Two-shaft crank connecting rod positioning mechanism

Abstract

The utility model discloses a two-shaft crank connecting rod positioning mechanism which aims at solving the problem that a sensor of an existing crank connecting rod mechanism is fixed through a screw, a preset point of a sliding block is inconvenient to adjust when needing to be changed, and therefore positioning is very inconvenient. The mechanism comprises a rack, a rotation driving piece installed on the rack, two sliding blocks connected to the rack in a sliding mode, a positioning sensor and a controller, the left side and the right side of the rack are rotationally connected with two rotating shafts through bearings, the two rotating shafts are in transmission connection, and the output end of the rotation driving piece is fixedly connected with one rotating shaft. The left-right adjusting assembly drives the two movable blocks and the positioning sensor to get close to each other or get away from each other, so that when preset points of the clamping jaw and the sliding block need to be changed, positioning adjustment is very convenient so as to be suitable for grabbing operation of different products, the products are prevented from being damaged by too large clamping force, and the working efficiency is improved. Or the clamping force is too small, so that the product falls off from the clamping jaw.

Description

Technical Field

[0001] This utility model belongs to the field of crank connecting rod technology, specifically relating to a two-axis crank connecting rod positioning mechanism. Background Technology

[0002] Mechanical transmission systems are a common type of mechanical structure, widely used in engineering machinery, automated equipment, and robotics. Traditional transmission methods include gear drives, chain drives, and belt drives, each with its own advantages and disadvantages. However, in some specific applications, they may suffer from low efficiency, large space occupation, and poor flexibility. The crank-connecting rod mechanism, due to its simple structure and excellent motion conversion capability, has become an important component of mechanical design. This mechanism can convert rotary motion into linear motion and is commonly found in various types of mechanical equipment.

[0003] In existing crank-connecting rod mechanisms, the slider typically reciprocates around a preset point under the action of a drive component. During the slider's movement, the preset point of the slider's reciprocating motion is usually used as the slider's positioning point. When the slider reaches the positioning point, the sensor's state changes, thus determining that the slider is at the positioning point. However, in actual use, the sensor position is fixed by screws, and it is inconvenient to adjust the preset point of the slider when it needs to change, making positioning very inconvenient. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a two-axis crank-connecting rod positioning mechanism. This mechanism aims to solve the problem that the sensor position of the existing crank-connecting rod mechanism is fixed by screws, and it is inconvenient to adjust when the preset point of the slider needs to change, resulting in very inconvenient positioning.

[0006] (2) Technical solution

[0007] To solve the above-mentioned technical problems, this utility model provides a two-axis crank-connecting rod positioning mechanism. The mechanism includes a frame, a rotary drive component mounted on the frame, two sliders slidably connected to the frame, a positioning sensor, and a controller. Two rotating shafts are rotatably connected to the left and right sides of the frame via bearings. The two rotating shafts are connected by a transmission connection. The output end of the rotary drive component is fixedly connected to one of the rotating shafts. The other end of the rotating shaft is fixedly connected to a main crank. The main crank is movably connected to the sliders via a main connecting rod. Two grippers are fixedly connected to the lower surfaces of the two sliders. The positioning sensor is mounted on the frame via a left-right adjustment assembly. A sensing plate corresponding to the positioning sensor is fixedly connected to the upper surface of the slider.

[0008] Preferably, the frame includes a horizontal plate, and two L-shaped side plates are fixedly connected to the left and right sides of the horizontal plate, with mounting holes provided on the L-shaped side plates.

[0009] Furthermore, the left and right adjustment assembly includes a lead screw rotatably connected between the two L-shaped side plates and a slide rod fixedly connected between the two L-shaped side plates. Two movable blocks are sleeved on the outer surfaces of the lead screw and the slide rod, and both movable blocks are slidably connected to the slide rod. Left-hand threads and right-hand threads are respectively opened on the left and right sides of the outer surface of the lead screw. Both movable blocks are threadedly connected to the lead screw. The positioning sensor is a proximity switch. There are two positioning sensors installed on the front of the movable blocks. A handle is fixedly connected to the left side of the lead screw.

[0010] Furthermore, the rotary drive component is a stepper motor or a servo motor, and the rotary drive component is fixedly connected to the upper surface of the horizontal plate.

[0011] Furthermore, the rotating shafts are rotatably connected to the horizontal plate via bearings, and the outer surfaces of both rotating shafts are fixedly connected with first gears. The two first gears are meshed and have the same size.

[0012] Furthermore, the lower surface of the main crank is rotatably connected to the main connecting rod via a first pin, and the other end of the main connecting rod is rotatably connected to the slider via a second pin.

[0013] Furthermore, two guide rods are fixedly connected between the two L-shaped side plates, and linear sliding bearings are installed on both the front and rear sides of the slider. The slider is sleeved on the outer surface of the two guide rods through the linear sliding bearings.

[0014] Furthermore, the crank is located between the front and rear guide rods, and the diameter of the main crank is smaller than that of the first gear.

[0015] Furthermore, threaded holes are provided on both the front and rear sides of the lower surface of the slider, and screws are provided on both the front and rear sides of the gripper, with the screws threaded into the threaded holes.

[0016] Furthermore, a cover plate is fixedly connected to the lower surface of the two L-shaped side plates, and the cover plate has through holes corresponding to the grippers.

[0017] Beneficial effects

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention uses a rotary drive and gear transmission to drive two rotating shafts and two main cranks to rotate in opposite directions. During the rotation, the main cranks can drive the slider and gripper to move closer or further apart along the guide rod via the main connecting rod. When the positioning sensor detects the position of the sensing plate, the controller controls the rotary drive to shut off, thus simplifying the transmission structure and making the positioning more accurate.

[0020] This invention uses a left-right adjustment component to move two movable blocks and a positioning sensor closer or further apart, making positioning adjustment very convenient when the preset points of the gripper and slider need to be changed. This is suitable for gripping different products and prevents excessive clamping force from damaging the product or insufficient clamping force from causing the product to fall off the gripper. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below.

[0023] Figure 3 This is the utility model Figure 2 A magnified structural diagram of point A in the middle.

[0024] Figure 4 This is a front view structural diagram of this utility model.

[0025] Figure 5 This is a bottom view of the structure of this utility model.

[0026] Figure 6 This is a schematic diagram of the connection structure of the two connecting rods of this utility model.

[0027] Figure 7 This is a schematic diagram of the installation structure of the gripper of this utility model.

[0028] Figure 8 This is a schematic diagram of the cover plate of this utility model.

[0029] The labels in the attached diagram are as follows: 1. Frame; 2. Rotary drive component; 3. Slider; 4. Positioning sensor; 5. Rotary shaft; 6. Main crank; 7. Main connecting rod; 8. Gripper; 9. Left and right adjustment assembly; 10. Sensor plate; 11. Guide rod; 12. Linear sliding bearing; 13. First pin; 14. Second pin; 15. Threaded hole; 16. Screw; 17. Cover plate; 18. Through hole; 101. Horizontal plate; 102. L-shaped side plate; 103. Mounting hole; 501. First gear; 901. Lead screw; 902. Slide rod; 903. Movable block; 904. Handle. Detailed Implementation

[0030] This specific embodiment is a two-axis crank-connecting rod positioning mechanism, and its structural schematic diagram is shown below. Figures 1-8As shown, the mechanism includes a frame 1, a rotary drive 2 mounted on the frame 1, two sliders 3 slidably connected to the frame 1, a positioning sensor 4, and a controller. Two rotating shafts 5 are rotatably connected to the left and right sides of the frame 1 via bearings. The two rotating shafts 5 are connected by a transmission. The output end of the rotary drive 2 is fixedly connected to one of the rotating shafts 5. The other end of the rotating shaft 5 is fixedly connected to a main crank 6. The main crank 6 is movably connected to the slider 3 via a main connecting rod 7. Two grippers 8 are fixedly connected to the lower surface of each slider 3. The rotary drive 2 causes the two rotating shafts 5 to rotate in opposite directions and causes the two grippers 8 to move closer or further apart. The positioning sensor 4 is mounted on the frame 1 via a left and right adjustment assembly 9. A sensing plate 10 corresponding to the positioning sensor 4 is fixedly connected to the upper surface of the slider 3. The positioning sensor 4 is used to detect the position of the sensing plate 10. The controller is used to control the opening or closing of the rotary drive 2 based on the signal from the positioning sensor 4.

[0031] like Figure 1 and Figure 2 As shown: In this embodiment, the frame 1 includes a horizontal plate 101, and two L-shaped side plates 102 are fixedly connected to the left and right sides of the horizontal plate 101. The L-shaped side plates 102 are provided with mounting holes 103.

[0032] The device can be fixed in a suitable position through the mounting holes 103 on the two L-shaped side plates 102, making it more convenient to use.

[0033] like Figure 2 and Figure 3 As shown: In this embodiment, the left and right adjustment component 9 includes a lead screw 901 rotatably connected between two L-shaped side plates 102 and a slide rod 902 fixedly connected between the two L-shaped side plates 102. Two movable blocks 903 are sleeved on the outer surfaces of the lead screw 901 and the slide rod 902. Both movable blocks 903 are slidably connected to the slide rod 902. Left-handed threads and right-handed threads are respectively opened on the left and right sides of the outer surface of the lead screw 901. Both movable blocks 903 are threadedly connected to the lead screw 901. The positioning sensor 4 is a proximity switch. There are two positioning sensors 4, which are installed on the front of the movable blocks 903. A handle 904 is fixedly connected to the left side of the lead screw 901.

[0034] During the rotation of the lead screw 901, the two movable blocks 903 and the positioning sensor 4 can move closer or further apart, making it very convenient to adjust the positioning when the preset points of the gripper 8 and the slider 3 need to be changed.

[0035] In this embodiment, the rotary drive 2 is a stepper motor or a servo motor. The rotary drive 2 is fixedly connected to the upper surface of the horizontal plate 101. The stepper motor or servo motor effectively ensures that the two grippers 8 move synchronously towards or away from each other, making the gripping of items more accurate and stable.

[0036] like Figure 5 and Figure 6 As shown: In this embodiment, the rotating shaft 5 is rotatably connected to the horizontal plate 101 via bearings. The outer surfaces of the two rotating shafts 5 are fixedly connected with first gears 501. The two first gears 501 are meshed and have the same size. In this way, the two main cranks 6 rotate at the same angle during the meshing transmission of the two first gears 501, which better enables the gripper 8 to move. The lower surface of the main crank 6 is rotatably connected to the main connecting rod 7 via the first pin 13. The other end of the main connecting rod 7 is rotatably connected to the slider 3 via the second pin 14. In this way, during the rotation of the main crank 6, the slider 3 and the gripper 8 can be driven to move closer or further apart along the guide rod 11 via the main connecting rod 7.

[0037] like Figure 5 and Figure 7 As shown: In this embodiment, two guide rods 11 are fixedly connected between the two L-shaped side plates 102. Linear sliding bearings 12 are installed on both the front and rear sides of the slider 3. The slider 3 is sleeved on the outer surface of the two guide rods 11 through the linear sliding bearings 12.

[0038] By fixing a linear sliding bearing 12 in the inner hole of the slider 3, each slider 3 is sleeved on the outer surface of the guide rod 11 through the linear sliding bearing 12 in its inner hole, so as to reduce the friction between the slider 3 and the guide rod 11, making the slider 3 slide more smoothly, reducing wear, and improving the service life of the parts.

[0039] like Figure 6 As shown: In this embodiment, the main crank 6 is located between the front and rear guide rods 11. The diameter of the main crank 6 is smaller than that of the first gear 501, so that the two main cranks 6 will not contact each other during the meshing transmission of the two first gears 501.

[0040] like Figure 1 and Figure 7 As shown: In this embodiment, threaded holes 15 are provided on both the front and rear sides of the lower surface of the slider 3, and screws 16 are provided on both the front and rear sides of the gripper 8. The screws 16 are threaded into the threaded holes 15, which makes it convenient to replace or repair the gripper 8.

[0041] like Figure 2 and Figure 8 As shown: In this embodiment, a cover plate 17 is fixedly connected to the lower surface of the two L-shaped side plates 102. The cover plate 17 has through holes 18 corresponding to the grippers 8, which makes the frame 1 more robust.

[0042] Working principle: When in use, the rotary drive 2 drives the rotary shaft 5 to rotate. Since the outer surfaces of the two rotary shafts 5 are fixedly connected with the first gear 501, and the two first gears 501 are meshed and of the same size, the two rotary shafts 5 drive the two main cranks 6 to rotate in opposite directions. During the rotation of the main cranks 6, the main cranks 6 can drive the slider 3 and the gripper 8 to move closer or further away from each other along the guide rod 11 through the main connecting rod 7. When the positioning sensor 4 detects the position of the detection sensor 10, the controller controls the rotary drive 2 to shut off, thus simplifying the transmission structure and making the positioning more accurate. Furthermore, the screw 901 is driven to rotate by turning the handle 904. Since the left and right sides of the outer surface of the screw 901 are respectively provided with left-hand and right-hand threads, and the two movable blocks 903 are threadedly connected to the screw 901, the screw 901 can drive the two movable blocks 903 and the positioning sensor 4 to move closer or further away from each other during the rotation of the screw. Thus, when the preset points of the gripper 8 and the slider 3 need to be changed, the positioning adjustment is very convenient.

[0043] All technical features in this embodiment can be freely combined according to actual needs.

[0044] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A two-axis crank-connecting rod positioning mechanism, comprising a frame (1), a rotary drive component (2) mounted on the frame (1), two sliders (3) slidably connected to the frame (1), a positioning sensor (4), and a controller, characterized in that: The left and right sides of the frame (1) are rotatably connected by bearings to two rotating shafts (5). The two rotating shafts (5) are connected by transmission. The output end of the rotating drive (2) is fixedly connected to one of the rotating shafts (5). The other end of the rotating shaft (5) is fixedly connected to a main crank (6). The main crank (6) is movably connected to the slider (3) through a main connecting rod (7). The lower surfaces of the two sliders (3) are fixedly connected to two grippers (8). The positioning sensor (4) is mounted on the frame (1) through a left and right adjustment assembly (9). The upper surface of the slider (3) is fixedly connected to a sensing plate (10) corresponding to the positioning sensor (4).

2. The two-shaft crank-connecting rod positioning mechanism according to claim 1, characterized in that, The frame (1) includes a horizontal plate (101), and two L-shaped side plates (102) are fixedly connected to the left and right sides of the horizontal plate (101). The L-shaped side plates (102) are provided with mounting holes (103).

3. The two-shaft crank-connecting rod positioning mechanism according to claim 2, characterized in that, The left and right adjustment assembly (9) includes a lead screw (901) rotatably connected between two L-shaped side plates (102) and a slide rod (902) fixedly connected between the two L-shaped side plates (102). Two movable blocks (903) are sleeved on the outer surfaces of the lead screw (901) and the slide rod (902). Both movable blocks (903) are slidably connected to the slide rod (902). Left-handed threads and right-handed threads are respectively opened on the left and right sides of the outer surface of the lead screw (901). Both movable blocks (903) are threadedly connected to the lead screw (901). The positioning sensor (4) is a proximity switch. There are two positioning sensors (4) installed on the front of the movable blocks (903). A handle (904) is fixedly connected to the left side of the lead screw (901).

4. The two-shaft crank-connecting rod positioning mechanism according to claim 3, characterized in that, The rotary drive component (2) is a stepper motor or a servo motor, and the rotary drive component (2) is fixedly connected to the upper surface of the horizontal plate (101).

5. The two-shaft crank-connecting rod positioning mechanism according to claim 4, characterized in that, The rotating shaft (5) is rotatably connected to the horizontal plate (101) via a bearing. The outer surfaces of the two rotating shafts (5) are fixedly connected with first gears (501). The two first gears (501) are meshed and have the same size.

6. The two-shaft crank-connecting rod positioning mechanism according to claim 5, characterized in that, The lower surface of the main crank (6) is rotatably connected to the main connecting rod (7) via the first pin (13), and the other end of the main connecting rod (7) is rotatably connected to the slider (3) via the second pin (14).

7. The two-shaft crank-connecting rod positioning mechanism according to claim 6, characterized in that, Two guide rods (11) are fixedly connected between the two L-shaped side plates (102). Linear sliding bearings (12) are installed on both the front and rear sides of the slider (3). The slider (3) is sleeved on the outer surface of the two guide rods (11) through the linear sliding bearings (12).

8. The two-shaft crank-connecting rod positioning mechanism according to claim 7, characterized in that, The main crank (6) is located between the front and rear guide rods (11), and the diameter of the main crank (6) is smaller than that of the first gear (501).

9. The two-shaft crank-connecting rod positioning mechanism according to claim 8, characterized in that, The slider (3) has threaded holes (15) on both the front and rear sides of its lower surface, and screws (16) are provided on both the front and rear sides of the gripper (8). The screws (16) are threaded into the threaded holes (15).

10. The two-shaft crank-connecting rod positioning mechanism according to claim 9, characterized in that, A cover plate (17) is fixedly connected to the lower surface of the two L-shaped side plates (102), and the cover plate (17) has a through hole (18) corresponding to the gripper (8).

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