the car body;

[0023] Step Six: Determine whether the assembly gap between the door and the body is acceptable. If it is not acceptable, adjust the installation gap between the door and the body until it is acceptable. Repeat steps four and five above until the result of determining the assembly gap between the door and the body is acceptable.

[0024] Step 7: Keep the door in the installation state on the door positioning fixture, transfer the door from the door positioning fixture to the door pre-assembly fixture, and install the door from the door pre-assembly fixture onto the vehicle body;

[0025] Step 8: Determine again whether the assembly gap between the door and the body is acceptable. If it is not acceptable, adjust the installation gap between the door and the body until it is acceptable. Repeat steps 3 to 7 above until the result of determining the assembly gap between the door and the body is acceptable.

[0026] The beneficial effects of this invention are as follows: Based on a car door positioning fixture, a fixture positioning mechanism is installed on it to facilitate convenient and precise positioning on the vehicle body. A gap adjustment mechanism and a clamping mechanism ensure the car door is installed and positioned on the door positioning fixture. The relative installation state between the car door and the vehicle body can be changed by adjusting the state of the gap adjustment mechanism. Therefore, by first determining the state of the gap adjustment mechanism of the door positioning fixture, and then using the clamping mechanism, the installation position of the car door on the door positioning fixture and the accuracy of the door installation on the vehicle body can be guaranteed. There is no need to readjust the installation state of the car door on the vehicle body to ensure qualified door installation. The position of the door positioning fixture can be adjusted by the fixture drive device and the fixture connecting rod to ensure that it always meets the accurate docking position with the car door or vehicle body. This invention is convenient to operate and has good practicality. The door positioning fixture is used in conjunction with the door production line and the door pre-assembly fixture. The door positioning fixture can be used as a transition to adjust the position of each component of the door pre-assembly fixture and directly position the door coming off the production line to meet the assembly requirements of the car body. This avoids the steps of adjusting the installation gap and installation surface difference after the door is installed, effectively reducing the workload of manual door assembly and improving work efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the vehicle door transportation status in this invention;

[0028] Figure 2 This is a top view of the door conveyor rail in this invention;

[0029] Figure 3This is a front view of the assembly of the door pre-assembly fixture and the door in this invention;

[0030] Figure 4 This is a front view of the door positioning clamp docking with the door in this invention;

[0031] Figure 5 The three-dimensional form of the clamp connecting rod in this invention Figure 1 ;

[0032] Figure 6 The three-dimensional form of the clamp connecting rod in this invention Figure 2 ;

[0033] Figure 7 This is a perspective view of the connecting rod in this invention;

[0034] Figure 8 This is a perspective view of the attitude adjustment block in this invention;

[0035] Figure 9 This is a perspective view of the connecting block in this invention;

[0036] Figure 10 This is an assembly perspective view of the door positioning fixture and the fixture connecting rod in this invention;

[0037] Figure 11 This is a perspective view of the positioning fixture frame in this invention;

[0038] Figure 12 This is a perspective view of the main locating pin mechanism in this invention;

[0039] Figure 13 This is a perspective view of the main positioning pin mechanism without the main positioning pin fixing support in this invention;

[0040] Figure 14 This is a perspective view of the auxiliary positioning pin mechanism in this invention;

[0041] Figure 15 This is a perspective view of the auxiliary positioning pin fixing support in this invention;

[0042] Figure 16 This is a perspective view of the first door mounting support block in this invention;

[0043] Figure 17 This is a perspective view of the second door mounting support block in this invention;

[0044] Figure 18 This is a perspective view of the first door surface difference adjustment block in this invention;

[0045] Figure 19 This is a perspective view of the second door surface difference adjustment block in this invention;

[0046] Figure 20This is a perspective view of the first door gap adjustment block in this invention;

[0047] Figure 21 This is a perspective view of the second door gap adjustment block in this invention;

[0048] Figure 22 This is a front view of the structure of the door positioning fixture and the door assembly in this invention;

[0049] Figure 23 This is a front view of the vehicle body in this invention;

[0050] Figure 24 This is a front view of the structure of the door positioning clamp in this invention for installing a door onto the vehicle body;

[0051] Wherein, 1—clamp connecting rod (1.1—connecting straight rod, 1.2—attitude adjustment block, 1.3—connecting block), 2—positioning clamp frame, 3—clamp attitude adjustment plate, 4—front and rear attitude adjustment plate, 5—left and right attitude adjustment plate, 6—clamp attitude adjustment threaded hole, 7—front and rear attitude adjustment threaded hole, 8—vehicle body, 9—left and right attitude adjustment threaded hole, 10—main positioning pin mechanism (10.1—main positioning pin support, 10.2—main positioning pin), 11—auxiliary positioning pin Mechanism (11.1—Auxiliary positioning pin support, 11.2—Auxiliary positioning pin), 12—Main positioning pin fixing support, 13—Main positioning pin guide sleeve, 14—Main positioning pin drive rod, 15—Auxiliary positioning pin fixing support, 16—Auxiliary positioning pin guide sleeve, 17—Auxiliary positioning pin drive rod, 18—X / Z direction manual clamp, 19—X / Y direction manual clamp, 20—Vehicle door, 21—First vehicle door mounting support block (21.1—First bottom fixing block, 21. 2—First bottom support block), 22—Second door mounting support block (22.1—Second bottom fixing block, 22.2—Second bottom support block), 23—First door surface difference adjustment block (23.1—First middle fixing block, 23.2—First middle pushing block), 24—Second door surface difference adjustment block (24.1—Second side fixing block, 24.2—Second side pushing block), 25—First door gap adjustment block (25.1—First side fixing block, 25.2—Second side pushing block). 2—First gap adjustment plate), 26—Second door gap adjustment block (26.1—Second side fixing block, 26.2—Second gap adjustment plate), 27—Hinge shaft cylinder, 28—Ear plate, 29—Connecting reinforcing plate, 30—Bracket connecting plate, 31—Bracket fixing plate, 32—Conveying rail, 33—Assistive robotic arm, 34—Door pre-assembly fixture, 35—Door positioning fixture, 36—Longitudinal slide rail, 37—Transverse slide rail, 38—Electric hoist, 39—Door retrieval hook. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0053] like Figure 1 The truck door assembly device shown in Figure 24 includes a door retrieval device for transporting and retrieving the door, and a door pre-assembly fixture 34 that docks with the door retrieval device for pre-installing the door. It also includes a door positioning fixture 35 that docks with the door pre-assembly fixture 34 for mounting the door 20 onto the vehicle body 8, and a fixture drive device for driving the door positioning fixture 35 to the door installation position. The door positioning fixture 35 includes a fixture connecting rod 1 for connecting to the fixture drive device and a positioning fixture frame 2 connected to the fixture connecting rod 1. The fixture connecting rod 1 is provided with a posture adjustment structure for adjusting the assembly posture of the positioning fixture frame 2. The positioning fixture frame 2 is provided with a fixture positioning mechanism for positioning the door 20 on the vehicle body 8, a gap adjustment mechanism for supporting the door 20 and adjusting the assembly gap between the door 20 and the vehicle body 8, and a clamping mechanism for detachably fixing the door 20 onto the positioning fixture frame 2.

[0054] like Figure 4 The truck door assembly fixture shown in Figure 24 includes a fixture connecting rod 1 for connection to a fixture drive device and a positioning fixture frame 2 connected to the fixture connecting rod 1; the fixture connecting rod 1 is provided with a posture adjustment structure for adjusting the assembly posture of the positioning fixture frame 2; the positioning fixture frame 2 is provided with a fixture positioning mechanism for mounting and positioning the door 20 on the vehicle body 8, a gap adjustment mechanism for supporting the door 20 and adjusting the assembly gap between the door 20 and the vehicle body 8, and a clamping mechanism for detachably fixing the door 20 to the positioning fixture frame 2.

[0055] like Figure 4 As shown, the clamp driving device includes a conveyor track 32 and a assisted robotic arm 33. The assisted robotic arm 33 is an outsourced component, and its structure will not be described in detail in this patent. The conveyor track 32 can be an I-beam assembly, also an outsourced component, and its structure will not be described in detail in this patent. The conveyor track 32 and the assisted robotic arm 33 can be connected by a conveyor trolley, and the assisted robotic arm 33 can move along the conveyor track 32.

[0056] like Figure 5 As shown in Figure 9, the clamp connecting rod 1 includes a connecting straight rod 1.1 with its top fixed to the power output end of the clamp driving device, an attitude adjustment block 1.2 with its top hinged to the left and right sides of the bottom of the connecting straight rod 1.1, and a connecting block 1.3 with its top hinged to the front and rear sides of the bottom of the attitude adjustment block 1.2. The positioning clamp frame 2 is fixed on the connecting block 1.3. A hinged shaft cylinder 27 is fixed to the bottom of the connecting rod 1.1. The attitude adjustment block 1.2 includes a clamp attitude adjustment plate 3, an ear plate 28 vertically fixed to the top surface of the clamp attitude adjustment plate 3, and a hinged shaft cylinder 27 fixed to the bottom surface of the clamp attitude adjustment plate 3. The attitude adjustment block 1.2 is hinged to the hinged shaft cylinder 27 at the bottom of the connecting rod 1.1 via the ear plate 28. The connecting block 1.3 includes left and right attitude adjustment plates 5, an ear plate 28 vertically fixed to the left and right attitude adjustment plates 5, and a bracket connecting plate 30 fixed to the left and right attitude adjustment plates 5 via a connecting reinforcing plate 29. A bracket fixing plate 31 is fixed on the bracket connecting plate 30. The connecting block 1.3 is hinged to the hinged shaft cylinder 27 of the attitude adjustment block 1.2 via the ear plate 28 thereon. Figure 7 As shown, the bracket fixing plate 31 is fixed on the positioning fixture frame 2 to realize the connection between the fixture connecting rod 1 and the positioning fixture frame 2.

[0057] The attitude adjustment structure includes a clamp attitude adjustment plate 3 fixedly connected to the middle of the attitude adjustment block 1.2, a front and rear attitude adjustment plate 4 located directly above the clamp attitude adjustment plate 3 fixedly connected to the bottom of the connecting rod 1.1, and a left and right attitude adjustment plate 5 located directly below the clamp attitude adjustment plate 3 fixedly connected to the middle of the connecting block 1.3. The front and rear attitude adjustment plates 4 and the clamp attitude adjustment plate 3 are connected by a front and rear attitude adjustment structure, which includes at least one clamp attitude adjustment threaded hole 6 respectively opened on the front and rear sides of the clamp attitude adjustment plate 3, and front and rear attitude adjustment threaded holes 7 opened on the front and rear sides of the front and rear attitude adjustment plates 4, corresponding one-to-one with the clamp attitude adjustment threaded holes 6 on the front and rear sides of the clamp attitude adjustment plate 3. A screw (not shown in the figure) is connected between the front and rear attitude adjustment threaded holes 7 and the clamp attitude adjustment threaded holes 6 on the front and rear sides of the clamp attitude adjustment plate 3. Similarly, the left and right attitude adjustment plates 5 and the clamp attitude adjustment plate 4 are connected by a left and right attitude adjustment structure. The left and right attitude adjustment structure includes at least one clamp attitude adjustment threaded hole 6 opened on the left and right sides of the clamp attitude adjustment plate 3, and left and right attitude adjustment threaded holes 9 opened on the left and right sides of the left and right attitude adjustment plate 5, corresponding one-to-one with the clamp attitude adjustment threaded holes 6 on the left and right sides of the clamp attitude adjustment plate 3. A screw (not shown in the figure) is connected between the left and right attitude adjustment threaded holes 9 and the clamp attitude adjustment threaded holes 5 on the left and right sides of the clamp attitude adjustment plate 3.

[0058] like Figure 10As shown in Figure 15, the fixture positioning mechanism includes a main positioning pin mechanism 10 and an auxiliary positioning pin mechanism 11 fixed to the left and right sides of the positioning fixture frame 2. The main positioning pin mechanism 10 includes a pin fixed to the left and right sides of the positioning fixture frame 2, such as... Figure 12 The main positioning pin support 10.1, the main positioning pin 10.2 slidably disposed within the main positioning pin support 10.1, and the main positioning pin drive structure for driving the main positioning pin 10.2 to move within the main positioning pin support 10.1 are shown in Figure 13. The main positioning pin support 10.1 includes a main positioning pin fixing support 12 and a main positioning pin guide sleeve 13 fixed within the main positioning pin fixing support 12. The middle part of the main positioning pin 10.2 is coaxially slidably disposed within the main positioning pin guide sleeve 13. The main positioning pin drive structure includes a main positioning pin drive rod 14 connected to the lower end of the main positioning pin 10.2 for driving the main positioning pin 10.2 to move axially within the main positioning pin guide sleeve 13. The main positioning pin drive rod 14 is driven downward or upward, and then converted into the up-and-down movement of the main positioning pin 10.2 by a conversion mechanism that can convert rotational motion into linear motion, such as a gear rack, cam mechanism, etc. This can be achieved by various structures, which are common technical means used by those skilled in the art, and this invention does not limit it.

[0059] The auxiliary positioning pin mechanism 11 includes a pin fixed to the positioning fixture frame 2, such as... Figure 14 The auxiliary positioning pin support 11.1, the auxiliary positioning pin 11.2 slidably disposed within the auxiliary positioning pin support 11.1, and the auxiliary positioning pin drive structure for driving the auxiliary positioning pin 11.2 to move within the auxiliary positioning pin support 11.1 are shown in Figure 15. The auxiliary positioning pin support 11.1 includes an auxiliary positioning pin fixing support 15 and an auxiliary positioning pin guide sleeve 16 fixed to the auxiliary positioning pin fixing support 15. The middle portion of the auxiliary positioning pin 11.2 is coaxially slidably disposed within the auxiliary positioning pin guide sleeve 16. The auxiliary positioning pin drive structure includes an auxiliary positioning pin drive rod 17 connected to the lower end of the auxiliary positioning pin 11.2 for driving the auxiliary positioning pin 11.2 to move axially within the auxiliary positioning pin guide sleeve 16. Rotating the auxiliary positioning pin drive rod 17 clockwise or counterclockwise converts the rotational motion into linear motion through a conversion mechanism, such as a gear and rack mechanism or a cam mechanism, which can achieve this up-and-down movement of the auxiliary positioning pin 11.2. This can be achieved through various structures, which are common techniques used by those skilled in the art, and this invention does not limit the specific techniques used.

[0060] The gap adjustment mechanism includes a door mounting support block detachably fixed to the positioning fixture frame 2 for supporting the bottom of the door 20 and adjusting the X and Z positions of the door 20; a door surface difference adjustment block detachably fixed to the positioning fixture frame 2, cooperating with the outer surface of the door 20, for adjusting the Y position of the door 20; and a door gap adjustment block detachably fixed to the positioning fixture frame 2, cooperating with the side edge of the door 20, for adjusting the installation gap of the door 20.

[0061] like Figure 10 —11 and Figure 16 As shown in Figure 17, the door mounting support block includes a first door mounting support block 21 and a second door mounting support block 22. The first door mounting support block 21 includes a first bottom fixing block 21.1 fixed to the positioning clamp frame 2 and a first bottom support block 21.2 fixed to the first bottom fixing block 21.1. The distance between the first bottom fixing block 21.1 and the first bottom support block 21.2 can be adjusted by adding or removing shims. The first bottom fixing block 21.1 has a slot that engages with the bottom of the door 20, supporting and engaging the door 20. The second door mounting support block 22 includes a second bottom fixing block 22.1 fixed to the positioning clamp frame 2 and a second bottom support block 22.2 fixed to the second bottom fixing block 22.1. The distance between the second bottom fixing block 22.1 and the second bottom support block 22.2 can be adjusted by adding or removing shims. The second bottom fixing block 22.1 has a slot that engages with the bottom of the door 20, supporting and engaging the door 20.

[0062] like Figure 10 —11 and Figure 18 As shown in Figure 19, the door surface difference adjustment block includes a first door surface difference adjustment block 23 and a second door surface difference adjustment block 24. The first door surface difference adjustment block 23 includes a first central fixing block 23.1 fixed to the positioning fixture frame 2 and a first central pushing block 23.2 fixed to the first central fixing block 23.1. The distance between the first central fixing block 23.1 and the first central pushing block 23.2 can be adjusted by adding or removing shims. The second door surface difference adjustment block 24 includes a second central fixing block 24.1 fixed to the positioning fixture frame 2 and a second central pushing block 24.2 fixed to the second central fixing block 24.1. The distance between the second central fixing block 24.1 and the second central pushing block 24.2 can be adjusted by adding or removing shims. By pushing the door 20 with the first central pushing block 23.2 and the second central pushing block 24.2, the assembly surface difference between the door 20 and the body 8 is adjusted.

[0063] like Figure 10 —11 and Figure 20 As shown in Figure 21, the door gap adjusting block includes a first door gap adjusting block 25 and a second door gap adjusting block 26. The first door gap adjusting block 25 includes a first side fixing block 25.1 fixed to the positioning fixture frame 2 and a first gap adjusting plate 25.2 fixed thereon. The second door gap adjusting block 26 includes a second side fixing block 26.1 fixed to the positioning fixture frame 2 and a second gap adjusting plate 26.2 fixed thereon. The first gap adjusting plate 25.2 and the second gap adjusting plate 26.2 cooperate with the side of the door 20 to adjust the assembly gap between the door 20 and the body 8.

[0064] like Figure 10 As shown in Figure 11, the clamping mechanism includes an X / Z manual clamp 18 that is detachably fixed to the positioning fixture frame 2 and is used to clamp the middle door panel of the door 20 and restrict the X and Z direction movement of the door 20, and an X / Y manual clamp 19 that is detachably fixed to the positioning fixture frame 2 and is used to clamp the side door panel of the door 20 and restrict the X and Y direction movement of the door 20.

[0065] The aforementioned positioning fixture frame 2, along with the door mounting support block, door surface difference adjustment block, and door gap adjustment block located on it, together constitute the door positioning fixture 35. The positioning fixture frame 2 is fixed by multiple octagonal tubes and L-shaped, T-shaped, or cross-shaped connecting blocks. Each surface of the octagonal tube has bolt holes along its length, which can be used to fix the door mounting support block, door surface difference adjustment block, and door gap adjustment block to multiple positions on the positioning fixture frame 2 by bolts, so that the positions of the door mounting support block, door surface difference adjustment block, and door gap adjustment block on the positioning fixture frame 2 are adjustable.

[0066] like Figure 22 As shown in Figure 24, the door positioning fixture 35 moves with the assisted robotic arm 33 to the corresponding position of the door pre-installation fixture 34, and transfers the door 20 onto the door positioning fixture 35. The door 20 is positioned on the door positioning fixture 35 by the door mounting support block, the door surface difference adjustment block, the door gap adjustment block and the clamping mechanism. The manual adjustment of the robotic arm 33 drives the door positioning fixture 25 to move the door 20 to the assembly position with the body 8. The front-back position of the door positioning fixture 35 is adjusted by rotating the screw connecting the front and rear attitude adjustment threaded holes 7 and the clamp attitude adjustment threaded holes 6 on the front and rear sides of the fixture attitude adjustment plate 3. The left and right position of the door positioning fixture 35 is adjusted by rotating the screw connecting the left and right attitude adjustment threaded holes 9 and the clamp attitude adjustment threaded holes 5 on the left and right sides of the fixture attitude adjustment plate 3. The door 20 is then aligned with the body 8. The positions of the door mounting support block, the door surface difference adjustment block, and the door gap adjustment block on the positioning fixture frame 2 are adjusted to ensure that the door 20 meets the assembly requirements with the body 8. At this point, the door positioning fixture 35 can assemble the same model of door 20 on the production line without further adjustment of the state of the door positioning fixture 35. The installation accuracy of the door 20 can be guaranteed simply by assembling the door 20 onto the body 8 using the door positioning fixture 35.

[0067] In summary, the assembly method based on the above-described truck door assembly device includes the following steps:

[0068] Step 1: The door removal device transports the door 20 to the door pre-installation fixture 34 and installs the door 20 onto the door pre-installation fixture 34;

[0069] Step 2: Install the door 20 from the door pre-installation fixture 34 onto the body 8, and adjust the posture of the door 20 until the assembly gap between the door 20 and the body 8 is qualified.

[0070] Step 3: The clamp drive device transports the door positioning clamp 35 to the door docking position, and the clamp positioning mechanism positions and installs the door positioning clamp 35 on the vehicle body 8.

[0071] Step 4: Keep the door 20 in the installation state on the body 8, and install the door 20 onto the door positioning clamp 35 through the posture adjustment structure, gap adjustment mechanism and clamping mechanism;

[0072] Step 5: Remove the door 20 from the body 8, keeping the door 20 in the installation position on the door positioning clamp 35, and then install the door 20 back onto the body 8;

[0073] Step Six: Determine whether the assembly gap between the door 20 and the body 8 is qualified. If it is not qualified, adjust the installation gap between the door 20 and the body 8 until it is qualified. Repeat Steps Four and Five above until the result of determining the assembly gap between the door 20 and the body 8 is qualified.

[0074] Step 7: Keep the door 20 in the installation state on the door positioning fixture 35, transfer the door 20 from the door positioning fixture 35 to the door pre-installation fixture 34, and install the door 20 from the door pre-installation fixture 34 onto the body 8.

[0075] Step 8: Determine again whether the assembly gap between the door 20 and the body 8 is qualified. If it is not qualified, adjust the installation gap between the door 20 and the body 8 until it is qualified. Repeat steps 3 to 7 above until the result of determining the assembly gap between the door 20 and the body 8 is qualified.

[0076] In summary, this invention is based on a door positioning clamp 35, on which a clamp positioning mechanism is provided for convenient and accurate positioning on the vehicle body 8. A gap adjustment mechanism and a clamping mechanism ensure the door 20 is installed and positioned on the door positioning clamp 35. The relative installation state between the door 20 and the vehicle body 8 can be changed by adjusting the state of the gap adjustment mechanism. Therefore, by first determining the state of the gap adjustment mechanism of the door positioning clamp 35, and then using the clamping mechanism, the installation position of the door 20 on the door positioning clamp 35 and the accuracy of the door 20 installation on the vehicle body 8 can be guaranteed. There is no need to readjust the installation state of the door 20 on the vehicle body 8 to ensure the door 20 is installed correctly. The position of the door positioning clamp 35 can be adjusted by the clamp driving device and the clamp connecting rod 1 to ensure that it always meets the accurate docking position with the door 20 or the vehicle body 8, making it convenient to operate and highly practical. The door positioning fixture 35 is used in conjunction with the door production line and the door pre-assembly fixture 34. The door positioning fixture 35 can be used as a transition to adjust the position of each component of the door pre-assembly fixture 34 and directly position the door 20 coming off the production line to meet the assembly requirements of the body 8. This avoids the steps of adjusting the installation gap and installation surface difference of the door 20 after installation, effectively reducing the workload of manual door assembly and improving work efficiency.

[0077] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. When using the terms "comprising," "having," and "including" as described in this specification, there may also be another part or other parts, and the terms used are generally singular but may also represent plural forms. Furthermore, the technical solutions of this invention are limited only by the scope of the claims. Finally, it should be pointed out that the above embodiments are merely representative examples of this invention. Obviously, this invention is not limited to the above embodiments, and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this invention should be considered to fall within the protection scope of this invention.

Claims

1. An assembly method for a truck door assembly device, the truck door assembly device comprising a door retrieval device for transporting and retrieving the door and a door pre-assembly fixture (34) docking with the door retrieval device for pre-installing the door, characterized in that: It also includes a door positioning fixture (35) for docking with the door pre-assembly fixture (34) and for mounting the door (20) onto the vehicle body (8), and a fixture driving device for driving the door positioning fixture (35) to move to the door installation position; the door positioning fixture (35) includes a fixture connecting rod (1) for connecting to the fixture driving device and a positioning fixture frame (2) for connecting to the fixture connecting rod (1); the fixture connecting rod (1) is provided with a posture adjustment structure for adjusting the assembly posture of the positioning fixture frame (2); the positioning fixture frame (2) is provided with a fixture positioning mechanism for mounting and positioning it on the vehicle body (8), a gap adjustment mechanism for supporting the door (20) and adjusting the assembly gap between the door (20) and the vehicle body (8), and a clamping mechanism for detachably fixing the door (20) onto the positioning fixture frame (2); The assembly method of the truck door assembly device includes the following steps: Step 1: The door removal device transports the door (20) to the door pre-installation fixture (34) and installs the door (20) onto the door pre-installation fixture (34); Step 2: Install the door (20) from the door pre-installation fixture (34) onto the body (8), and adjust the posture of the door (20) until the assembly gap between the door (20) and the body (8) is qualified; Step 3: The clamp drive device transports the door positioning clamp (35) to the door docking position, and the clamp positioning mechanism positions and installs the door positioning clamp (35) on the vehicle body (8); Step 4: Keep the door (20) installed on the body (8), and install the door (20) on the door positioning clamp (35) through the posture adjustment structure, gap adjustment mechanism and clamping mechanism; Step 5: Remove the door (20) from the body (8), keep the door (20) in the installation state on the door positioning clamp (35), and install the door (20) back onto the body (8); Step 6: Determine whether the assembly gap between the door (20) and the body (8) is qualified. If it is not qualified, adjust the installation gap between the door (20) and the body (8) to be qualified. Repeat steps 4 and 5 above until the result of determining the assembly gap between the door (20) and the body (8) is qualified. Step 7: Keep the door (20) in the installation state on the door positioning fixture (35), transfer the door (20) from the door positioning fixture (35) to the door pre-installation fixture (34), and install the door (20) from the door pre-installation fixture (34) onto the vehicle body (8); Step 8: Determine again whether the assembly gap between the door (20) and the body (8) is qualified. If it is not qualified, adjust the installation gap between the door (20) and the body (8) to be qualified. Repeat steps 3 to 7 above until the result of determining the assembly gap between the door (20) and the body (8) is qualified.

2. The assembly method of the truck door assembly device as described in claim 1, characterized in that: The clamp connecting rod (1) includes a connecting straight rod (1.1) with its top fixed to the power output end of the clamp driving device, an attitude adjustment block (1.2) with its top hinged to the left and right sides of the bottom of the connecting straight rod (1.1), and a connecting block (1.3) with its top hinged to the front and rear sides of the bottom of the attitude adjustment block (1.2). The positioning clamp frame (2) is fixed on the connecting block (1.3).

3. The assembly method of the truck door assembly device as described in claim 2, characterized in that: The attitude adjustment structure includes a clamp attitude adjustment plate (3) fixedly connected to the middle of the attitude adjustment block (1.2), a front and rear attitude adjustment plate (4) located directly above the clamp attitude adjustment plate (3) fixedly connected to the bottom of the connecting rod (1.1), and a left and right attitude adjustment plate (5) located directly below the clamp attitude adjustment plate (3) fixedly connected to the middle of the connecting block (1.3); the front and rear attitude adjustment plate (4) and the clamp attitude adjustment plate (3) are connected by the front and rear attitude adjustment structure, and the left and right attitude adjustment plate (5) and the clamp attitude adjustment plate (3) are connected by the left and right attitude adjustment structure.

4. The assembly method of the truck door assembly device as described in claim 3, characterized in that: The front and rear attitude adjustment structure includes at least one clamp attitude adjustment threaded hole (6) opened on the front and rear sides of the clamp attitude adjustment plate (3) and a front and rear attitude adjustment threaded hole (7) opened on the front and rear sides of the front and rear attitude adjustment plate (4) and corresponding to the clamp attitude adjustment threaded holes (6) on the front and rear sides of the clamp attitude adjustment plate (3). A screw is connected between the front and rear attitude adjustment threaded hole (7) and the clamp attitude adjustment threaded hole (6) on the front and rear sides of the clamp attitude adjustment plate (3). The left and right attitude adjustment structure includes at least one clamp attitude adjustment threaded hole (6) opened on the left and right sides of the clamp attitude adjustment plate (3) and left and right attitude adjustment threaded holes (9) opened on the left and right sides of the left and right attitude adjustment plate (5) and corresponding to the clamp attitude adjustment threaded holes (6) on the left and right sides of the clamp attitude adjustment plate (3). The left and right attitude adjustment threaded holes (9) and the clamp attitude adjustment threaded holes (6) on the left and right sides of the clamp attitude adjustment plate (3) are connected by screws.

5. The assembly method of the truck door assembly device as described in claim 1, characterized in that: The fixture positioning mechanism includes a main positioning pin mechanism (10) and an auxiliary positioning pin mechanism (11) fixed to the left and right sides of the positioning fixture frame (2); the main positioning pin mechanism (10) includes a main positioning pin support (10.1) fixed to the positioning fixture frame (2) and an auxiliary positioning pin mechanism (11) slidably disposed on the main positioning pin support (10.1). The auxiliary positioning pin mechanism (11) includes an auxiliary positioning pin support (11.1) fixed on the positioning fixture frame (2), an auxiliary positioning pin (11.2) slidably disposed in the auxiliary positioning pin support (11.1), and an auxiliary positioning pin drive structure for driving the auxiliary positioning pin (11.2) to move within the auxiliary positioning pin support (11.1).

6. The assembly method of the truck door assembly device as described in claim 5, characterized in that: The main positioning pin support (10.1) includes a main positioning pin fixing support (12) and a main positioning pin guide sleeve (13) fixed in the main positioning pin fixing support (12). The middle part of the main positioning pin (10.2) is coaxially slidably disposed in the main positioning pin guide sleeve (13). The main positioning pin drive structure includes a main positioning pin drive rod (14) connected to the lower end of the main positioning pin (10.2) for driving the main positioning pin (10.2) to move axially in the main positioning pin guide sleeve (13). The auxiliary positioning pin support (11.1) includes an auxiliary positioning pin fixing support (15) and an auxiliary positioning pin guide sleeve (16) fixed on the auxiliary positioning pin fixing support (15). The middle part of the auxiliary positioning pin (11.2) is coaxially slidably disposed in the auxiliary positioning pin guide sleeve (16). The auxiliary positioning pin driving structure includes an auxiliary positioning pin driving rod (17) connected to the lower end of the auxiliary positioning pin (11.2) for driving the auxiliary positioning pin (11.2) to move axially within the auxiliary positioning pin guide sleeve (16).

7. The assembly method of the truck door assembly device as described in claim 1, characterized in that: The gap adjustment mechanism includes a door mounting support block detachably fixed to the positioning fixture frame (2) for supporting the bottom of the door (20) and adjusting the X-direction and Z-direction positions of the door (20); a door surface difference adjustment block detachably fixed to the positioning fixture frame (2) for cooperating with the outer surface of the door (20) and adjusting the Y-direction position of the door (20); and a door gap adjustment block detachably fixed to the positioning fixture frame (2) for cooperating with the side edge of the door (20) and adjusting the installation gap of the door (20).

8. The assembly method of the truck door assembly device as described in claim 1, characterized in that: The clamping mechanism includes an X / Z manual clamp (18) detachably fixed to the positioning clamp frame (2) for clamping the middle door panel of the door (20) and restricting the X and Z direction movement of the door (20), and an X / Y manual clamp (19) detachably fixed to the positioning clamp frame (2) for clamping the side door panel of the door (20) and restricting the X and Y direction movement of the door (20).

9. The assembly method of the truck door assembly device as described in claim 1, characterized in that: The clamp drive device includes a conveyor track (32) arranged along the vehicle assembly conveyor line, a drive mechanism that can move along the conveyor track (32), and an assistive robotic arm (33) connected between the drive mechanism and the clamp connecting rod (1).

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