Automatic board edge polishing device

Abstract

The utility model discloses an automatic board edge polishing device which comprises a base, a supporting plate, a top plate, a steering mechanism, a distance adjusting mechanism and two symmetrically-arranged polishing mechanisms. The steering mechanism comprises a lifting power push rod, a lifting plate, a hollow shaft, a first driving motor and a negative pressure suction cup; the grinding mechanism comprises a guide assembly, a rotating shaft, a rotating wheel, a grinding belt, a second driving motor and a connecting plate; the distance adjusting mechanism comprises a mounting base, a double-rotation-direction screw, a nut pair, a third driving motor, a third driving gear and a third driven gear. The panel is driven to rotate through the steering mechanism, the distance adjusting mechanism drives the connecting plates of the two grinding mechanisms to move oppositely or oppositely, the panel is centered through the two grinding mechanisms, the edges of the two sides of the panel are ground at the same time, the panel does not need to be rotated manually, the labor burden of workers is relieved, and meanwhile the grinding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wood board grinding equipment, in particular to an automatic wood board edge grinding device. Background Art

[0002] In today's furniture, wooden furniture has become an indispensable and important part, so the wood boards are required to have good quality and aesthetics. During the processing, workers usually paste edge banding strips on the corners and sides of the wood boards. Before pasting the edge banding strips, the sides of the wood boards need to be polished to make the sides of the wood boards fit better with the seals.

[0003] The patent with publication number CN219684953U discloses a wooden board frame sander. By driving the sanding belt to rotate rapidly, the staff will bring the cut board close to the sanding surface of the sanding belt and sand the wood frame through the sanding surface. At the same time, the auxiliary components assist the board so that all parts of the board can be sanded evenly.

[0004] The above-mentioned grinder requires manual operation of the plate to grind the edge of the plate. After the grinding of one side of the plate is completed, the plate needs to be manually rotated to grind the remaining edges of the plate one by one. Since the plates are mostly rectangular, workers need to rotate the plate at least three times to grind the four edges of the plate. There are disadvantages of high labor intensity and low grinding efficiency, and it is impossible to achieve rapid grinding of the plate. It is necessary to make improvements. Utility Model Content

[0005] Based on this, it is necessary to provide an automatic grinding device for the edge of a wooden board to address the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an automatic wood board edge grinding device, comprising a base, a support plate fixed on the base and a top plate fixed on the support plate, and also comprising a steering mechanism, a spacing adjustment mechanism and two symmetrically arranged grinding mechanisms;

[0007] The steering mechanism includes a lifting power push rod, a lifting plate, a hollow shaft, a first drive motor, and a negative pressure suction cup. The lifting power push rod is fixedly mounted on the base, the lifting plate is fixedly mounted on the output end of the lifting power push rod, the hollow shaft is rotatably mounted on the lifting plate, the hollow shaft is connected to the negative pressure source, the first drive motor is fixedly mounted on the lifting plate, the first drive motor is transmission-connected to the hollow shaft, the negative pressure suction cup is coaxially fixedly connected to the hollow shaft, and a circular opening for the negative pressure suction cup to move is opened on the top plate;

[0008] The grinding mechanism includes a guide assembly, a rotating shaft, a rotating wheel, a grinding belt, a second driving motor and a connecting plate. The guide assembly is provided with two, and the guide assembly includes a guide rail, a first slider, a second slider, a pressure sensor, and an elastic member. The guide rail is fixedly mounted on the base, and the first slider and the second slider are slidably mounted on the guide rail. One end of the pressure sensor is connected to the second slider, and the other end is connected to the elastic member, and the other end of the elastic member is connected to the first slider; the two first sliders are rotatably mounted with a rotating shaft, and the upper ends of the two rotating shafts extend to above the top plate and are mounted on the rotating wheel. A grinding belt is installed between the two rotating wheels, and a first long strip opening for the rotating shaft to move is opened on the top plate; a mounting plate is fixed to one of the first sliders, and a second driving motor is installed on the mounting plate, and the second driving motor is transmission-connected to a rotating shaft adjacent to it; the two second sliders are fixedly connected by a connecting plate;

[0009] The spacing adjustment mechanism drives the connecting plates of the two grinding mechanisms to move toward or away from each other.

[0010] Preferably, the steering mechanism also includes a rotating joint and a negative pressure tube, the negative pressure source is fixedly mounted on the base, the lower end of the hollow shaft is connected to the negative pressure tube via the rotating joint, and the other end of the negative pressure tube is connected to the negative pressure source.

[0011] Preferably, a first driving gear is installed at the output end of the first driving motor, and a first driven gear meshingly connected with the first driving gear is installed on the hollow shaft.

[0012] Preferably, a second driving gear is installed at the output end of the second driving motor, and a second driven gear meshingly connected with the second driving gear is installed on the rotating shaft adjacent to the second driving motor.

[0013] Preferably, the spacing adjustment mechanism includes a mounting seat, a double-rotation screw, a nut pair, a third drive motor, a third driving gear, and a third driven gear. The mounting seat and the third drive motor are both fixedly mounted on the base. There are two mounting seats. A double-rotation screw is rotatably mounted between the two mounting seats. Nut pairs are threadedly mounted on two differently rotating screw sections of the double-rotation screw. The two nut pairs are respectively fixedly connected to two connecting plates. A third driven gear is fixed on the middle bare rod section of the double-rotation screw. A third driving gear meshing with the third driven gear is mounted on the output end of the third drive motor.

[0014] Preferably, the grinding mechanism also includes a stopper, a connecting rod and a cross plate. The stopper is located on the inner side of the grinding belt. The stopper and the grinding belt are arranged in cooperation. Cross plates are fixedly installed on the two first sliding blocks. Connecting rods are fixed on the cross plates. The upper ends of the connecting rods extend to above the top plate and are fixedly connected to the stopper. A second long strip opening is opened on the top plate for the connecting rod to move.

[0015] The beneficial effects of this technical solution are as follows: the plate is driven to rotate by the steering mechanism, the plate is centered by two grinding mechanisms, and both side edges of the plate are grinded simultaneously, without the need for manual rotation of the plate, thus reducing the burden of manual labor and improving grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 for Figure 1 Sectional view along line AA;

[0018] Figure 3 A top view of an embodiment of the utility model;

[0019] Figure 4 It is a side cross-sectional view of a grinding mechanism according to an embodiment of the utility model;

[0020] In the figure, 1, base; 2, support plate; 3, top plate; 31, first long strip opening; 32, second long strip opening; 4, steering mechanism; 41, lifting power push rod; 42, lifting plate; 43, hollow shaft; 44, first driving motor; 45, negative pressure suction cup; 46, rotary joint; 47, negative pressure source; 48, first driving gear; 49, first driven gear; 5, spacing adjustment mechanism; 51, mounting seat; 52, double-rotation screw; 53, screw The female pair; 54, the third driving motor; 55, the third driving gear; 56, the third driven gear; 6, the grinding mechanism; 61, the guide assembly; 611, the guide rail; 612, the first slider; 613, the second slider; 614, the pressure sensor; 615, the elastic member; 62, the rotating shaft; 63, the rotating wheel; 64, the grinding belt; 65, the second driving motor; 66, the connecting plate; 67, the second driven gear; 68, the stopper; 69, the connecting rod. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0022] See also Figures 1 to 4 , the embodiment of the present application provides an automatic wood board edge grinding device, comprising a base 1, a support plate 2 fixed on the base 1 and a top plate 3 fixed on the support plate 2, and also comprising a steering mechanism 4, a spacing adjustment mechanism 5 and two symmetrically arranged grinding mechanisms 6;

[0023] The steering mechanism 4 is used to drive the plate to rotate, so as to adjust the angle of the plate toward the grinding mechanism 6; the steering mechanism 4 includes a lifting power push rod 41, a lifting plate 42, a hollow shaft 43, a first drive motor 44, and a negative pressure suction cup 45. The lifting power push rod 41 uses a cylinder, and an electric cylinder or a hydraulic cylinder can also be used. The lifting power push rod 41 is set to two, and the two lifting power push rods 41 work synchronously. The lifting power push rod 41 is fixedly installed on the base 1, and the lifting plate 42 is fixedly installed on the output end of the lifting power push rod 41. The hollow shaft 43 is rotatably installed on the lifting plate 42. The hollow shaft 43 is connected to the negative pressure source 47. The first drive motor 44 is fixedly installed on the lifting plate 42. The first drive motor 44 is transmission-connected to the hollow shaft 43. The negative pressure suction cup 45 is coaxially fixedly connected to the hollow shaft 43, and a circular opening for the negative pressure suction cup 45 to move is opened on the top plate 3;

[0024] The grinding mechanism 6 includes a guide assembly 61, a rotating shaft 62, a rotating wheel 63, a grinding belt 64, a second driving motor 65 and a connecting plate 66. The guide assembly 61 is provided with two, and the guide assembly 61 includes a guide rail 611, a first slider 612, a second slider 613, a pressure sensor 614, and an elastic member 615. The guide rail 611 is fixedly mounted on the base 1, and the first slider 612 and the second slider 613 are slidably mounted on the guide rail 611. One end of the pressure sensor 614 is connected to the second slider 613, and the other end is connected to the elastic member 615. The other end of the elastic member 615 is connected to the first slider 612, and the second slider 613 is connected to the second slider 613. A slider 612 is connected, and the elastic member 615 is a compression spring; the two first sliders 612 are both rotatably mounted with a shaft 62 through a bearing, and the upper ends of the two shafts 62 extend above the top plate 3 and are mounted on the rotating wheel 63, and a grinding belt 64 is installed between the two rotating wheels 63, and a first long strip opening 31 for the rotating shaft 62 to move is opened on the top plate 3; a mounting plate is fixed to one of the first sliders 612, and a second driving motor 65 is installed on the mounting plate, and the second driving motor 65 is transmission-connected to an adjacent rotating shaft 62; the two second sliders 613 are fixedly connected by a connecting plate 66;

[0025] The spacing adjustment mechanism 5 drives the connecting plates 66 of the two grinding mechanisms 6 to move toward or away from each other; the spacing adjustment mechanism 5 includes a mounting seat 51, a double-rotation screw 52, ​​a nut pair 53, a third drive motor 54, a third driving gear 55, and a third driven gear 56. The mounting seat 51 and the third drive motor 54 are both fixedly mounted on the base 1. The mounting seat 51 is set to two, and a double-rotation screw 52 is rotatably mounted between the two mounting seats 51. The double-rotation screw 52 includes a polished rod section located in the middle and screw sections located on both sides of the polished rod section. The polished rod section is an optical axis without external threads. The threads of the two threaded sections rotate in opposite directions. The two screw sections of the double-rotation screw 52 that rotate differently are both threadedly mounted with a nut pair 53. The two nut pairs 53 are respectively fixedly connected to the two connecting plates 66. The third driven gear 56 is fixed to the polished rod section in the middle of the double-rotation screw 52. The output end of the third drive motor 54 is equipped with a third driving gear 55 meshing with the third driven gear 56. The third driving motor 54 drives the third driving gear 55 to rotate, and the third driving gear 55 drives the third driven gear 56 and the double-rotation screw 52 to rotate. Under the guiding and limiting action of the guide rail 611 and the second slider 613, the double-rotation screw 52 drives the two nut pairs 53 to move toward or away from each other, and then drives the two connecting plates 66 to move toward or away from each other.

[0026] The steps for grinding a rectangular plate are as follows:

[0027] S1, by placing the plate on the top plate 3 and above the round mouth, the spacing adjustment mechanism 5 drives the connecting plates 66 of the two grinding mechanisms 6 to move toward each other, and the connecting plate 66 drives the second slider 613, the pressure sensor 614, the elastic member 615, the first slider 612, the rotating shaft 62, the rotating wheel 63 and the grinding belt 64 to move linearly, so that the two grinding belts 64 move toward each other. When the pressure sensors 614 of the two grinding mechanisms 6 both detect pressure signals, it is determined that the two grinding belts 64 are in contact with the plate, and the plate is aligned by the contact between the grinding belts 64 and the plate;

[0028] S2, then the negative pressure source 47 draws air to the hollow shaft 43 and the negative pressure suction cup 45, so that negative pressure is formed on the upper end of the negative pressure suction cup 45; the negative pressure suction cup 45 is driven to rise by the lifting power push rod 41, so that the negative pressure suction cup 45 contacts the plate, and the negative pressure suction cup 45 adsorbs the plate and drives the plate to rise; so that the bottom end of the plate is higher than the upper end surface of the top plate 3 and lower than the lower end of the grinding belt 64, and at this time the grinding belt 64 can fully contact the edge of the plate;

[0029] S3, then the second driving motor 65 starts to work, driving the rotating shaft 62 and the rotating wheel 63 to rotate, thereby driving the grinding belt 64 to move, and the two grinding belts 64 grind the edges of both sides of the plate at the same time, thereby improving the grinding efficiency;

[0030] S4, after the grinding of both sides of the plate is completed, the spacing adjustment mechanism 5 drives the two grinding mechanisms 6 to move in opposite directions; then the first drive motor 44 drives the hollow shaft 43 to rotate 90 degrees, so that the other two ungrinded edges of the plate face the grinding belt 64;

[0031] S5, driving the negative pressure suction cup 45 downward by the lifting power push rod 41, so that the upper end of the negative pressure suction cup 45 is not higher than the upper end surface of the top plate 3, so that the top plate 3 bears the plate again, and the negative pressure suction cup 45 no longer negatively absorbs the plate;

[0032] S6, then repeating steps S1 to S3 to complete the grinding of the remaining two edges of the plate;

[0033] S7, after the grinding is completed, the negative pressure suction cup 45 is driven to descend by the lifting power push rod 41, so that the upper end of the negative pressure suction cup 45 is not higher than the upper end surface of the top plate 3, the top plate 3 bears the plate again, and the negative pressure suction cup 45 no longer negatively absorbs the plate;

[0034] S8, the plate on the top plate 3 can then be removed, or the two grinding belts 64 can be driven to move closer so that the grinding belts 64 contact the edge of the plate, and the grinding belts 64 are driven to move to drive the plate to move, thereby realizing the unloading of the plate.

[0035] When grinding a circular plate, the principle is roughly the same as that of grinding a rectangular plate mentioned above. The difference is that the center of the circular plate must be positioned first so that the axis of the circular plate is coaxial with the axis of the hollow shaft 43, and then the hollow shaft 43 is directly driven to rotate slowly, driving the circular plate to rotate, and the edge of the circular plate is grinded by two grinding belts 64 to improve the grinding efficiency.

[0036] In a preferred embodiment, in order to facilitate the negative pressure suction cup 45 to be connected to the negative pressure source 47, please refer to Figure 1 and Figure 2 , the steering mechanism 4 also includes a rotary joint 46 and a negative pressure pipe, the negative pressure source 47 is fixedly installed on the base 1, the lower end of the hollow shaft 43 is connected to the negative pressure pipe through the rotary joint 46, and the other end of the negative pressure pipe is connected to the negative pressure source 47; the negative pressure source 47 is an air pump or a vacuum pump. The negative pressure source 47 extracts air to the negative pressure suction cup 45 through the negative pressure pipe, the rotary joint 46, and the hollow shaft 43, so that the negative pressure suction cup 45 is connected to the negative pressure source 47. By setting the rotary joint 46, it is convenient to always keep the negative pressure suction cup 45 connected to the negative pressure source 47 when the negative pressure suction cup 45 and the hollow shaft 43 rotate.

[0037] In a preferred embodiment, in order to facilitate the first drive motor 44 to drive the hollow shaft 43 to rotate, please refer to Figure 1 and Figure 2, a first driving gear 48 is installed at the output end of the first driving motor 44, and a first driven gear 49 meshingly connected with the first driving gear 48 is installed on the hollow shaft 43. The first driving motor 44 drives the first driving gear 48, and the first driving gear 48 drives the first driven gear 49 and the hollow shaft 43 to rotate. The first driving motor 44 rotates the stepping motor to drive the hollow shaft to rotate a preset angle.

[0038] In a preferred embodiment, in order to facilitate the first drive motor 44 to drive the hollow shaft 43 to rotate, please refer to Figure 2 and Figure 4 A second driving gear is installed at the output end of the second driving motor 65, and a second driven gear 67 meshing with the second driving gear is installed on the rotating shaft 62 adjacent to the second driving motor 65. The second driving motor 65 drives the second driving gear, and the second driving gear drives the second driven gear 67 and the rotating shaft 62 to rotate.

[0039] In a preferred embodiment, in order to prevent the grinding belt 64 from being unable to uniformly contact the edge of the plate or being unable to push the plate to move linearly when in contact with the plate, please refer to Figure 1 and Figure 3 The grinding mechanism 6 also includes a stopper 68, a connecting rod 69 and a cross plate. The stopper 68 is located inside the grinding belt 64. The stopper 68 is arranged in cooperation with the grinding belt 64. The two first sliders 612 are both fixedly mounted with cross plates. The connecting rods 69 are both fixed on the cross plates. The upper ends of the connecting rods 69 extend above the top plate 3 and are fixedly connected to the stopper 68. The top plate 3 is provided with a second long strip opening 32 for the connecting rod 69 to move. By setting the stopper 68, the stopper 68 contacts and cooperates with the inner side surface of the grinding belt 64 to provide support for the grinding belt 64, so as to prevent the plate from bending the grinding belt 64, so that the working section of the grinding belt 64 can maintain a straight belt surface, which is convenient for uniform contact with the edge of the plate, and is convenient for pushing the plate to move in a straight line, and to center the plate.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An automatic wood board edge grinding device, comprising a base (1), a support plate (2) fixed to the base (1), and a top plate (3) fixed to the support plate (2), characterized in that: It also includes a steering mechanism (4), a spacing adjustment mechanism (5) and two symmetrically arranged grinding mechanisms (6); The steering mechanism (4) comprises a lifting power push rod (41), a lifting plate (42), a hollow shaft (43), a first driving motor (44), and a negative pressure suction cup (45); the lifting power push rod (41) is fixedly mounted on the base (1); the lifting plate (42) is fixedly mounted on the output end of the lifting power push rod (41); the hollow shaft (43) is rotatably mounted on the lifting plate (42); the hollow shaft (43) is connected to a negative pressure source (47); the first driving motor (44) is fixedly mounted on the lifting plate (42); the first driving motor (44) is transmission-connected to the hollow shaft (43); the negative pressure suction cup (45) is coaxially fixedly connected to the hollow shaft (43); and a circular opening is provided on the top plate (3) for the negative pressure suction cup (45) to move. The grinding mechanism (6) comprises a guide assembly (61), a rotating shaft (62), a rotating wheel (63), a grinding belt (64), a second driving motor (65) and a connecting plate (66). The guide assembly (61) is provided in two pieces. The guide assembly (61) comprises a guide rail (611), a first slider (612), a second slider (613), a pressure sensor (614) and an elastic member (615). The guide rail (611) is fixedly mounted on the base (1). The first slider (612) and the second slider (613) are slidably mounted on the guide rail (611). One end of the pressure sensor (614) is connected to the second slider (613), and the other end is connected to the elastic member (615). The first slider (612) is connected to the second slider (614), the other end of the elastic member (615) is connected to the first slider (612); the two first sliders (612) are both rotatably mounted with a rotating shaft (62), the upper ends of the two rotating shafts (62) are both extended to the top of the top plate (3) and mounted on the rotating wheel (63), a grinding belt (64) is installed between the two rotating wheels (63), and the top plate (3) is provided with a first long opening (31) for the rotating shaft (62) to move; a mounting plate is fixed to one of the first sliders (612), a second driving motor (65) is installed on the mounting plate, and the second driving motor (65) is transmission-connected to an adjacent rotating shaft (62); the two second sliders (613) are fixedly connected via a connecting plate (66); The spacing adjustment mechanism (5) drives the connecting plates (66) of the two grinding mechanisms (6) to move towards or away from each other.

2. The automatic wood board edge grinding device according to claim 1, characterized in that: The steering mechanism (4) further comprises a rotating joint (46) and a negative pressure tube. The negative pressure source (47) is fixedly mounted on the base (1). The lower end of the hollow shaft (43) is connected to the negative pressure tube via the rotating joint (46), and the other end of the negative pressure tube is connected to the negative pressure source (47).

3. The automatic wood board edge grinding device according to claim 1, characterized in that: A first driving gear (48) is mounted on the output end of the first driving motor (44), and a first driven gear (49) meshingly connected to the first driving gear (48) is mounted on the hollow shaft (43).

4. The automatic wood board edge grinding device according to claim 1, characterized in that: A second driving gear is mounted on the output end of the second driving motor (65), and a second driven gear (67) meshingly connected with the second driving gear is mounted on the rotating shaft (62) adjacent to the second driving motor (65).

5. The automatic wood board edge grinding device according to claim 1, characterized in that: The spacing adjustment mechanism (5) comprises a mounting seat (51), a double-rotation screw rod (52), a nut pair (53), a third drive motor (54), a third driving gear (55), and a third driven gear (56). The mounting seat (51) and the third drive motor (54) are both fixedly mounted on the base (1). Two mounting seats (51) are provided. A double-rotation screw rod (52) is rotatably mounted between the two mounting seats (51). Nut pairs (53) are threadedly mounted on two screw rod sections of the double-rotation screw rod (52) that rotate differently. The two nut pairs (53) are respectively fixedly connected to two connecting plates (66). A third driven gear (56) is fixed on a middle bare rod section of the double-rotation screw rod (52). A third driving gear (55) meshingly connected to the third driven gear (56) is mounted on the output end of the third drive motor (54).

6. The automatic wood board edge grinding device according to claim 1, characterized in that: The grinding mechanism (6) further comprises a stopper (68), a connecting rod (69) and a transverse plate, wherein the stopper (68) is located inside the grinding belt (64), the stopper (68) and the grinding belt (64) are arranged in cooperation, the two first sliding blocks (612) are both fixedly mounted with a transverse plate, the transverse plates are both fixedly mounted with a connecting rod (69), the upper end of the connecting rod (69) extends above the top plate (3) and is fixedly connected to the stopper (68); the top plate (3) is provided with a second long strip opening (32) for the connecting rod (69) to move.

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