Multi-point riveting mechanism

Abstract

The present invention discloses a multi-point rotary riveting mechanism, comprising a servo press, a pressure head, and a fixing seat for fixing the product to be riveted, the pressure head is arranged at the bottom of the pressure rod of the press and can move up and down synchronously with the pressure rod relative to the fixing seat, and a rotating mechanism is connected between the pressure head and the pressure rod, the rotating mechanism drives the pressure head to rotate around its axis relative to the pressure rod, and is fixed after rotating to a specific angle, and a group of rivet pins facing the fixing seat are fixed at the bottom of the pressure head. The present invention has a simple and exquisite structure, and the pressure head can be rotated by setting a rotating mechanism, and two rivetings can be performed continuously, which optimizes the point riveting process and improves the work efficiency of point riveting.

Description

Technical Field

[0001] The invention relates to the technical field of water pump installation, and in particular to a multi-point riveting mechanism. Background Art

[0002] A water pump is a machine that transports liquids or pressurizes liquids. It transfers the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali liquids, emulsions, suspensions and liquid metals, etc. It can also transport liquids, gas mixtures and liquids containing suspended solids. The technical parameters of water pump performance include flow rate, suction head, head, shaft power, water power, efficiency, etc.; according to different working principles, it can be divided into positive displacement water pumps, vane pumps and other types. Positive displacement pumps use the change in the volume of their working chambers to transfer energy; vane pumps use the interaction between the rotating blades and water to transfer energy. There are centrifugal pumps, axial flow pumps and mixed flow pumps.

[0003] During the installation of the water pump, the protrusions on the inner wall of the water pump need to be riveted. The existing inner wall of the water pump usually needs to be riveted at 6 points. The current common practice is to use three rivet needles at a time, rivet 3 points at a time, rotate 120 degrees and rivet 3 points again. However, the traditional servo press cannot rotate, which makes the spot riveting efficiency of the traditional servo press extremely low and cannot meet the daily production needs. In addition, the top of the rivet needle is thin and easy to break during the spot riveting process, and it is impossible to know during the spot riveting process. The spot riveting effect needs to be tested separately, which further increases the steps of the spot riveting process and reduces the efficiency of the spot riveting process. Therefore, how to accurately and efficiently perform the spot riveting process is an urgent problem to be solved in the current water pump installation process. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a multi-point riveting mechanism.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A multi-point rotary riveting mechanism comprises a servo press, a pressing head and a fixing seat for fixing the product to be riveted, which are coaxially arranged from top to bottom. The pressing head is arranged at the bottom of the pressing rod of the press and can move up and down synchronously with the pressing rod relative to the fixing seat, and a rotating mechanism is connected between the pressing head and the pressing rod. The rotating mechanism drives the pressing head to rotate around its axis relative to the pressing rod and is fixed after rotating to a specific angle. A group of rivet pins facing the fixing seat are fixed at the bottom of the pressing head.

[0007] Preferably, a detection mechanism is provided between the pressure head and the fixing seat, and the detection mechanism can move laterally relative to the fixing seat.

[0008] Preferably, a driving cylinder is provided on one side of the fixing seat, the detecting mechanism is slidably provided on the driving cylinder and driven thereby, and the detecting mechanism can be coaxially opposite to the pressure head under the drive of the driving cylinder.

[0009] Preferably, the detection mechanism comprises a detection platform, on which a group of pressure sensors matching the positions of the rivet pins are arranged, and an elastic member in contact with the rivet pins is arranged on the top of the pressure sensors.

[0010] Preferably, the pressing head further comprises a central fixed shaft and an outer shell, wherein the outer shell is rotatably arranged outside the central fixed shaft, a disc is fixedly connected to the bottom of the outer shell, and the rivet pin is fixedly arranged at the bottom of the disc.

[0011] Preferably, the bottom of the pressure rod and the top of the central fixed shaft are respectively fixed to a fixed plate, the fixed plate is perpendicular to the pressure rod and the pressure head, the rotating mechanism is arranged on the fixed plate, the rotating mechanism includes a rolling connected gear, a rack and a first cylinder, the gear is fixed on the outer shell of the pressure head, the rack is slidably arranged on the fixed plate through a slide rail, and the first cylinder is connected to the rack and drives it to slide relative to the fixed plate.

[0012] Preferably, guide rods parallel to the pressure rod are arranged on both sides of the pressure rod, and the bottoms of the two guide rods are fixed to the fixing plate and move up and down synchronously in the guide sleeve following the fixing plate.

[0013] Preferably, an elastic column is arranged at the center of the pressing head, a spring is arranged on the elastic column, and the bottom end of the elastic column is lower than the bottom end of the rivet pin.

[0014] Preferably, a floating plate capable of floating up and down is provided on the fixing seat.

[0015] The beneficial effects of the present invention are mainly reflected in:

[0016] 1. The structure is simple and exquisite. The rotating mechanism is set to make the pressure head rotatable, and the secondary riveting is carried out continuously, which optimizes the spot riveting process and improves the work efficiency of spot riveting;

[0017] 2. Set up a detection mechanism to detect the rivet pin before each spot riveting to ensure that the rivet pin is riveted in a non-destructive state to prevent the rivet pin from breaking and causing riveting failure, thereby improving the success rate of spot riveting and reducing the scrap rate;

[0018] 3. The detection mechanism is equipped with an elastic part to transmit the pressure generated when the rivet pin contacts the pressure sensor. The elastic part can play a shock-absorbing role and can also minimize the wear of the rivet pin and reduce the impact on riveting;

[0019] 4. An elastic column is set in the center of the pressure head, so that when the pressure head is pressed down, the guide column first contacts the workpiece to be processed and plays a shock-absorbing role, avoiding damage caused by hard contact between the rivet pin and the workpiece to be processed;

[0020] 5. Set up guide rods to ensure the stability and smoothness of the pressure head and rotating mechanism during the up and down movement;

[0021] 6. The fixing seat can float up and down, which can eliminate the distance tolerance between the workpiece to be processed and the pressure head, and improve the adaptability of the fixing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0023] Figure 1 : A schematic diagram of an embodiment of the present invention;

[0024] Figure 2 : A front view of an embodiment of the present invention;

[0025] Figure 3 : A schematic diagram of a detection mechanism in an embodiment of the present invention;

[0026] Figure 4 : A schematic diagram of a rotating mechanism in an embodiment of the present invention;

[0027] Figure 5 : A schematic diagram of a rotating mechanism at another angle in an embodiment of the present invention;

[0028] Figure 6 : Partial schematic diagram of the pressure head in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0030] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0031] like Figures 1 to 6 As shown, the present invention discloses a multi-point rotary riveting mechanism, including a servo press 1, a pressure head 2, and a fixed seat 3 for fixing the product to be riveted, which are coaxially arranged from top to bottom. The pressure head 2 is arranged at the bottom of the pressure rod 101 of the press 1 and can move up and down with respect to the fixed seat 3 synchronously with it, and a rotating mechanism 4 is connected between the pressure head 2 and the pressure rod 101, and the rotating mechanism 4 drives the pressure head 2 to rotate around its axis relative to the pressure rod 101, and is fixed after rotating to a specific angle, and a group of rivet pins 201 facing the fixed seat 3 are fixed at the bottom of the pressure head 2. In this preferred embodiment, three rivet pins 201 are arranged at the bottom of the pressure head 2. Of course, the number of the rivet pins 201 is not unique, and their positions can also have other arrangements. In other embodiments, the number and position of the rivet pins 201 are set according to the specific riveting position.

[0032] like Figure 1 , Figure 2 and Figure 6 As shown, since the top of the rivet needle 201 is relatively sharp and it is easy to break and damage during the spot riveting process, a detection mechanism 5 is provided between the pressure head 2 and the fixed seat 3. In order not to hinder the pressure head 2 from pressing down and riveting, the detection mechanism 5 can move laterally relative to the fixed seat 3. Specifically, a driving cylinder 6 is provided on one side of the fixed seat 3, and the detection mechanism 5 is slidably arranged on the driving cylinder 6 and driven by it. In this preferred embodiment, the driving cylinder 6 drives the detection mechanism 5 to move forward and backward relative to the fixed seat 3. In other feasible embodiments, the driving cylinder 6 can also drive the detection mechanism 5 to move left and right. When the detection mechanism 5 moves to the end of the driving cylinder 6, the detection mechanism 5 is coaxially opposite to the pressure head 2, so that the pressure head 2 can contact the detection mechanism 5 to detect the rivet needle 201.

[0033] like Figure 3As shown, the detection mechanism 5 includes a detection platform 501, on which a group of pressure sensors 502 matching the position of the rivet pin 201 are arranged, and an elastic member 503 in contact with the rivet pin 201 is arranged on the top of the pressure sensor 502. In this preferred embodiment, the elastic member 503 generates elastic force through a spring sleeved on its outer wall. In other feasible embodiments, the elastic member 503 can be made of other elastic materials. When the tip of the rivet pin 201 contacts the elastic member 503, the elastic member 503 transmits the pressure to the pressure sensor 502. The setting of the elastic member 503 can play a shock-absorbing role to avoid the hard contact between the tip of the rivet pin 201 and the pressure sensor 503, and can also minimize the wear of the rivet pin and reduce the impact of riveting on it. A detection mechanism is set to detect the rivet pin before each spot riveting to ensure that the rivet pin is riveted in a non-destructive state, prevent the rivet pin from breaking and causing riveting failure, improve the success rate of spot riveting, and reduce the scrap rate.

[0034] like Figures 1 to 5 As shown, the pressure head 2 is connected to a rotating mechanism 4. In this preferred embodiment, the rotating mechanism 4 can drive the pressure head 2 to rotate relative to the fixed seat 3. In other feasible embodiments, the rotating mechanism 4 can be connected to the fixed seat 3 to drive the fixed seat 3 to rotate relative to the pressure head 2.

[0035] Specifically, Figures 4 to 6 As shown, the pressure head 2 further includes a central fixed shaft 203 and an outer shell 204, the outer shell 204 is rotatably arranged outside the central fixed shaft 203, a disk 205 is fixedly connected to the bottom of the outer shell 204, and the rivet pin 201 is fixedly arranged at the bottom of the disk 205. In order to facilitate the installation of the rotating mechanism 4, the bottom of the pressure rod 101 and the top of the central fixed shaft 203 are respectively fixed to a fixed plate 8, the fixed plate 8 is perpendicular to the pressure rod 101 and the pressure head 2, and the rotating mechanism 4 is arranged on the fixed plate 8.

[0036] In order to ensure the movement stability of the fixed plate 8 during the pressing process with the pressing rod 101, guide rods 7 parallel to the pressing rod 101 are arranged on both sides of the pressing rod 101, and the bottoms of the two guide rods 7 are fixedly connected to the fixed plate 8 and move up and down synchronously in the guide sleeve 701 following the fixed plate 8. In the preferred embodiment, the servo press 1 is arranged on the frame 9, and the guide sleeve 701 is fixedly arranged on the frame 9.

[0037] like Figure 4 and Figure 5As shown, the rotating mechanism 4 includes a rolling connected gear 401, a rack 402 and a first cylinder 403, the gear 401 is fixed on the outer shell 204 of the pressure head 2, the rack 402 is slidably arranged on the fixed plate 8 through a slide rail 404, and the first cylinder 403 is connected to the rack 402 and drives it to slide relative to the fixed plate 8. The working principle of the rotating mechanism 4 is as follows: in the initial state, the rack 401 is at one end of the first cylinder 403, and one end of the rack 401 is meshed with the gear 401; in the second state, the first cylinder 403 drives the rack 401 to slide relative to the fixed plate 8 along the slide rail 404, and at this time, the gear 401 is affected by the rack 402 to rotate. In this preferred embodiment, the moving distance of the rack 402 is two-thirds of the circumference of the gear 401, so that the rotating mechanism 4 can drive the pressure head 2 to rotate 120°. Of course, in other embodiments, the rotating mechanism 4 can drive the pressing head 2 to rotate to any angle and fix it, and the rotating angle of the pressing head 2 is set according to specific riveting requirements.

[0038] An elastic column 202 is arranged at the center of the pressure head 2, and a spring 2021 is arranged on the elastic column 202, and its bottom end is lower than the bottom end of the rivet pin 201. The arrangement of the elastic column 202 allows the guide column 202 to first contact the workpiece to be processed when the pressure head 2 is pressed down and play a shock absorbing role to protect the rivet pin 201, thereby preventing the rivet pin 201 from being damaged by hard contact with the workpiece. Furthermore, a shock absorbing washer (not shown in the figure) can be arranged on the contact surface between the guide column 202 and the workpiece to be processed to further reduce the wear on the workpiece to be processed.

[0039] In the present invention, in order to eliminate the machining tolerance between the workpieces to be machined, a floating plate 301 that can float up and down is provided on the fixed seat 3. Figure 1 As shown, an elastic rod that can be deformed up and down is provided at the bottom of the floating plate 301. In other feasible embodiments, the floating plate 301 can also move in three directions, up and down, left and right, and front and back, to further enhance the adaptability of the fixing seat 3.

[0040] The working process of the present invention is briefly described below:

[0041] First, the pressure rod 101 of the servo press 1 drives the pressure head 2 to press down. At this time, the detection mechanism 5 is coaxial with the pressure head 2. The pressure head 2 contacts the detection mechanism 5 under the drive of the pressure rod 101. The detection mechanism 5 detects the integrity of the rivet pin 201 through the elastic member 503 and the pressure sensor 502.

[0042] Secondly, after the detection is correct, the detection mechanism 5 is driven by the driving cylinder 6 to move away from the pressing head 2, and the pressing head 2 is driven by the pressing rod 101 to perform the first downward riveting.

[0043] Then, the pressing rod 101 drives the pressing head 2 to move upward, and at this time, the detection mechanism 5 is again driven by the driving cylinder 6 to coaxially oppose the pressing head 2 to perform another detection on the integrity of the rivet pin 201 .

[0044] Then, after the detection is correct, the detection mechanism 5 moves away from the pressure head 2, and the pressure head 2 rotates 120° under the drive of the rotation mechanism 4.

[0045] Finally, after the pressing head 2 has completed its rotation, it is driven by the pressing rod 101 to perform a second downward riveting operation.

[0046] The present invention has a simple and exquisite structure. By arranging the rotating mechanism 4, the pressing head 2 can be rotated, and two rivetings can be performed continuously, thereby optimizing the spot riveting process and improving the working efficiency of the spot riveting.

[0047] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0048] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-point rotary riveting mechanism, comprising a servo press (1), a press head (2), and a fixing seat (3) for fixing a product to be riveted, which are coaxially arranged from top to bottom, and characterized in that: The pressing head (2) is arranged at the bottom of the pressing rod (101) of the servo press (1) and can move up and down synchronously with the pressing rod (101) relative to the fixing seat (3), and a rotating mechanism (4) is connected between the pressing head (2) and the pressing rod (101), and the rotating mechanism (4) drives the pressing head (2) to rotate around its axis relative to the pressing rod (101), and is fixed after rotating to a specific angle, and a group of rivet pins (201) facing the fixing seat (3) are fixed at the bottom of the pressing head (2); by arranging the rotating mechanism (4), the pressing head (2) can be rotated, and secondary riveting can be performed continuously, and the rotation angle of the pressing head (2) is set according to specific riveting requirements; A detection mechanism (5) is provided between the pressure head (2) and the fixing seat (3), and the detection mechanism (5) can move laterally relative to the fixing seat (3); A driving cylinder (6) is provided on one side of the fixing seat (3), and the detection mechanism (5) is slidably arranged on the driving cylinder (6) and driven thereby. The detection mechanism (5) can be coaxially opposed to the pressure head (2) under the drive of the driving cylinder (6); The detection mechanism (5) comprises a detection platform (501), on which a group of pressure sensors (502) matching the positions of the rivet pins (201) are arranged, and on top of the pressure sensors (502) an elastic member (503) in contact with the rivet pins (201) is arranged.

2. The multi-point riveting mechanism according to claim 1, characterized in that: The pressing head (2) further comprises a central fixed shaft (203) and an outer shell (204); the outer shell (204) is rotatably arranged outside the central fixed shaft (203); a disc (205) is fixedly connected to the bottom of the outer shell (204); and the rivet pin (201) is fixedly arranged at the bottom of the disc (205).

3. The multi-point riveting mechanism according to claim 2, characterized in that: The bottom of the pressure rod (101) and the top of the central fixed shaft (203) are both fixedly connected to a fixed plate (8), and the fixed plate (8) is perpendicular to the pressure rod (101) and the pressure head (2). The rotating mechanism (4) is arranged on the fixed plate (8), and the rotating mechanism (4) comprises a gear (401), a rack (402) and a first cylinder (403) which are rollingly connected. The gear (401) is fixedly connected to the outer shell (204) of the pressure head (2), and the rack (402) is slidably arranged on the fixed plate (8) through a slide rail (404). The first cylinder (403) is connected to the rack (402) and drives it to slide relative to the fixed plate (8).

4. The multi-point riveting mechanism according to claim 3, characterized in that: Guide rods (7) parallel to the pressure rod (101) are arranged on both sides thereof; the bottoms of the two guide rods (7) are fixedly connected to the fixed plate (8) and follow the fixed plate (8) to move up and down synchronously in the guide sleeve (701); the servo press (1) is arranged on a frame (9), and the guide sleeve (701) is fixedly arranged on the frame (9).

5. The multi-point riveting mechanism according to claim 4, characterized in that: An elastic column (202) is arranged at the center of the pressing head (2), a spring (2021) is arranged on the elastic column (202), and the bottom end of the elastic column (202) is lower than the bottom end of the rivet pin (201).

6. The multi-point riveting mechanism according to claim 1, characterized in that: The fixing seat (3) is capable of floating up and down.

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