A clamping claw type nut conveying mechanism

Abstract

The invention discloses a clamping claw type nut conveying mechanism, which belongs to the technical field of projection welding. The nut conveying mechanism comprises a main body connecting plate, a nut storing mechanism and a nut grabbing mechanism. The main body connecting plate is used to fix the nut conveying mechanism on a projection welding machine; the nut storing mechanism comprises a nut placing member for storing nuts and a first driving member for driving the nut placing member to move up and down and horizontally; the nut grabbing mechanism comprises a clamping claw member for grabbing nuts and a second driving member for driving the clamping claw member to move up and down and rotate horizontally; the clamping claw member comprises a movable arm, a static arm and a spacing adjusting member for adjusting the spacing between the movable arm and the static arm, and the movable arm and the static arm cooperate to grab the nut. The invention solves the problem that the existing nut conveying mechanism cannot convey nuts of different types, and realizes automatic switching and conveying of different nuts on the same mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of projection welding, and more particularly to a clamping claw type nut conveying mechanism. Background Art

[0002] Projection welding is a common welding method in the current welding industry. It refers to a method in which one or more protrusions are pre-processed on the mating surface of a weldment, which are then contacted with the surface of another weldment and heated by electricity, and then collapsed to form a weld. Projection welding is mainly used to weld small parts such as nuts, studs, washers, etc. to larger stamping parts.

[0003] In common projection welding technology, small parts are usually conveyed to the electrode locating pins by manual placement or nut conveyors. Before the next process, the parts need to be manually projection welded into semi-finished products in advance, and a semi-finished product inventory is established, which has a low degree of integration with other welding processes.

[0004] In existing automated production lines, nuts are usually automatically conveyed by nut conveyors to achieve automated production of projection welding. Traditional nut conveyors are generally vibrating nut conveyors and rotating nut conveyors, and the nut conveyors mainly include a nut screening mechanism and a nut conveying mechanism.

[0005] For production lines with high automation, a handling robot is generally used to carry the parts to be projected welded to the projection welding machine, and the projection welding machine is controlled by a PLC electrical program to realize automated production. However, when the robot performs projection welding, generally one projection welding part is equipped with one projection welding machine, and one nut is equipped with one nut conveyor to realize the automatic conveying of the nut. The handling robot grabs the parts to be projected welded to the positioning pin of the projection welding machine, and the nut conveyor conveys the nut to the positioning pin, starts welding, and the handling robot grabs the parts to the next process, and welds the small parts that need to be welded in turn. In a workstation, the types of nuts that need to be welded are generally equal to the number of nut conveyors and the number of projection welding machines, that is, one projection welding nut is equipped with one nut conveyor and one projection welding machine, or one projection welding machine is equipped with multiple nut conveyors, and multiple nuts are integrated on one projection welding machine for welding. In the prior art, the solution of one nut equipped with one nut conveyor has the following disadvantages when there are many types of nuts to be projected welded:

[0006] 1. The investment cost of nut conveyor equipment is high. If there are many kinds of nuts that need projection welding, multiple equipments are needed to meet the needs of the process;

[0007] 2. Low equipment utilization rate. Since one projection welding machine and conveyor can only correspond to one type of nut, the equipment utilization rate is low;

[0008] 3. The production line occupies a large area. When there are many types of projection welding nuts, the corresponding projection welding equipment will occupy an increased area;

[0009] 4. One type of projection welded nut requires a nut conveyor. When multiple types of nuts are welded on the same projection welder, multiple sets of nut conveying mechanisms need to be installed next to the projection welder. When there are many types of projection welded nuts, due to the limited space around the projection welder, when welding large parts, installing too many nut conveying rods will interfere with the projection welding action of the parts. Summary of the invention

[0010] In view of the deficiencies in the prior art, an object of the present invention is to provide a clamping claw type nut conveying mechanism, which solves the problem that the prior nut conveying mechanism cannot convey nuts of different types.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A clamping claw type nut conveying mechanism comprises a body connecting plate, a nut storage mechanism and a nut grabbing mechanism, wherein the body connecting plate is used to fix the nut conveying mechanism on a projection welding machine;

[0013] The nut storage mechanism comprises a nut placement member for storing nuts and a first driving member for driving the nut placement member to move up and down and horizontally;

[0014] The nut grabbing mechanism comprises a clamping claw member for grabbing the nut and a second driving member for driving the clamping claw member to move up and down and rotate horizontally;

[0015] The clamping jaw member comprises a movable arm, a stationary arm and a spacing adjusting member for adjusting the spacing between the movable arm and the stationary arm. The movable arm and the stationary arm cooperate to grasp the nut.

[0016] Through the above technical solution, the spacing between the movable arm and the static arm is adjusted by the spacing adjustment member, which is convenient for clamping nuts of different types and sizes, and realizes the automatic switching and conveying of different nuts on the same mechanism. Reduce the investment cost of projection welding equipment, integrate multiple nuts on one projection welding equipment for welding, thereby reducing the investment cost of projection welding equipment; improve the utilization rate of projection welding equipment, change the previous projection welding machine that can only correspond to one projection welding nut to one projection welding machine corresponding to multiple nuts, so that the utilization rate of projection welding equipment can be improved; reduce the floor space of the production line, because the number of projection welding equipment and nut conveying equipment can be reduced, the floor space of the production line can be further reduced; eliminate semi-finished product inventory, integrate projection welding with spot welding, and there is no need to establish semi-finished product inventory in advance, eliminating the semi-finished product inventory area. Reduce the labor intensity of operators. In traditional projection welding operations, operators need to grab parts by hand or use manual slings to grab parts to the projection welding equipment. Especially when multiple nuts or multiple nuts need to be welded on large parts, the parts need to be placed in different postures during welding. Solve the problem that nut conveyors cannot be shared and cannot switch to convey different types of nuts.

[0017] It is further preferred that: the nut placement member comprises an outer tube, a fixing block, a connecting block, a positioning bead and an inner tube;

[0018] The inner tube is vertically arranged and accommodated in the outer tube, the nut is sleeved on the surface of the inner tube and is located between the inner tube and the outer tube, the upper part of the outer tube is fixed on the fixing block, the connecting block is located below the outer tube and fixed to the outer side of the outer tube, the positioning bead is located directly below the inner tube and is installed on the connecting block, the positioning bead steel ball is accommodated in the through hole on the bottom surface of the nut, and a spacing is provided between the lower port of the outer tube and the top surface of the connecting block for the nut to be exposed outwardly and detached from the positioning bead steel ball from the side.

[0019] Through the above technical solution, several nuts can be strung on the inner tube, and the bottom nut is positioned by the positioning bead and exposed to the outside through the gap between the lower port of the outer tube and the top surface of the connecting block, so that the movable arm and the static arm can clamp the bottom nut at the gap and grab it to make it detach from the positioning bead. After the bottom nut is detached from the positioning bead, the nuts strung on the inner tube slide downward under the action of gravity, so that the original second to last nut falls on the positioning bead for positioning, and becomes the new bottom nut for the next grab.

[0020] It is further preferred that the spacing is greater than the thickness of the nut and less than twice the thickness of the nut.

[0021] Through the above technical solution, it is easy for the bottom nut to detach from the positioning beads from all sides of the spacing, and it is prevented that the upper nut is pulled out by the bottom nut during the process of the bottom nut detaching from the positioning beads.

[0022] It is further preferred that: at least one nut placement piece is provided.

[0023] Through the above technical solution, different nuts are placed in different nut placement pieces to achieve the storage of nuts, and one type of nut corresponds to one nut placement piece.

[0024] It is further preferred that: the first driving member includes a first lifting cylinder and a nut switching cylinder;

[0025] A connecting seat is fixed at the bottom of the main body connecting plate, a fixed seat is fixed at the bottom of the connecting seat, the first lifting cylinder is embedded in the fixed seat and cooperates with it in horizontal sliding, the fixed block is fixed on the first lifting cylinder, the first lifting cylinder is used to drive the fixed block to move up and down, and the nut switching cylinder is fixed on the fixed seat and is used to push the fixed block and the first lifting cylinder to move horizontally.

[0026] Through the above technical solution, the nut switching cylinder realizes the switching between multiple nut placement pieces, so that different nuts can be automatically switched during projection welding, which is convenient for the nut grabbing mechanism to grab different types of nuts. The first lifting cylinder realizes the change of the upper and lower positions of the nut placement piece, which is convenient for the nut grabbing mechanism to grab the nut.

[0027] It is further preferred that: the clamping jaw member further comprises an in-position detection device and a clamping jaw body, and the clamping jaw body is fixed on the second driving member;

[0028] The in-place detection device includes a detection piece, a first in-place sensor and a second in-place sensor, wherein the first in-place sensor and the second in-place sensor are respectively fixed on both sides of the clamp body, the static arm is fixed on the clamp body and is located on the same side of the clamp body as the second in-place sensor, the detection piece is fixed to the movable arm and moves toward or away from the static arm under the drive of the spacing adjustment member, and the detection piece, the first in-place sensor and the movable arm are located on the same side of the clamp body.

[0029] Through the above technical solution, the detection piece moves with the movable arm toward or away from the static arm, so as to facilitate the detection of whether the clamping claw is fully opened or closed.

[0030] It is further preferred that: the spacing adjustment member includes an adjustment cylinder and a guide rod, the adjustment cylinder is fixed on the clamp body, both ends of the guide rod pass through the movable arm and the static arm respectively, and the adjustment cylinder is used to drive the movable arm to move along the length direction of the guide rod.

[0031] Through the above technical solution, it is easy to adjust the distance between the movable arm and the static arm, that is, the gripping width of the clamping claws.

[0032] It is further preferred that: the lower ends of the movable arm and the static arm are both provided with notches for grabbing the nut on one side close to each other.

[0033] The above technical solution makes it easy to clamp the nut and prevent the nut from falling off.

[0034] It is further preferred that: the second driving member includes a second lifting cylinder and a rotating cylinder;

[0035] The second lifting cylinder is fixed on the fixed seat, an end plate is fixed on the end of the piston rod of the second lifting cylinder, a support plate is fixed on the bottom of the end plate, the rotating cylinder is fixed on the support plate, a support seat is connected to the rotating cylinder, the support seat is fixed to the clamp body, and the rotating cylinder is used to drive the support seat and the clamp body to rotate.

[0036] Through the above technical solution, the rotating cylinder realizes the position transformation of the nut grasping mechanism from the clamping position of the nut placing piece to the position above the locating pin, and the second lifting cylinder realizes the position transformation of the nut grasping mechanism from the position above the locating pin to the position at the locating pin.

[0037] Further preferably, the second driving member further comprises a cantilever, one end of the cantilever is rotatably connected to the support plate, and the other end of the cantilever is connected to the support seat.

[0038] Through the above technical solution, the connectivity between the nut grabbing mechanism and the second driving member is improved, and the connection strength is enhanced.

[0039] In summary, the present invention has the following beneficial effects:

[0040] 1. Cost saving.

[0041] When traditional projection welding technology is to realize automated production, one projection welded nut needs to be equipped with a nut conveyor. The input of the nut conveyor increases with the type of parts to be projection welded, and the equipment investment is large. In the technical solution of the present invention, multiple projection welded nuts can be conveyed by the same conveying mechanism, which greatly reduces the investment in nut conveying equipment.

[0042] 2. Reduced the production area and eliminated the semi-finished product inventory area.

[0043] As the number of projection welding machines and nut conveyors is reduced, the floor space of the production line is reduced; by integrating projection welding with spot welding, there is no need to build semi-finished product inventory in advance, and the single-piece flow production of parts is realized, eliminating the projection welding semi-finished product inventory and reducing the inventory area of ​​semi-finished products.

[0044] 3. The nut conveying mechanism is shared and the utilization rate of the nut conveying mechanism is improved.

[0045] In the production process of traditional projection welding technology, due to the limited space around the projection welding machine, after installing multiple nut conveying rods, the parts will interfere with the conveying mechanism during projection welding and cannot reach the required position for projection welding. One nut conveyor can only correspond to one type of projection welding nut, and the utilization rate of the projection welding machine is low; in the scheme of the present invention, the automatic switching of the nut conveying mechanism is utilized to realize the conveyance of multiple projection welding nuts on the same conveying mechanism, thereby improving the utilization rate of the projection welding machine and the nut conveyor during automatic projection welding. Because the conveying mechanism is more compact and occupies less space than the traditional nut conveyor, it can cope with more complex projection welding postures. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural schematic diagram of an embodiment, which is mainly used to embody the overall structure of the nut conveying mechanism;

[0047] Figure 2 It is a structural schematic diagram of an embodiment, which is mainly used to illustrate the structure of the nut grabbing mechanism when grabbing a nut;

[0048] Figure 3 It is a structural schematic diagram of an embodiment, which is mainly used to reflect the structure of the nut storage mechanism;

[0049] Figure 4 It is a partial structural schematic diagram of the embodiment, which is mainly used to reflect the positional relationship between the positioning bead, the nut and the inner tube;

[0050] Figure 5 It is a structural schematic diagram of an embodiment, which is mainly used to reflect the structure of the nut grabbing mechanism;

[0051] Figure 6 It is a schematic structural diagram of an embodiment, and is mainly used to illustrate the structure of the clamping jaw member.

[0052] In the figure, 1, main body connecting plate; 2, connecting seat; 3, nut storage mechanism; 31, nut placement member; 311, outer tube; 312, fixing block; 313, connecting block; 314, positioning bead; 315, inner tube; 316, limiting sleeve; 32, first driving member; 321, first lifting cylinder; 322, nut switching cylinder; 323, fixing plate; 4, nut grabbing mechanism; 41, clamping claw member; 411, movable arm; 412, stationary arm; 4131, detection sheet; 4132, first in-position sensor; 4133, second in-position sensor; 414, jaw body; 415, spacing adjustment member; 4151, adjustment cylinder; 4152, guide rod; 416, notch; 42, second driving member; 421, second lifting cylinder; 422, end plate; 423, rotating cylinder; 424, support plate; 425, support seat; 426, cantilever; 5, fixed seat; 51, top plate; 52, support column; 53, side plate; 6, nut. DETAILED DESCRIPTION

[0053] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0054] Embodiment: A clamping claw type nut conveying mechanism, such as Figure 1 , 2 , 3, 4, 5, 6, including a main body connecting plate 1, a nut storage mechanism 3 and a nut grabbing mechanism 4. The main body connecting plate 1 is used to fix the nut conveying mechanism on the projection welding machine as a whole by bolts. A connecting seat 2 is fixed at the bottom of the main body connecting plate 1, and a fixing seat 5 is fixed at the bottom of the connecting seat 2. The fixing seat 5 includes a top plate 51, a support column 52 and a side plate 53. The top plate 51 is bolted to the connecting seat 2, the upper part of the support column 52 is fixed on the top plate 51, and the side plate 53 is fixed to the side of the connecting seat 2.

[0055] Reference Figure 1 , 2 , 3, 4, 5, 6, the nut storage mechanism 3 includes a nut placement member 31 for storing nuts 6 and a first driving member 32 for driving the nut placement member 31 to move up and down and horizontally. The nut placement member 31 includes an outer tube 311, a fixing block 312, a connecting block 313, a positioning bead 314, a limiting sleeve 316 and an inner tube 315. The inner tube 315 is vertically arranged and accommodated in the outer tube 311, the nut 6 is sleeved on the surface of the inner tube 315 and is located between the inner tube 315 and the outer tube 311, and a plurality of nuts 6 are strung up and down on the inner tube 315. The upper end of the inner tube 315 is inserted and fastened in the limiting sleeve 316, and the limiting sleeve 316 is located at the upper end of the outer tube 311 and is covered at the upper end of the outer tube 311. The upper part of the outer tube 311 is fixed on the fixing block 312, the connecting block 313 is located below the outer tube 311 and fixed to the outside of the outer tube 311, the positioning bead 314 is located directly below the inner tube 315 and installed on the connecting block 313, and the positioning bead 314 steel ball is accommodated in the through hole on the bottom surface of the nut 6. A spacing is provided between the lower port of the outer tube 311 and the top surface of the connecting block 313 for the nut 6 to be exposed outward and detached from the positioning bead 314 steel ball from the side, and the spacing is greater than the thickness of the nut 6 and less than twice the thickness of the nut 6. Preferably, the spacing is less than two-thirds of the thickness of the nut 6. The lower end surface of the outer tube 311 and the lower end surface of the inner tube 315 are in the same horizontal plane. According to the type of nut 6, at least one nut placement member 31 is provided, and a plurality of nut placement members 31 are arranged side by side along the direction of horizontal movement of the nut placement member 31.

[0056] Reference Figure 1 , 2, 3, 4, 5, 6, the first driving member 32 includes a first lifting cylinder 321, a nut switching cylinder 322 and a fixing plate 323. The first lifting cylinder 321 is embedded in the support column 52 of the fixing seat 5 and is horizontally slidably matched therewith. The fixing plate 323 is fixed to the bottom surface of the first lifting cylinder 321, and the outer tube 311 passes through the fixing plate 323 up and down. The fixing block 312 is fixed on the piston rod of the first lifting cylinder 321, and the first lifting cylinder 321 is used to drive the fixing block 312 to move up and down. The nut switching cylinder 322 is fixed on the support column 52 and the top plate 51 of the fixing seat 5 and is used to push the fixing block 312 and the first lifting cylinder 321 to move horizontally as a whole.

[0057] Reference Figure 1 , 2 , 3, 4, 5, 6, the nut grabbing mechanism 4 includes a clamping jaw 41 for grabbing the nut 6 and a second driving member 42 for driving the clamping jaw 41 to move up and down and rotate horizontally. The clamping jaw 41 includes an in-place detection device, a clamping jaw body 414, a movable arm 411, a stationary arm 412, and a spacing adjustment member 415 for adjusting the spacing between the movable arm 411 and the stationary arm 412. The movable arm 411 and the stationary arm 412 cooperate to grab the nut 6. The clamping jaw body 414 is fixed on the second driving member 42, and the in-place detection device includes a detection sheet 4131, a first in-place sensor 4132 and a second in-place sensor 4133. The first in-place sensor 4132 and the second in-place sensor 4133 are respectively fixed on both sides of the clamping jaw body 414. The stationary arm 412 is fixed on the clamp body 414 and is located on the same side of the clamp body 414 as the second in-place sensor 4133. The detection piece 4131 is fixed to the movable arm 411 and moves towards or away from the stationary arm 412 respectively under the drive of the spacing adjustment member 415. The detection piece 4131, the first in-place sensor 4132 and the movable arm 411 are located on the same side of the clamp body 414. The first in-place sensor 4132 and the second in-place sensor 4133 are both displacement sensors, and the specific types are not limited here. The first in-place sensor 413 and the second in-place sensor 4133 determine whether the clamp is opened or closed by detecting the displacement of the detection piece 4131. The detection process is a prior art and will not be repeated here. The spacing adjustment member 415 includes an adjustment cylinder 4151 and a guide rod 4152. The adjustment cylinder 4151 is fixed on the clamp body 414. The two ends of the guide rod 4152 pass through the movable arm 411 and the static arm 412 respectively. The adjustment cylinder 4151 is used to drive the movable arm 411 to move along the length direction of the guide rod 4152. The movable arm 411 is fixed on the piston rod of the adjustment cylinder 4151. The upper ends of the movable arm 411 and the static arm 412 are both sleeved on the guide rod 4152, and the lower ends are both grasping parts and are provided with a notch 416 for grasping the nut 6 on the side close to each other.

[0058] Reference Figure 1 , 2, 3, 4, 5, 6, the second driving member 42 includes a second lifting cylinder 421, a rotating cylinder 423 and a cantilever 426. The second lifting cylinder 421 is fixed on the fixed seat 5, and the lower end of the piston rod of the second lifting cylinder 421 is fixed with an end plate 422, and the bottom of the end plate 422 is fixed with a support plate 424, and the rotating cylinder 423 is fixed on the support plate 424. The rotating cylinder 423 is connected with a support seat 425, and the support seat 425 is fixed to the clamp body 414. The rotating cylinder 423 is used to drive the support seat 425 and the clamp body 414 to rotate 360 ​​degrees. When the movable arm 411 and the static arm 412 rotate to the nut placement member 31, the inner tube 315 is located directly above the notch 416 of the movable arm 411 and the static arm 412. One end of the cantilever 426 is rotatably connected to the support plate 424, and the other end is connected to the support seat 425. The second driving member 42 and the first driving member 32 are respectively located at two opposite sides of the fixing base 5 .

[0059] Nut 6 grabbing process:

[0060] 1. Drive the first lifting cylinder 321 to lower the nut placement member 31 filled with nuts 6 from the origin to the working position;

[0061] Second, drive the regulating cylinder 4151 to move the movable arm 411 toward the stationary arm 412 and clamp the nut 6. At this time, the clamped nut 6 is the nut 6 strung at the bottom of the inner tube 315.

[0062] 3. Drive the rotating cylinder 423 to disengage the clamped nut 6 from the positioning ball 314 and move it from the lower end of the inner tube 315 to the top of the projection welding positioning pin;

[0063] 4. Drive the first lifting cylinder 321 to return the nut placing member 31 to the origin;

[0064] Fifth, drive the second lifting cylinder 421 to lower the clamped nut 6 from above the projection welding positioning pin to the positioning pin. At this time, the projection welding positioning pin is located in the middle of the hole of the nut 6;

[0065] 6. Drive the regulating cylinder 4151 to move the movable arm 411 away from the stationary arm 412 and loosen the nut 6. At this time, the nut 6 falls on the projection welding positioning pin.

[0066] 7. Drive the second lifting cylinder 421 to return the nut grabbing mechanism 4 to above the projection welding positioning pin;

[0067] 8. Drive the rotary cylinder 423 to rotate the nut grabbing mechanism 4 to the origin. At this time, the nut grabbing mechanism 4 is located below the nut placing member 31 .

[0068] When the nut 6 needs to be switched, the nut switching cylinder 322 works to move the nut placement member 31 of the specified type of nut 6 to the top of the grabbing portion of the movable arm 411 and the stationary arm 412. The distance between the movable arm 411 and the stationary arm 412 is detected by the in-place detection device to determine whether the switch is in place or closed. The in-place detection is a prior art and will not be described in detail here.

[0069] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A jaw-type nut conveying mechanism, characterized in that: It comprises a body connecting plate (1), a nut storage mechanism (3) and a nut grabbing mechanism (4), wherein the body connecting plate (1) is used to fix the nut conveying mechanism on a projection welding machine; The nut storage mechanism (3) comprises a nut placement member (31) for storing nuts (6) and a first driving member (32) for driving the nut placement member (31) to move up and down and horizontally; The nut grabbing mechanism (4) comprises a clamping claw member (41) for grabbing the nut (6) and a second driving member (42) for driving the clamping claw member (41) to move up and down and rotate horizontally; The clamping claw member (41) comprises a movable arm (411), a stationary arm (412) and a spacing adjustment member (415) for adjusting the spacing between the movable arm (411) and the stationary arm (412); the movable arm (411) and the stationary arm (412) cooperate to grasp the nut (6); and the nut placement member (31) comprises an outer tube (311), a fixing block (312), a connecting block (313), a positioning bead (314) and an inner tube (315); The inner tube (315) is vertically arranged and contained in the outer tube (311); the nut (6) is sleeved on the surface of the inner tube (315) and is located between the inner tube (315) and the outer tube (311); the upper part of the outer tube (311) is fixed on the fixing block (312); the connecting block (313) is located below the outer tube (311) and is fixed to the outer side of the outer tube (311); the positioning bead (314) is located directly below the inner tube (315) and is installed on the connecting block (313); The positioning bead (314) steel ball is accommodated in the through hole on the bottom surface of the nut (6); a spacing is provided between the lower end of the outer tube (311) and the top surface of the connecting block (313) for the nut (6) to be exposed outwards and detached from the positioning bead (314) steel ball from the side; the spacing is greater than the thickness of the nut (6) and less than twice the thickness of the nut (6); at least one nut placement member (31) is provided; and the first driving member (32) comprises a first lifting cylinder (321) and a nut switching cylinder (322); A connecting seat (2) is fixed at the bottom of the main connecting plate (1), a fixing seat (5) is fixed at the bottom of the connecting seat (2), the first lifting cylinder (321) is embedded in the fixing seat (5) and horizontally slides with it, the fixing block (312) is fixed on the first lifting cylinder (321), the first lifting cylinder (321) is used to drive the fixing block (312) to move up and down, and the nut switching cylinder (322) is fixed on the fixing seat (5) and is used to push the fixing block (312) and the first lifting cylinder (321) to move horizontally.

2. A clamping claw type nut conveying mechanism according to claim 1, characterized in that: The clamping jaw member (41) further comprises an in-position detection device and a clamping jaw body (414), and the clamping jaw body (414) is fixed on the second driving member (42); The in-position detection device comprises a detection piece (4131), a first in-position sensor (4132) and a second in-position sensor (4133); the first in-position sensor (4132) and the second in-position sensor (4133) are respectively fixed on both sides of the clamp body (414); the stationary arm (412) is fixed on the clamp body (414) and is located on the same side of the clamp body (414) as the second in-position sensor (4133); the detection piece (4131) is fixed to the movable arm (411) and moves towards or away from the stationary arm (412) under the drive of the spacing adjustment member (415); the detection piece (4131), the first in-position sensor (4132) and the movable arm (411) are located on the same side of the clamp body (414).

3. A clamping claw type nut conveying mechanism according to claim 2, characterized in that: The spacing adjustment member (415) comprises an adjustment cylinder (4151) and a guide rod (4152); the adjustment cylinder (4151) is fixed on the clamp body (414); two ends of the guide rod (4152) respectively pass through the movable arm (411) and the stationary arm (412); the adjustment cylinder (4151) is used to drive the movable arm (411) to move along the length direction of the guide rod (4152).

4. A clamping claw type nut conveying mechanism according to claim 2, characterized in that: The lower ends of the movable arm (411) and the stationary arm (412) are both provided with a notch (416) for grabbing the nut (6) on one side close to each other.

5. The clamping claw type nut conveying mechanism according to claim 2, characterized in that: The second driving member (42) comprises a second lifting cylinder (421) and a rotating cylinder (423); The second lifting cylinder (421) is fixed on the fixed seat (5); an end plate (422) is fixed on the end of the piston rod of the second lifting cylinder (421); a support plate (424) is fixed on the bottom of the end plate (422); the rotating cylinder (423) is fixed on the support plate (424); a support seat (425) is connected to the rotating cylinder (423); the support seat (425) is fixed to the clamp body (414); and the rotating cylinder (423) is used to drive the support seat (425) and the clamp body (414) to rotate.

6. A clamping claw type nut conveying mechanism according to claim 5, characterized in that: The second driving member (42) further comprises a cantilever (426), one end of the cantilever (426) being rotatably connected to the support plate (424), and the other end of the cantilever (426) being connected to the support seat (425).

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