Bridge type five-axis gantry machining center with automatic exchange table

Abstract

The invention relates to the technical field of numerical control machine tool machining, in particular to a bridge type five-axis gantry machining center with an automatic exchange table, which comprises a worktable base, an exchange table base and a guide mechanism, the top of the exchange table base is provided with an exchange table which can be butted with the worktable base, and the guide mechanism is arranged between the exchange table base and the exchange table and is used for guiding the exchange table to move. Comprising a guide rail, a sliding base arranged on the guide rail in a sliding mode, a roller supporting assembly arranged on the sliding base in a stepped mode and an oil supply assembly used for driving lubricating oil to circularly flow in the sliding base. The device has the beneficial effects that the multiple roller supporting assemblies are arranged on the sliding base in a stepped mode, the roller supporting assemblies can abut against the guide rails when pressed, and the abutting number of the roller supporting assemblies can be adjusted in a self-adaptive mode according to the weight of the exchange workbench in the clamping stage of the exchange workbench; therefore, the weight of the pin roller intervening in work is matched with that of the workpiece, the workpiece is stably supported, and meanwhile the unnecessary contact area is reduced so as to reduce friction.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a bridge-type five-axis gantry machining center with an automatic exchange table. Background Art

[0002] The bridge-type five-axis gantry machining center is a high-end CNC machine tool with the characteristics of high rigidity, high precision and multi-axis linkage. It is widely used in aerospace, automotive molds, energy and other fields. In order to improve the utilization rate of the gantry machining center, it is usually equipped with a translational double exchange worktable.

[0003] For example, the patent with publication number CN106166680A discloses a machine tool worktable exchange system for a gantry machining center flexible line, including multiple machining center hosts, multiple host pallet seats, multiple pallet warehouses, multiple loading and unloading stations, transport trolleys and trolley tracks, each of the host pallet seats is installed on the first bracket, each of the pallet warehouses is installed on the second bracket, each of the loading and unloading stations is installed on the third bracket, the transport trolley is installed on the fourth bracket, each of the machining center hosts is equipped with a host pallet seat, the transport trolley is installed on the trolley track, and the transport trolley can move horizontally in the X direction along the trolley track. The exchange system can realize the smooth, continuous and fast exchange of worktables, meeting the exchange requirements of machine tool worktables of the gantry machining center flexible line.

[0004] As in the prior art of the above-mentioned patent, the exchange table is supported and guided when moving by the cooperation of the guide rail and the slide. The guide rail and the slide are usually in surface contact, or rollers are set on the slide for rolling contact. Although the surface contact between the guide rail and the slide can form an oil film through lubricating oil to reduce the friction coefficient, the guide rail and the slide still have a large friction under heavy loads, and the contact surface between the two will also wear out after long-term use; the guide rail and the slide are in rolling contact through rollers, and the friction can be reduced to a certain extent by setting rollers, but in order to achieve effective support for the exchange table under high load conditions, a large number of rollers need to be set on the slide. However, a large number of rollers will cause an increase in friction under low load conditions, heat at the contact position, and increased energy consumption. Therefore, a bridge-type five-axis gantry machining center with an automatic exchange table is urgently needed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a bridge-type five-axis gantry machining center with an automatic exchange table to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bridge-type five-axis gantry machining center with an automatic exchange table, comprising a worktable base and an exchange table base, a top of the exchange table base is provided with an exchange table capable of docking with the worktable base, and also includes a guide mechanism, which is arranged between the exchange table base and the exchange table, and comprises a guide rail, a slide seat slidably arranged on the guide rail, a roller support assembly arranged in a stepped shape on the slide seat, and an oil supply assembly for driving lubricating oil to circulate in the slide seat;

[0007] The roller support assembly can abut against the top of the guide rail under the pressure of the exchange workbench, and the abutment amount of the roller support assembly can be adaptively adjusted according to the weight of the exchange workbench during the clamping stage of the exchange workbench; the oil supply assembly is transmission-arranged on the roller support assembly, and when the oil supply assembly abuts against the guide rail and moves, it can drive the oil supply assembly to work and transport lubricating oil.

[0008] Preferably, the roller support assembly is stepped and mirror-distributed on the slide, and when the roller support assembly is subjected to the pressure of the exchange workbench, the roller support assembly close to the end of the slide first abuts against the guide rail.

[0009] Preferably, the guide mechanism further comprises a connecting frame, which is fixedly mounted on the bottom of the exchange workbench and is used to connect the roller support assembly and the exchange workbench.

[0010] Preferably, the roller support assembly includes a mounting bracket, a top end of which is passed through the connecting frame and a bottom end of which is passed through the sliding seat. The external movable sleeve of the mounting bracket is provided with a compression spring, a top end of which abuts against the bottom of the connecting frame and can continuously apply elastic force to the mounting bracket.

[0011] Preferably, the roller support assembly further comprises a support roller, which is movably and horizontally mounted on the bottom of the mounting bracket, and the axis of the mounting bracket is perpendicular to the moving direction of the slide.

[0012] Preferably, the oil supply assembly is arranged at the bottom of the mounting bracket, the oil supply assembly is drivingly connected to the supporting roller at the bottom of the mounting bracket, and the number of the oil supply assembly arranged at the bottom of the mounting bracket is not less than one group.

[0013] Preferably, after the support roller abuts against the top of the guide rail, the distance between the bottom of the oil supply assembly and the top of the guide rail is not less than 5 mm.

[0014] Preferably, the inner wall of the slide seat contacts the outer wall of the guide rail, and sealing baffles are fixedly mounted on both ends of the slide seat, and the slide seat can form a sealed cavity inside thereof through the sealing baffles.

[0015] Preferably, the guide mechanism further comprises a locking assembly, which comprises a locking screw, which is rotatably connected to the bottom of the exchange workbench and is spirally connected to the mounting bracket, and the locking screw can rotate when the mounting bracket moves up and down.

[0016] Preferably, the locking assembly further comprises a reversing portion, which is arranged on both sides of the roller support assembly and is used to adjust the allowed rotation direction of the locking screw.

[0017] In the above technical scheme, the beneficial effects of the present invention are as follows: by arranging a plurality of roller support assemblies on the slide seat in a stepped manner, the roller support assemblies can be pressed against the guide rails, and the abutment number of the roller support assemblies can be adaptively adjusted according to the weight of the exchange workbench during the clamping stage of the exchange workbench, so that the weight of the rollers involved in the work is matched to the weight of the workpiece, thereby achieving stable support for the workpiece and reducing unnecessary contact area to reduce friction; an oil supply assembly is arranged on the roller, and when the roller rotates, it can drive the lubricating oil to circulate in the cavity of the slide seat, thereby achieving lubrication of the guide rails, and the heat generated by friction can be taken away by the flowing lubricating oil.

[0018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0019] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the structure after the overall combination of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the top of the workbench base of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the top of the base of the switching platform of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the side view of the connection position between the exchange table base and the exchange workbench of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a side section of the guide mechanism of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the stepped distribution of the roller support assembly of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the other side section of the guide mechanism of the present invention;

[0028] Figure 8 It is a schematic diagram of the overall structure of the roller support assembly of the present invention;

[0029] Fig. 9 This is a schematic diagram of the structure of the bottom of the mounting bracket of the present invention;

[0030] Fig.10 It is a structural schematic diagram of the oil supply assembly of the present invention;

[0031] Fig.11 It is a schematic diagram of the structure of the locking assembly and the connecting frame of the present invention;

[0032] Fig.12 For the present invention Fig.11 A schematic diagram of the structure enlarged at A;

[0033] Fig.13 It is a structural schematic diagram of the installation position of the sealing baffle of the present invention.

[0034] Description of reference numerals:

[0035] In the figure: 1. bed; 2. workbench base; 3. exchange table base; 4. exchange table; 5. drive mechanism;

[0036] 6. Guide mechanism; 61. Guide rail; 62. Slide seat; 63. Connecting frame; 64. Roller support assembly; 641. Mounting bracket; 642. Compression spring; 643. Limiting ring; 644. Support roller; 65. Locking assembly; 651. Locking screw; 652. Bidirectional adjustable ratchet; 653. Transmission push rod; 654. Transmission rack; 66. Oil supply assembly; 661. Micro pump housing; 662. Pump oil gear; 67. Sealing baffle;

[0037] 7. Position-changing electric push rod. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] See also Figure 1-13 The embodiment of the present invention provides a technical solution: a bridge-type five-axis gantry machining center with an automatic exchange table, including a worktable base 2 and an exchange table base 3, a top of the exchange table base 3 is provided with an exchange table 4 that can be docked with the worktable base 2, and also includes a guide mechanism 6, which is arranged between the exchange table base 3 and the exchange table 4, including a guide rail 61, a slide 62 slidably arranged on the guide rail 61, a roller support assembly 64 stepped on the slide 62, and an oil supply assembly 66 for driving the lubricating oil to circulate in the slide 62;

[0040] The roller support assembly 64 can abut against the top of the guide rail 61 under the pressure of the exchange workbench 4, and the abutment amount of the roller support assembly 64 can be adaptively adjusted according to the weight of the exchange workbench 4 during the clamping stage of the exchange workbench 4; the oil supply assembly 66 is transmission-disposed on the roller support assembly 64, and when the oil supply assembly 66 abuts against the guide rail 61 and moves, it can drive the oil supply assembly 66 to work and transport the lubricating oil.

[0041] Specifically, two groups of exchange workbenches 4 can be alternately docked with the workbench base 2, and after clamping the workpiece, they can be moved to the workbench base 2 under the drive of the driving mechanism 5 to process the workpiece. When one group of exchange workbenches 4 is moved to the workbench base 2 for processing, the workpiece can be disassembled and assembled on the other group of exchange workbenches 4; a plurality of stepped and mirror-distributed roller support assemblies 64 are arranged on the slide 62, and the roller support assemblies 64 can be moved downward and abutted on the guide rail 61 under the pressure of the exchange workbench 4 and the workpiece, and the number of roller support assemblies 64 abutting on the guide rail 61 during the clamping stage of the exchange workbench 4 can be adaptively adjusted according to the weight of the exchange workbench 4 and the workpiece, and the number of roller support assemblies 64 abutting gradually increases with the increase in the number of workpieces. , so that the number of roller support assemblies 64 intervening in the work is adapted to the weight of the workpiece, thereby achieving stable support for the workpiece while reducing unnecessary contact area to reduce friction; the oil supply assembly 66 is transmission-connected with the support roller 644, and when the support roller 644 abuts against the guide rail 61 and moves, the rotation of the support roller 644 can drive the oil supply assembly 66 to work, and since the slide 62 is relatively sealed and arranged on the outside of the guide rail 61, the oil supply assembly 66 can drive the lubricating oil to circulate in the cavity of the slide 62, lubricate the contact position between the slide 62 and the guide rail 61, and drive the heat generated by friction through the flowing lubricating oil, and as the number of roller support assemblies 64 abutting increases, the number of oil supply assemblies 66 intervening in the work increases, so as to increase the flow speed of the lubricating oil under high load conditions.

[0042] Compared with the prior art, the present invention arranges a plurality of roller support assemblies 64 in steps on the slide 62. The roller support assemblies 64 can be pressed against the guide rail 61. During the clamping stage of the exchange workbench 4, the abutment number of the roller support assemblies 64 can be adaptively adjusted according to the weight of the exchange workbench 4, so that the weight of the rollers involved in the work is matched with the weight of the workpiece, thereby achieving stable support for the workpiece and reducing unnecessary contact area to reduce friction. An oil supply assembly 66 is arranged on the roller in a linkage manner. When the roller rotates, it can drive the lubricating oil to circulate in the cavity of the slide 62, thereby lubricating the guide rail 61, and the heat generated by friction can be taken away by the flowing lubricating oil.

[0043] In one embodiment provided by the present invention, a bridge-type five-axis gantry machining center with an automatic exchange table also includes a bed 1, a worktable base 2 is movably installed on the top of the bed 1, and is transmission-connected to an existing drive assembly on the bed 1, the worktable base 2 is driven by the drive assembly to adjust the machining position, and can realize the docking of the worktable base 2 and the exchange worktable 4; a driving mechanism 5 is arranged on the top of the exchange table base 3, and the driving mechanism 5 is the prior art. After the worktable base 2 is docked with the exchange worktable 4, the driving mechanism 5 can drive the exchange worktable 4 to move on the top of the exchange table base 3 and the top of the worktable base 2, and the exchange worktables 4 at the corresponding positions are driven to move by the driving mechanisms 5 on the top of the two groups of exchange table bases 3, so that the two groups of exchange worktables 4 can be alternately moved to the top of the worktable base 2 to work.

[0044] In another embodiment provided by the present invention, the roller support assembly 64 is stepped and mirror-distributed on the slide 62. When the roller support assembly 64 is subjected to the pressure of the exchange workbench 4, the roller support assembly 64 close to the end of the slide 62 first abuts against the guide rail 61. Specifically, the roller support assembly 64 can be moved downward and abut against the guide rail 61 under the pressure of the exchange workbench 4 and the workpiece. During the clamping stage of the exchange workbench 4, the number of roller support assemblies 64 abutting against the guide rail 61 can be adaptively adjusted according to the weight of the exchange workbench 4 and the workpiece. As the number of workpieces increases, the number of abutments of the roller support assembly 64 gradually increases. Under the pressure of the exchange workbench 4, the roller support assembly 64 gradually abuts against the guide rail 61 from the end to the middle position, ensuring that the exchange workbench 4 can always be stably supported.

[0045] In another embodiment provided by the present invention, the guide mechanism 6 also includes a connecting frame 63, which is fixedly installed on the bottom of the exchange workbench 4, and is used to connect the roller support assembly 64 and the exchange workbench 4. Specifically, the connection between the roller support assembly 64 and the exchange workbench 4 is achieved by setting the connecting frame 63, and space for the top end of the roller support assembly 64 to move is reserved in the connecting frame 63.

[0046] In another embodiment provided by the present invention, as the preferred technical solution of this embodiment, the roller support assembly 64 includes a mounting bracket 641, a top end of which is inserted into the connecting frame 63, and a bottom end of which is inserted into the sliding seat 62. The external movable sleeve of the mounting bracket 641 is provided with a compression spring 642, a top end of which abuts against the bottom of the connecting frame 63 and can continuously apply elastic force to the mounting bracket 641. Specifically, the external fixed sleeve of the mounting bracket 641 is provided with a limiting ring 643 located below the compression spring 642. The exchange workbench 4 applies pressure to the connecting frame 63 and the compression spring 642, and the limiting ring 643 limits and drives the mounting bracket 641 to move downward as a whole, so that the support roller 644 at the bottom of the mounting bracket 641 can abut against the guide rail 61, and the exchange workbench 4 is supported by the roller support assembly 64 abutting against the guide rail 61.

[0047] In another embodiment provided by the present invention, the roller support assembly 64 also includes a support roller 644, which is movably and horizontally installed at the bottom of the mounting bracket 641, and the axis of the mounting bracket 641 is perpendicular to the moving direction of the slide 62. Specifically, after the mounting bracket 641 is moved downward by the pressure of the exchange workbench 4 so that the support roller 644 abuts against the guide rail 61, the exchange workbench 4 can be supported by the support roller 644 and the mounting bracket 641 that have moved down into place, and when the exchange workbench 4 moves, the support roller 644 can roll on the top of the guide rail 61 to reduce friction.

[0048] In another embodiment provided by the present invention, the oil supply assembly 66 is arranged at the bottom of the mounting bracket 641, and the oil supply assembly 66 is transmission-connected with the support roller 644 at the bottom of the mounting bracket 641. The number of oil supply assemblies 66 arranged at the bottom of the mounting bracket 641 is not less than one group. Specifically, the oil supply assembly 66 is transmission-connected with the support roller 644. When the support roller 644 moves against the guide rail 61, the rotation of the support roller 644 can drive the oil supply assembly 66 to work. The oil supply assembly 66 can drive the lubricating oil to circulate in the cavity of the slide seat 62, lubricate the contact position between the slide seat 62 and the guide rail 61, and drive the lubricating oil to flow. Due to the heat generated by friction, and as the number of abutments of the roller support assembly 64 increases, the number of interventions of the oil supply assembly 66 increases to increase the flow rate of the lubricating oil under high load conditions; an oil storage tank is provided at the bottom of the exchange workbench 4 for storing the lubricating oil, and the oil storage tank is connected to the internal cavity of the slide 62 through an oil pipe, and an oil pipe is connected to the oil inlet of the oil supply assembly 66, and the oil pipe extends along the side wall of the slide 62 to the outside and is connected to the oil storage tank, and the oil outlet of the oil supply assembly 66 is in an open state to achieve communication with the internal cavity of the slide 62, and when the oil supply assembly 66 is working, it drives the lubricating oil to circulate in the oil storage tank, the pipeline and the cavity.

[0049] In another embodiment of the present invention, after the support roller 644 abuts against the top of the guide rail 61, the distance between the bottom of the oil supply assembly 66 and the top of the guide rail 61 is not less than 5 mm. Specifically, the bottom position of the oil supply assembly 66 is restricted to avoid friction between the bottom of the oil supply assembly 66 and the top of the guide rail 61 after the support roller 644 abuts against the top of the guide rail 61; since the slide 62 needs to move bidirectionally on the guide rail 61, the support roller 644 will rotate bidirectionally when working, so the oil supply assembly 66 needs to meet the two-way lubrication of the lubricating oil. For the delivery of lubricating oil, the oil supply component 66 can select a gear pump, a cam pump or a rotary vane pump. The oil supply component 66 in the present application is a gear pump, including a micro pump housing 661 and two sets of oil pumping gears 662. The micro pump housing 661 is fixedly mounted on the bottom of the mounting bracket 641, and the two sets of oil pumping gears 662 are movably mounted inside the micro pump housing 661 and mesh with each other. Any oil pumping gear 662 is fixedly connected to the support roller 644. When the support roller 644 rotates, it drives the two sets of oil pumping gears 662 to rotate, thereby realizing the delivery of lubricating oil.

[0050] In another embodiment provided by the present invention, the inner wall of the slide 62 contacts the outer wall of the guide rail 61, and sealing baffles 67 are fixedly installed at both ends of the slide 62. The slide 62 can form a sealed cavity inside it through the sealing baffles 67. Specifically, the lower part of the inner wall of the slide 62 contacts the guide rail 61, and the two can be contact-sealed, and the sealing baffle 67 is provided on the slide 62, so that a relatively sealed cavity can be formed inside the slide 62 to avoid leakage of lubricating oil.

[0051] It can be seen from the above embodiments that after a number of roller support assemblies 64 are adaptively adjusted according to the exchange worktable 4 and the number of workpieces, the exchange worktable 4 and the slide 62 are in an unlocked state. In order to ensure the stability of the exchange worktable 4 during subsequent processing, the following embodiments are proposed to solve this problem.

[0052] In an embodiment provided by the present invention, the guide mechanism 6 also includes a locking assembly 65, which includes a locking screw 651, which is rotatably connected to the bottom of the exchange workbench 4 and is spirally connected to the mounting bracket 641. When the mounting bracket 641 moves up and down, the locking screw 651 can rotate. Specifically, the locking screw 651 is fixedly connected to the output shaft of the bidirectional adjustable ratchet 652, and the direction of rotation of the output shaft of the bidirectional adjustable ratchet 652 is changed by the reversing part to limit the rotation direction of the locking screw 651, so as to meet the pressure downward movement operation of the mounting bracket 641, and the subsequent reset operation of the mounting bracket 641 under the action of the elastic force of the compressed spring 642 when the workpiece is removed.

[0053] In one embodiment provided by the present invention, the locking assembly 65 also includes a reversing portion, which is arranged on both sides of the roller support assembly 64 and is used to adjust the allowable rotation direction of the locking screw 651. Specifically, the reversing portion includes a bidirectionally adjustable ratchet 652, a transmission push rod 653, a transmission rack 654 and a shifting electric push rod 7. The bidirectionally adjustable ratchet 652 is a prior art and is fixedly installed at the bottom of the exchange workbench 4. In the prior art, a lever is provided on the bidirectionally adjustable ratchet 652 for adjusting the rotation direction of its output shaft. In the present application, the lever is replaced by a transmission gear. The rack 654 cooperates with the transmission gear to adjust the rotation direction of the output shaft of the bidirectional adjustable ratchet 652; the shifting electric push rod 7 is fixedly installed on the workbench base 2, and a shift fork is provided on the output shaft of the shifting electric push rod 7. After the exchange workbench 4 moves to the top of the workbench base 2, the transmission push rod 653 can be correspondingly engaged in the shift fork. The shifting electric push rod 7 drives the transmission push rod 653 and the transmission rack 654 to move through the shift fork, and then drives the transmission gear to rotate, so as to adjust the rotation direction of the output shaft of the bidirectional adjustable ratchet 652; if the exchange workbench 4 applies pressure to the mounting bracket 641 The gravity mounting bracket 641 needs to drive the locking screw 651 to rotate clockwise to achieve position adjustment. When the exchange table 4 is at the top of the exchange table base 3, the locking screw 651 is limited to rotate clockwise by the bidirectional adjustable ratchet 652. At this time, the mounting bracket 641 is pressed and cannot move downward. When the exchange table 4 moves to the top of the table base 2, the shifting electric push rod 7 drives the transmission push rod 653 and the transmission rack 654 to move through the shift fork, and the transmission gear is driven to adjust the output shaft of the bidirectional adjustable ratchet 652 to a state where it can rotate clockwise. At this time, the roller support assembly 64 is pressed by the exchange table 4. The gravity of the workbench 4 is adaptively adjusted, and at this time the locking screw 651 can only rotate clockwise, limiting the counterclockwise rotation of the locking screw 651, thereby ensuring the stability of the mounting bracket 641 after adaptive adjustment, and further ensuring the stability of the exchange workbench 4 during processing. When the exchange workbench 4 is processed and moved back to the workbench base 2, the shifting electric push rod 7 adjusts the bidirectional adjustable ratchet 652 to only rotate counterclockwise. At this time, the locking screw 651 moves to the top of the exchange table base 3 and can rotate counterclockwise, so that the mounting bracket 641 can be reset by the elastic force of the compressed spring 642.

[0054] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A bridge-type five-axis gantry machining center with an automatic exchange table, comprising a worktable base (2) and an exchange table base (3), wherein a exchange table (4) capable of docking with the worktable base (2) is arranged on the top of the exchange table base (3), characterized in that: It also includes a guide mechanism (6) which is arranged between the exchange table base (3) and the exchange workbench (4), and includes a guide rail (61), a slide seat (62) slidably arranged on the guide rail (61), a roller support assembly (64) arranged in a stepped manner on the slide seat (62), and an oil supply assembly (66) for driving lubricating oil to circulate in the slide seat (62); The roller support assembly (64) can abut against the top of the guide rail (61) under the pressure of the exchange workbench (4), and the abutment amount of the roller support assembly (64) can be adaptively adjusted according to the weight of the exchange workbench (4) during the clamping stage of the exchange workbench (4); the oil supply assembly (66) is transmission-arranged on the roller support assembly (64), and when the oil supply assembly (66) abuts against the guide rail (61) and moves, it can drive the oil supply assembly (66) to work and transport lubricating oil.

2. A bridge-type five-axis gantry machining center with an automatic exchange table according to claim 1, characterized in that: The roller support assembly (64) is stepped and mirror-distributed on the slide (62). When the roller support assembly (64) is subjected to pressure from the exchange workbench (4), the roller support assembly (64) close to the end of the slide (62) first abuts against the guide rail (61).

3. A bridge-type five-axis gantry machining center with an automatic exchange table according to claim 1, characterized in that: The guide mechanism (6) also includes a connecting frame (63), which is fixedly mounted on the bottom of the exchange workbench (4) and is used to connect the roller support assembly (64) and the exchange workbench (4).

4. A bridge-type five-axis gantry machining center with an automatic exchange table according to claim 3, characterized in that: The roller support assembly (64) includes a mounting bracket (641), the top end of which is inserted into the connecting frame (63) and the bottom end of which is inserted into the sliding seat (62). The external movable sleeve of the mounting bracket (641) is provided with a compression spring (642), the top end of which abuts against the bottom of the connecting frame (63) and can continuously apply elastic force to the mounting bracket (641).

5. The bridge-type five-axis gantry machining center with an automatic exchange table according to claim 1, characterized in that: The roller support assembly (64) further comprises a support roller (644) which is movably and horizontally mounted on the bottom of a mounting bracket (641), wherein the axis of the mounting bracket (641) is perpendicular to the moving direction of the slide seat (62).

6. A bridge-type five-axis gantry machining center with an automatic exchange table according to claim 5, characterized in that: The oil supply assembly (66) is arranged at the bottom of the mounting bracket (641), and the oil supply assembly (66) is drivingly connected to the support roller (644) at the bottom of the mounting bracket (641). The number of the oil supply assembly (66) arranged at the bottom of the mounting bracket (641) is not less than one group.

7. A bridge-type five-axis gantry machining center with an automatic exchange table according to claim 6, characterized in that: After the support roller (644) abuts against the top of the guide rail (61), the distance between the bottom of the oil supply assembly (66) and the top of the guide rail (61) is not less than 5 mm.

8. The bridge-type five-axis gantry machining center with an automatic exchange table according to claim 1, characterized in that: The inner wall of the slide seat (62) contacts the outer wall of the guide rail (61), and sealing baffles (67) are fixedly mounted on both ends of the slide seat (62). The slide seat (62) can form a sealed cavity inside thereof through the sealing baffles (67).

9. The bridge-type five-axis gantry machining center with an automatic exchange table according to claim 1, characterized in that: The guide mechanism (6) further comprises a locking assembly (65), wherein the locking assembly (65) comprises a locking screw (651), which is rotatably connected to the bottom of the exchange workbench (4) and is spirally connected to the mounting bracket (641). When the mounting bracket (641) moves up and down, the locking screw (651) can rotate.

10. A bridge-type five-axis gantry machining center with an automatic exchange table according to claim 9, characterized in that: The locking assembly (65) further comprises a reversing portion, which is arranged on both sides of the roller support assembly (64) and is used to adjust the allowed rotation direction of the locking screw (651).

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