A CNC gantry milling machine convenient for clamping workpieces

Abstract

The invention discloses a CNC gantry milling machine which is convenient for clamping workpieces, mainly relates to the technical field of gantry milling machines, comprises a machine tool itself, a body platform, and a fixture base installed on the body platform, a fixture middle seat is rotatably provided on the fixture base, a fixture top platform is slidably installed on the fixture middle seat, the fixture top platform is respectively provided with a direct-connected clamping jaw and a secondary-connected clamping jaw, and is also provided with two centrosymmetrical eccentric clamping jaws; the invention can conveniently clamp and fix the workpiece, and can also provide a variety of angles required for processing.

Description

Technical Field

[0001] The invention mainly relates to the technical field of gantry milling machines, and in particular to a numerically controlled gantry milling machine which is convenient for clamping workpieces. Background Art

[0002] The gantry milling machine consists of two parts, one part is the frame and the other part is a milling machine with a long bed. It is mainly used for batch processing of large workpieces, and the processing is generally aimed at processing the plane of the workpiece and a part of the inclined surface. In the prior art, when processing parts, manual matching threads, screws and fixing plates are used to fix the parts on the machine tool. Once the sizes of the parts are different, such as parts of different lengths and widths, the fixing plate must be removed and reinstalled each time, which is very inconvenient to use.

[0003] There are also some technologies in the prior art that can adapt to different lengths and widths. Although these devices can facilitate the clamping of workpieces to a certain extent, these devices cannot automatically adjust the length and width of the fixture to adapt to the size of the parts. Manual adjustment is still required. Moreover, since the workpiece needs to be processed on a bevel, these devices cannot adjust the angle of the workpiece. The workpiece can only be fixed on the machine tool like a traditional fixation, which is still inconvenient to use. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned problems, the present invention needs to provide a CNC gantry milling machine that is convenient for clamping workpieces, can adapt to different part sizes, fix the workpieces, and can provide a variety of angles required for processing.

[0006] (II) Technical solution

[0007] In view of the above technical problems, the present invention provides a CNC gantry milling machine which is convenient for clamping workpieces, including the machine tool itself and a body platform, wherein a clamp base is fixedly installed on the body platform, a clamp middle seat is rotatably installed on the clamp base, a scale is provided on the clamp middle seat, a clamp top platform is slidably installed on the clamp middle seat, symmetrical direct-connected jaws and secondary-connected jaws are slidably provided on the clamp top platform, the direct-connected jaws and secondary-connected jaws are used to fix two symmetrical edges of the workpiece, and two eccentric jaws are also centrally symmetrically provided on the clamp top platform, the two eccentric jaws are used to fix the other two symmetrical edges of the workpiece.

[0008] Furthermore, the middle seat of the clamp includes arc-shaped seats at both ends, and the arc-shaped seats at both ends are connected by an arc-shaped plate. A gear assembly is arranged at the bottom of the arc-shaped plate, and an arc-shaped worm gear is connected to the arc-shaped plate. An angle worm gear is rotatably arranged on the top platform of the clamp. The arc-shaped worm gear and the angle worm gear form a worm gear and a worm gear which cooperate to drive the tilt angle of the top platform of the clamp.

[0009] Furthermore, a pointer is provided on the top platform of the clamp, and an angle slider is connected to the bottom of the top platform of the clamp. The angle slider slides in the arc seat, and an auxiliary cylinder is respectively provided on the four corners of the top platform of the clamp and is hinged to the middle seat of the clamp.

[0010] Furthermore, two axially symmetrical straight slide grooves are provided on the top platform of the clamp, and the direct-connected clamping jaw and the secondary-connected clamping jaw are slidably installed in the two straight slide grooves respectively. A direct-drive cylinder is fixedly installed on the bottom of the top platform of the clamp, and the movable end of the direct-drive cylinder is fixedly connected to the direct-connected clamping jaw. A direct-connected rack is welded on the direct-connected clamping jaw, and the direct-connected rack is meshed with the center gear. A secondary-connected rack is meshed on the other side of the center gear, and the top of the secondary-connected rack is welded to the secondary-connected clamping jaw.

[0011] Furthermore, the first thickness gear and the second thickness gear are respectively meshed on both sides of the central gear, and the first thickness gear and the second thickness gear are each rotatably connected to a group of elastic rods, each group of elastic rods is connected to a group of trigger components, and the two groups of trigger components are centrally symmetrical, and the two groups of trigger components respectively control the two eccentric clamps to slide on the special-shaped rotating frame.

[0012] Furthermore, the elastic rod includes a clamping gear, which is fixedly mounted on the clamping shaft. The second thickness gear and the first thickness gear are respectively rotatably connected to the clamping shaft. A tension spring is wound and fixedly mounted on the clamping gear. The end of the tension spring extends upward and is fixedly connected to the top platform of the clamp. The bottom of the clamping shaft is n-shaped, and a cylinder is fixedly connected between the two sides of the n-shape. The cylinder is slidably connected to the adjustment connecting rod in the trigger assembly.

[0013] Furthermore, the special-shaped rotating frame is rotatably mounted on the top platform of the fixture, and a special-shaped frame gear is fixedly connected to the bottom center point of the special-shaped rotating frame, and the special-shaped frame gear forms a gear match with the first thickness gear and the second thickness gear on both sides; the special-shaped rotating frame includes an inclined rod, and two sliding grooves are symmetrically arranged at the center of the two ends of the inclined rod.

[0014] Furthermore, the trigger assembly also includes a long slide frame, a slide frame spring is provided between the bottom of the long slide frame and the top platform of the clamp, a support plate is provided on one side of the long slide frame and is hinged with an adjusting connecting rod, a long round rod is slidably connected to the long slide frame, the long round rod is fixedly mounted on the short connecting rod, the center position of the short connecting rod is rotatably connected to the eccentric clamping claw, a short cylinder is provided on the other side of the short connecting rod, the short cylinder is slidably mounted on a slide plate, the slide plate is fixedly connected to the connecting rod, and the connecting rod is fixedly mounted on the inner clamping claw.

[0015] Furthermore, connecting rods are provided on both sides of the inner clamping jaw, and the two connecting rods slide on the eccentric clamping jaw. An inner spring is also provided between each connecting rod and the eccentric clamping jaw.

[0016] Furthermore, a reset cylinder is provided below each adjusting connecting rod, the two reset cylinders are centrally symmetrical, and the movable ends of the reset cylinders are in contact with the adjusting connecting rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention is provided with a clamp intermediate seat, a gear assembly, a clamp top platform, an angle worm, and an arc worm gear, which can rotate the orientation of the parts and adjust the tilt angle to meet the processing needs of different orientations and different angles, and improve the disadvantage that the traditional clamp can only fix the workpiece on the machine tool, and is also provided with a pointer and a scale to know the tilt angle, and provides auxiliary stable support of an auxiliary cylinder when rotating the orientation; 2. The clamp top platform of the present invention is provided with a direct-connected clamp, a secondary-connected clamp, a direct-drive cylinder, a direct-connected rack, a secondary-connected rack, and a center gear, which can drive the two clamps to slide at the same time to clamp and fix the workpiece, and the present invention is also provided with a special-shaped rotating frame, a special-shaped frame gear, an eccentric clamp, an elastic rod, and a trigger assembly When the center gear rotates, the first thickness gear and the second thickness gear can be used to drive the special-shaped rotating frame to rotate, thereby driving the two eccentric clamping jaws to slide relative to each other, and clamping and fixing the other two sides of the workpiece (the two length sides of the workpiece). Due to the provision of a trigger component, after the inner clamping jaw contacts the workpiece, the elastic rod will be activated to keep the special-shaped rotating frame stationary. The length side of the workpiece is clamped and fixed first, and then the direct-connected clamping jaw and the secondary-connected clamping jaw are clamped on the two width sides of the workpiece under the action of the direct-drive cylinder. The two sides are clamped first, and then the other two sides are clamped. In this way, it can adapt to parts with different lengths and widths. Whether it is a square or rectangular part, it can be fixed in this way. When facing other square parts, it can also be clamped directly without changing the fixture, and the clamping is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the first angle of the present invention for hiding the machine tool itself and the fuselage platform.

[0020] Figure 3 It is a partial first angle schematic diagram of the clamp mechanism of the present invention.

[0021] Figure 4 for Figure 3 Section view at AA in the middle.

[0022] Figure 5 It is a partial bottom view of the clamp mechanism of the present invention.

[0023] Figure 6 It is a partial top view of the clamp mechanism of the present invention.

[0024] Figure 7 It is a partial second angle schematic diagram of the clamp mechanism of the present invention.

[0025] Figure 8 for Figure 7 Cross-sectional view at BB in the middle.

[0026] Fig. 9 for Figure 7 Sectional view at CC.

[0027] Fig.10 for Figure 8 A partial enlarged schematic diagram of point A1 in the middle.

[0028] Fig.11 It is a partial third angle schematic diagram of the clamp mechanism of the present invention.

[0029] Fig.12 for Fig.11 Sectional view at DD in the middle.

[0030] Fig.13 It is a partial schematic diagram of the clamp mechanism of the present invention from the fourth angle.

[0031] Fig.14 It is a partial fifth angle schematic diagram of the clamp mechanism of the present invention.

[0032] Fig.15 It is a partial sixth angle schematic diagram of the clamp mechanism of the present invention.

[0033] Fig.16 It is a partial seventh angle schematic diagram of the clamp mechanism of the present invention.

[0034] Fig.17 It is a partial eighth angle schematic diagram of the clamp mechanism of the present invention.

[0035] Fig.18 It is a schematic diagram of the eccentric clamping jaw of the present invention.

[0036] Figure numbers: 1-clamp mechanism; 101-gantry; 102-drill; 103-fuselage platform; 104-clamp base; 105-clamp top platform; 106-auxiliary cylinder; 107-clamp middle seat; 108-threaded hole; 109-base gear ring; 110-azimuth gear; 111-azimuth motor; 112-arc worm gear; 113-scale; 114-angle slider; 115-pointer; 116-arc slide; 117-angle belt; 118-angle worm; 119-angle wheel; 120-angle motor; 121-connecting hole; 122-connecting ring; 123-direct rack; 124-direct clamping claw; 125-straight drive cylinder; 126-straight slide; 127-eccentric slide; 128-eccentric clamp; 129-secondary connecting clamp; 130-secondary connecting rack; 131-first thickness gear; 132-fixed shaft; 133-special-shaped rotating frame; 134-tension spring; 135-clamping gear; 136-clamping shaft; 137-second thickness gear; 138-adjusting connecting rod; 139-special-shaped frame gear; 140-center gear; 141-long slide frame; 142-slide frame spring; 143-reset cylinder; 144-long round rod; 145-short connecting rod; 146-plate with slide; 147-connecting rod; 148-inner clamp; 149-inner spring. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with specific embodiments. The present invention is explained by means of the illustrative embodiments and descriptions of the present invention, but is not intended to be limiting of the present invention.

[0038] Example: Figure 1-Figure 18 A CNC gantry milling machine convenient for clamping workpieces is shown, including a clamp mechanism 1, the clamp mechanism 1 includes the machine tool itself, the machine tool itself is specifically composed of a gantry 101 and a drill bit 102, the gantry 101, the drill bit 102, and the fuselage platform 103 constitute a milling machine in the prior art, a clamp base 104 is fixedly installed on the fuselage platform 103, the four corners of the clamp base 104 are provided with threaded holes 108, and the clamp base 104 can be fixedly installed on the fuselage platform 103 by screws.

[0039] The middle seat 107 of the clamp includes arc seats at both ends, and the arc seats at both ends are connected by an arc plate. A gear assembly is arranged at the bottom of the arc plate, and is rotatably mounted on the clamp base 104 by the gear assembly. The gear assembly specifically includes an azimuth gear 110, and the azimuth gear 110 is fixedly mounted on the output shaft of the azimuth motor 111, and the azimuth motor 111 is fixedly mounted on the arc plate. The base gear ring 109 is fixedly mounted on the clamp base 104, and the azimuth gear 110 forms a gear match with the base gear ring 109.

[0040] An arc-shaped worm gear 112 is fixedly connected to the arc-shaped plate, an angle worm 118 is rotatably provided on the clamp top platform 105, an angle motor 120 is also fixedly installed on the clamp top platform 105, an angle wheel 119 is fixedly installed on the output shaft of the angle motor 120, another angle wheel 119 is fixedly installed on the angle worm 118, an angle belt 117 is sleeved on the two angle wheels 119, and the arc-shaped worm gear 112 and the angle worm 118 form a worm gear that cooperates to drive the clamp top platform 105 to tilt at an angle.

[0041] A pointer 115 is provided on the fixture top platform 105, and a scale 113 is provided on the arc seat of the fixture middle seat 107. The pointer 115 and the scale 113 determine the inclination angle. A connecting hole 121 is provided at the bottom of the fixture top platform 105, and an angle slider 114 is fixedly connected to the connecting hole 121. The angle slider 114 is specifically a slider, and a cylinder is vertically fixedly connected to the slider, and the cylinder passes through the slider. The upper end of the cylinder is fixedly connected in the connecting hole 121, and the lower end of the cylinder and the slider are below the arc slot 116. The angle slider 114 slides in the arc slot 116 of the arc seat. An auxiliary cylinder 106 is provided on each of the four corners of the fixture top platform 105 and is hinged to the fixture middle seat 107. The movable end of the auxiliary cylinder 106 is hinged to the connecting ring 122 of the drill bit 102, and the end of the auxiliary cylinder 106 is hinged to the fixture middle seat 107.

[0042] Two axially symmetrical straight grooves 126 are provided on the clamp top platform 105, and the direct-connected clamping jaw 124 and the secondary-connected clamping jaw 129 are respectively slidably installed in the two straight grooves 126. A direct-drive cylinder 125 is fixedly installed at the bottom of the clamp top platform 105, and the movable end of the direct-drive cylinder 125 is fixedly connected to the direct-connected clamping jaw 124, and the end of the direct-drive cylinder 125 is fixedly installed on the clamp top platform 105. A direct-connected rack 123 is welded to the direct-connected clamping jaw 124, and the direct-connected rack 123 is meshed with the center gear 140. The center gear 140 is rotatably installed on the clamp top platform 105, and the other side of the center gear 140 is meshed with a secondary-connected rack 130, and the top of the secondary-connected rack 130 is welded to the secondary-connected clamping jaw 129.

[0043] The first thickness gear 131 and the second thickness gear 137 are respectively meshed on both sides of the central gear 140. The first thickness gear 131 and the second thickness gear 137 are rotatably connected to a group of elastic rods. Each group of elastic rods is connected to a group of trigger assemblies. The two groups of trigger assemblies are symmetrical about the center. The two groups of trigger assemblies respectively control the two eccentric clamping claws 128 to slide on the special-shaped rotating frame 133.

[0044] Two eccentric sliding grooves 127 are symmetrically arranged on the clamp top platform 105 , and an eccentric clamping claw 128 slides in each eccentric sliding groove 127 , and the two eccentric clamping claws 128 are symmetrically arranged on the center.

[0045] The elastic rod includes a clamping gear 135, which is fixedly mounted on a clamping shaft 136. The second thickness gear 137 and the first thickness gear 131 are rotatably connected to their respective corresponding clamping shafts 136. A tension spring 134 is wound and fixedly mounted on the clamping gear 135. The end of the tension spring 134 extends upward and is fixedly connected to the fixture top platform 105. The bottom of the clamping shaft 136 is n-shaped, and a cylinder is fixedly connected between the two sides of the n-shape. The cylinder is slidably connected to the adjustment connecting rod 138 in the trigger assembly.

[0046] The special-shaped rotating frame 133 is rotatably mounted on the fixed shaft 132 fixedly set on the fixture top platform 105, and the bottom center point of the special-shaped rotating frame 133 is fixedly connected to the special-shaped frame gear 139, and the special-shaped frame gear 139 forms a gear match with the first thickness gear 131 and the second thickness gear 137 on both sides; the special-shaped rotating frame 133 includes a tilting rod, and two sliding grooves are symmetrically provided at the center of the two ends of the tilting rod.

[0047] The trigger assembly also includes a long slide frame 141, a slide frame spring 142 is provided between the bottom of the long slide frame 141 and the clamp top platform 105, two spaced short cylinders are provided at the bottom of the long slide frame 141, and two spaced circular grooves are provided on the clamp top platform 105, each short cylinder corresponds to each circular groove, and a slide frame spring 142 is provided between each short cylinder and the circular groove, one end of the slide frame spring 142 is fixedly connected to the short cylinder, and the other end is fixedly connected in the circular groove, and a support plate is provided on one side of the long slide frame 141 and is hinged to the adjustment connecting rod 138.

[0048] A long round rod 144 is slidably connected to the long slide frame 141, and the long round rod 144 is fixedly mounted on the short connecting rod 145. The center position of the short connecting rod 145 is rotatably connected to the side of the eccentric clamping jaw 128. A short cylinder is provided on the other side of the short connecting rod 145, and the short cylinder is slidably mounted on a slide plate 146. The slide plate 146 is fixedly connected to a connecting rod 147, and the connecting rod 147 is fixedly mounted on the inner clamping jaw 148.

[0049] Connecting rods 147 are provided on both sides of the inner clamping jaw 148. The two connecting rods 147 slide on the eccentric clamping jaw 128. An inner spring 149 is also provided between each connecting rod 147 and the eccentric clamping jaw 128. One end of the inner spring 149 is fixedly installed on the connecting rod 147, and the other end is fixedly installed on the eccentric clamping jaw 128.

[0050] An opening is provided in the middle of the eccentric clamping jaw 128, and the opening is used for the inner clamping jaw 148 to slide. Horizontal sliding grooves are provided on both sides, and the horizontal sliding grooves are used for the connecting rod 147 to slide. A cylinder is fixed at the bottom, and the cylinder at the bottom slides in the sliding groove of the special-shaped rotating frame 133. A hinge point is provided on the side, and the hinge point on the side is used to be hinged with the short connecting rod 145.

[0051] A reset cylinder 143 is also provided below each adjusting link 138 . The two reset cylinders 143 are symmetrical with respect to the center. The movable ends of the reset cylinders 143 are in contact with the adjusting link 138 . The reset cylinders 143 are fixedly mounted on the fixture top platform 105 .

[0052] Working principle of the present invention: In the initial state of the present invention, the direct-connected jaw 124, the secondary-connected jaw 129 and the two eccentric jaws 128 are in an open state. At this time, the workpiece is placed on the fixture top platform 105, and then the switch is pressed to start the direct-drive cylinder 125. The movable end of the direct-drive cylinder 125 drives the direct-connected jaw 124 to slide, and under the action of the direct-connected rack 123, the center gear 140 is driven to rotate, and the center gear 140 drives the secondary-connected rack 130 to rotate, and the secondary rack 130 drives the secondary-connected jaw 129 to slide, so that the direct-connected jaw 124 and the secondary-connected jaw 129 move closer to each other and close to the two symmetrical sides of the part.

[0053] During the rotation of the above-mentioned central gear 140, it will also mesh with the first thickness gear 131 and the second thickness gear 137. The first thickness gear 131 and the second thickness gear 137 are meshed with the special-shaped frame gear 139, thereby driving the special-shaped rotating frame 133 to rotate. When the special-shaped rotating frame 133 rotates, it drives the eccentric clamping claws 128 on both sides to slide. Since the inner clamping claw 148 is installed on the eccentric clamping claw 128, it slides with the eccentric clamping claw 128. After the inner clamping claw 148 contacts the part, during the continued rotation of the special-shaped rotating frame 133, it will push the inner clamping claw 148, the connecting rod 147, and the plate with a slide groove 146 to slide backward, and the inner spring 149 is compressed.

[0054] When the slide plate 146 slides, it drives the short connecting rod 145 to rotate, and then the long round rod 144 on the short connecting rod 145 is lifted. At this time, the long round rod 144 releases the squeeze on the long slide frame 141, and the slide frame spring 142 loses pressure and rebounds. Therefore, the long slide frame 141 will be lifted as a whole. After the long slide frame 141 is lifted, it drives the adjusting connecting rod 138 to rotate. The end of the adjusting connecting rod 138 in contact with the clamping shaft 136 will pull the clamping shaft 136 down. At this time, the tension spring 134 is stretched and the clamping shaft 136 is pulled down. After the tightening shaft 136 descends, the first thickness gear 131 and the second thickness gear 137 will be disengaged from the special-shaped frame gear 139, and the two clamping gears 135 will descend to the same plane height as the special-shaped frame gear 139, clamping the special-shaped frame gear 139 on both sides of the special-shaped frame gear 139, so that the special-shaped frame gear 139 and the special-shaped rotating frame 133 on the special-shaped frame gear 139 remain different. At this time, the two symmetrical sides of the workpiece have been fixed by two center-symmetrical eccentric clamping jaws 128.

[0055] Then, when the direct-drive cylinder 125 continues to work, the direct-connection clamping jaw 124 and the secondary-connection clamping jaw 129 slide to the other two sides of the workpiece, and the direct-drive cylinder 125 is stopped after fixing the two sides of the part.

[0056] After being fixed, the drill bit 102 can be used to process the parts. During processing, the azimuth motor 111 can be started to drive the azimuth gear 110 to rotate. With the cooperation of the base gear ring 109, the overall orientation of the parts can be driven to change to meet the processing needs. The angle motor 120 can also be started to make the arc worm gear 112 cooperate with the angle worm 118 to change the inclination angle of the fixture top platform 105, so as to process different inclined surfaces. When the fixture top platform 105 slides along the shape of the fixture middle seat 107, the inclination angle can be known by the indication position of the pointer 115 on the angle slider 114.

[0057] In addition, when tilting the fixture top platform 105, it is necessary to start four auxiliary cylinders 106 to cooperate with the adjustment and provide stable support for the fixture top platform 105. The above method of the present invention can fix the workpieces one after the other, adapt to parts with different lengths and widths, and can adapt to the length and width of the parts. When the workpiece processing is completed, start the reset cylinder 143 to lift one end of the adjusting connecting rod 138, and the adjusting connecting rod 138 will drive the clamping shaft 136 to rise, so that the clamping gear 135 is reset, and then start the direct drive cylinder 125 to make the direct-connected clamping jaw 124, the secondary clamping jaw 129 and the eccentric clamping jaw 128 loosen the fixation on the parts, and the parts can be taken out.

[0058] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A CNC gantry milling machine convenient for clamping workpieces, comprising a machine tool itself and a machine body platform (103), wherein a fixture base (104) is fixedly mounted on the machine body platform (103), characterized in that: A clamp middle seat (107) is rotatably mounted on the clamp base (104), a scale (113) is provided on the clamp middle seat (107), a clamp top platform (105) is slidably mounted on the clamp middle seat (107), symmetrical direct-connected clamping jaws (124) and secondary-connected clamping jaws (129) are slidably provided on the clamp top platform (105), the direct-connected clamping jaws (124) and the secondary-connected clamping jaws (129) are used to fix two symmetrical sides of a workpiece, and two eccentric clamping jaws (128) are also centrally symmetrically provided on the clamp top platform (105), the two eccentric clamping jaws (128) are used to fix the other two symmetrical sides of the workpiece; The clamp middle seat (107) includes arc seats at both ends, the arc seats at both ends are connected by an arc plate, a gear assembly is arranged at the bottom of the arc plate, an arc worm wheel (112) is connected to the arc plate, an angle worm (118) is rotatably arranged on the clamp top platform (105), and the arc worm wheel (112) and the angle worm wheel (118) form a worm gear to cooperate with each other to drive the clamp top platform (105) to tilt at an angle; A pointer (115) is provided on the fixture top platform (105), an angle slider (114) is connected to the bottom of the fixture top platform (105), the angle slider (114) slides in the arc seat, and an auxiliary cylinder (106) is respectively provided on the four corners of the fixture top platform (105) and is hinged to the fixture middle seat (107); The clamp top platform (105) is provided with two axially symmetrical straight grooves (126), the direct-connected clamping jaw (124) and the secondary-connected clamping jaw (129) are respectively slidably installed in the two straight grooves (126), a direct-drive cylinder (125) is fixedly installed at the bottom of the clamp top platform (105), the movable end of the direct-drive cylinder (125) is fixedly connected to the direct-connected clamping jaw (124), a direct-connected rack (123) is welded to the direct-connected clamping jaw (124), the direct-connected rack (123) is meshed with the center gear (140), the other side of the center gear (140) is meshed with the secondary-connected rack (130), and the top of the secondary-connected rack (130) is welded to the secondary-connected clamping jaw (129); The central gear (140) is also meshed with a first thickness gear (131) and a second thickness gear (137) on both sides, respectively. The first thickness gear (131) and the second thickness gear (137) are rotatably connected to a group of elastic rods, each group of elastic rods is connected to a group of trigger components, and the two groups of trigger components are symmetrical about the center. The two groups of trigger components respectively control the two eccentric clamping claws (128) to slide on the special-shaped rotating frame (133); The elastic rod comprises a clamping gear (135), the clamping gear (135) is fixedly mounted on the clamping shaft (136), the second thickness gear (137) and the first thickness gear (131) are respectively rotatably connected to the clamping shaft (136), a tension spring (134) is wound and fixedly mounted on the clamping gear (135), the end of the tension spring (134) extends upward and is fixedly connected to the fixture top platform (105), the bottom of the clamping shaft (136) is n-shaped, a cylinder is fixedly connected between the two sides of the n-shape, and the cylinder is slidably connected to the adjustment connecting rod (138) in the trigger assembly; The trigger assembly also includes a long slide frame (141), a slide frame spring (142) is provided between the bottom of the long slide frame (141) and the clamp top platform (105), a support plate is provided on one side of the long slide frame (141) and is hinged to the adjustment connecting rod (138), a long round rod (144) is slidably connected to the long slide frame (141), the long round rod (144) is fixedly mounted on the short connecting rod (145), the center position of the short connecting rod (145) is rotatably connected to the eccentric clamping claw (128), a short cylinder is provided on the other side of the short connecting rod (145), the short cylinder is slidably mounted on the slide plate (146), the slide plate (146) is fixedly connected to the connecting rod (147), and the connecting rod (147) is fixedly mounted on the inner clamping claw (148); The special-shaped rotating frame (133) is rotatably mounted on the fixture top platform (105); a special-shaped frame gear (139) is fixedly connected to the bottom center point of the special-shaped rotating frame (133); the special-shaped frame gear (139) forms a gear match with the first thickness gear (131) and the second thickness gear (137) on both sides; the special-shaped rotating frame (133) includes a tilting rod, and two sliding grooves are symmetrically arranged at the center of the two ends of the tilting rod.

2. A CNC gantry milling machine that is convenient for clamping workpieces according to claim 1, characterized in that: Connecting rods (147) are provided on both sides of the inner clamping jaw (148). The two connecting rods (147) slide on the eccentric clamping jaw (128). An inner spring (149) is provided between each connecting rod (147) and the eccentric clamping jaw (128).

3. A CNC gantry milling machine for convenient clamping of workpieces according to claim 1, characterized in that: A reset cylinder (143) is also provided below each adjusting connecting rod (138), the two reset cylinders (143) are centrally symmetrical, and the movable ends of the reset cylinders (143) are in contact with the adjusting connecting rod (138).

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