Cam circumferential positioning mechanism and packaging machine

Abstract

This utility model belongs to the field of tobacco machinery technology and discloses a cam circumferential positioning mechanism and a packaging machine. The cam circumferential positioning mechanism includes a support frame, a push rod, a pointer, a scale, an encoder, and a display screen. The rotation of the cam drives the push rod to move along the X-axis. The pointer is connected to the end of the push rod away from the cam. One end of the scale is connected to the top of the support frame, and the other end of the scale is marked with a stroke start line, a stroke middle line, and a stroke end line at intervals. The stroke start line corresponds to the lowest point of the cam's lift, the stroke middle line corresponds to half of the cam's lift, and the stroke end line corresponds to the highest point of the cam's lift. When the pointer is aligned with the stroke middle line, the cam stops rotating, and at this time, the phase degree of the cam is the reference zero-position phase degree. The encoder is used to detect the phase degree of the cam. The display screen is used to display the detected phase degree of the cam. This can reduce the adjustment error of the cam and meet the fine adjustment needs of various cam mechanisms.

Description

Technical Field

[0001] This utility model relates to the field of tobacco machinery technology, and in particular to a cam circumferential positioning mechanism and a packaging machine. Background Technology

[0002] In tobacco packaging machines, multiple cam mechanisms are typically used for mechanical transmission. These mechanisms mainly consist of a camshaft and cams mounted on it. The rotation of the cams drives push rods (actuators) to reciprocate linearly, enabling them to push the hard box label or other parts for packaging. To facilitate synchronous adjustment of each cam mechanism, the cams need to be circumferentially positioned to ensure coordinated and synchronized operation. This ensures that the cams in each mechanism drive the push rods to work together effectively.

[0003] In existing packaging machines, the phase of the cam is typically estimated manually by visual inspection or by measuring with vernier calipers to achieve circumferential positioning of the cam (this positioning position serves as the cam's starting reference zero position). However, the error of this manual positioning method is relatively large, making it difficult to meet the requirements for fine-tuning of each cam mechanism. Utility Model Content

[0004] The purpose of this utility model is to provide a cam circumferential positioning mechanism and a packaging machine, which can accurately position the cam circumferentially and ensure that the circumferential positioning error of the cam is small, so as to meet the fine adjustment requirements of each cam mechanism.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The circumferential positioning mechanism for the cam includes:

[0007] Support frame, extending along the Z-axis;

[0008] A push rod slides along the X-axis through the support frame, and the rotation of the cam can drive the push rod to reciprocate along the X-axis.

[0009] A pointer is connected to the end of the push rod away from the cam, and the pointer extends upward along the Z-axis;

[0010] A scale extends along the X-axis, with one end connected to the top of the support frame. The other end of the scale is marked with a stroke start line, a stroke middle line, and a stroke end line at intervals. The stroke start line corresponds to the lowest point of the cam's lift, the stroke middle line corresponds to half of the cam's lift, and the stroke end line corresponds to the highest point of the cam's lift. When the pointer is aligned with the stroke middle line, the cam stops rotating, and at this time, the cam's phase degree is the reference zero phase degree.

[0011] An encoder is used to detect the phase degree of the cam;

[0012] A display screen, communicatively connected to the encoder, is used to display the phase degree of the cam detected by the encoder.

[0013] Preferably, when the pointer is aligned with the center line of the travel, the reference zero-position phase degree is 141°.

[0014] Preferably, the pointer is arranged in a conical shape facing the top of the scale, and the tip of the conical shape is used to point to the start line of the stroke, the middle line of the stroke, or the end line of the stroke.

[0015] Preferably, the cam circumferential positioning mechanism further includes:

[0016] A fixing block extends along the X-axis, and the bottom end of the pointer abuts against the first end of the fixing block along the X-axis;

[0017] A first fastener is used to securely connect the fixing block and the pointer along the X-axis;

[0018] The second fastener is used to securely connect the fixing block and the push rod along the Z-axis.

[0019] Preferably, the push rod has a base plate protruding along the X-axis at one end facing the fixing block, the second end of the fixing block is placed horizontally on the base plate, and the second fastener is fastened to the fixing block and the base plate along the Z-axis.

[0020] Preferably, the scale includes:

[0021] A horizontal bar and a vertical bar, the horizontal bar extending along the X-axis and the vertical bar extending along the Z-axis, the vertical bar being perpendicularly connected to the horizontal bar to form an L-shaped structure, the vertical bar being placed directly opposite the top surface of the support frame, and the length of the vertical bar being less than the length of the horizontal bar.

[0022] Preferably, the cam circumferential positioning mechanism further includes:

[0023] A positioning element, which is used to pass downward along the Z-axis through the horizontal bar and the vertical bar and to be fastened within the support frame.

[0024] Preferably, the cam circumferential positioning mechanism further includes:

[0025] A bushing is installed in the inner hole of the support frame, and the push rod slides through the bushing along the X-axis.

[0026] Packaging machines, including:

[0027] A cam mechanism, comprising a camshaft and a cam sleeved on the camshaft, wherein the reference zero-position phase degree of the cam is obtained based on the circumferential positioning of the cam circumferential positioning mechanism as described above;

[0028] The manual cranking mechanism drives the camshaft to rotate, and the cam rotates synchronously with the camshaft. When the cam drives the push rod to start moving forward along the X-axis, the pointer points to the stroke start line; when the push rod moves forward along the X-axis to the stroke end line, the pointer points to the stroke end line.

[0029] When the pointer points to the center line of the stroke but the display screen does not show the reference zero phase degree, the manual crank is rotated until the display screen shows the reference zero phase degree, and the cam is rotated relative to the camshaft until the pointer points to the center line of the stroke again, and the camshaft and the cam are locked.

[0030] Preferably, the packaging machine further includes:

[0031] The transmission box, wherein one of its wall panels serves as the support frame.

[0032] The beneficial effects of this utility model are:

[0033] The cam circumferential positioning mechanism of this utility model connects a pointer to the end of the push rod away from the cam, and one end of a scale is connected to the top of the support frame. The other end of the scale is marked with a stroke start line, a stroke middle line, and a stroke end line at intervals. The stroke start line corresponds to the lowest point of the cam's lift, the stroke middle line corresponds to half of the cam's lift, and the stroke end line corresponds to the highest point of the cam's lift. When the cam drives the push rod to move forward along the X-axis, the pointer points to the stroke start line. When the cam drives the push rod to move forward along the X-axis to the stroke end line, the pointer points to the stroke end line. When the push rod moves along the X-axis until the pointer aligns with the stroke middle line, the cam stops rotating, and the cam's phase degree at this point is the reference zero-position phase degree. Simultaneously, the encoder detects the cam's phase degree in real time, and the display screen shows the phase degree detected by the encoder, providing a simple, intuitive, and real-time way to obtain the cam's phase degree, which is beneficial for accurate measurement. By obtaining the reference zero-position phase degree of the cam, the cam immediately stops rotating, thus accurately obtaining the position and state of the cam at the reference zero-position phase degree. That is, by using the above-mentioned cam circumferential positioning mechanism (one cam circumferential positioning mechanism corresponds to one cam for circumferential positioning adjustment), each cam in the packaging machine can be adjusted to the required reference zero-position phase degree (the reference zero-position phase degree of each cam can be the same or different, depending on the actual lift of the cam and the required push demand). Compared with the current method of manually estimating the phase of the cam by visual inspection or manual measurement with vernier calipers, accurate circumferential positioning of the cam can be achieved (the position and state of the cam at this reference zero-position phase degree serve as the starting reference zero position of the cam, that is, based on the accurate pointing positioning between the mutually cooperating pointer and scale, the circumferential positioning error of the cam can be ensured to be small, thereby meeting the fine adjustment requirements of each cam mechanism).

[0034] The packaging machine of this invention, based on the aforementioned cam circumferential positioning mechanism, circumferentially positions the cam to its starting reference zero position, thereby ensuring the coordinated operation of each cam mechanism in the packaging machine and guaranteeing the tobacco packaging effect. Furthermore, since the aforementioned cam circumferential positioning mechanism is mainly used in the maintenance, alignment, and verification of the cam, it can improve the accuracy and efficiency of the maintenance, alignment, and verification of the entire packaging machine. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the cam circumferential positioning mechanism provided in this embodiment of the utility model.

[0036] In the picture:

[0037] 1-Support frame; 11-Inner hole;

[0038] 2-Push rod; 21-Base plate;

[0039] 3 - pointer; 31 - tip;

[0040] 4-Scale; 41-Horizontal bar; 411-Starting line of travel; 412-Middle line of travel; 413-Ending line of travel; 42-Vertical bar;

[0041] 5-Fixing block; 6-First fastener; 7-Second fastener; 8-Positioning component; 9-Shaft sleeve. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] This embodiment provides a cam circumferential positioning mechanism and a packaging machine. The packaging machine includes a cam mechanism, which comprises a camshaft and a cam sleeved on the camshaft. The reference zero-position phase degree of the cam is obtained based on the circumferential positioning of the cam circumferential positioning mechanism to ensure relatively accurate circumferential positioning of the cam. Furthermore, the packaging machine includes multiple cam mechanisms, and the cam of each cam mechanism is circumferentially positioned and adjusted by a corresponding cam circumferential positioning mechanism, enabling the cams of each cam mechanism to work together in a coordinated manner to smoothly and stably complete the tobacco packaging work. The cam and camshaft are connected and fixed by fixing screws, meaning that under normal circumstances, the camshaft and cam can rotate synchronously. The cam mechanism is a common mechanism in existing packaging machines; therefore, its working principle will not be described in detail here.

[0047] Specifically, such as Figure 1 As shown, the cam circumferential positioning mechanism includes a support frame 1, a push rod 2, a pointer 3, a scale 4, an encoder, and a display screen. The support frame 1 extends along the Z-axis. The push rod 2 slides along the X-axis through the support frame 1. Rotation of the cam drives the push rod 2 to reciprocate along the X-axis, facilitating the push rod 2's coordinated tobacco packaging. The pointer 3 is connected to the end of the push rod 2 furthest from the cam and extends upwards along the Z-axis. The scale 4 extends along the X-axis, with one end connected to the top of the support frame 1 and the other end marked with stroke start lines at intervals. 411. The stroke start line 412 and stroke end line 413 are defined. The stroke start line 411 corresponds to the lowest point of the cam's lift, the stroke start line 412 corresponds to half of the cam's lift, and the stroke end line 413 corresponds to the highest point of the cam's lift. When the pointer 3 is aligned with the stroke start line 412, the cam stops rotating, and the cam's phase degree is at the reference zero position. The encoder is used to detect the cam's phase degree. The display screen is connected to the encoder and displays the cam's phase degree detected by the encoder. Both the encoder and the display screen can use common structures found in existing technologies. The push rod 2 specifically pushes the hard box label paper used for packaging tobacco.

[0048] Compared with the prior art, the circumferential positioning mechanism of the cam in this embodiment changes the specific circumferential positioning method of the cam. The pointer 3 is connected to the end of the push rod 2 away from the cam, and one end of the scale 4 is connected to the top of the support frame 1. The other end of the scale 4 is marked with a stroke start line 411, a stroke middle line 412, and a stroke end line 413 at intervals. The stroke start line 411 corresponds to the lowest point of the cam's lift, the stroke middle line 412 corresponds to half of the cam's lift, and the stroke end line 413 corresponds to the highest point of the cam's lift. When the cam drives the push rod 2 to move forward along the X-axis, the pointer 3 points to the stroke start line 411. When the cam drives the push rod 2 to move forward along the X-axis to the stroke end, the pointer 3 points to the stroke end line 413. When the push rod 2 moves along the X-axis until the pointer 3 aligns with the stroke middle line 412, the cam stops rotating, and the phase degree of the cam at this time is the reference zero-position phase degree. Simultaneously, the encoder detects the phase degree of the cam in real time, and the display screen shows the phase of the cam detected by the encoder in real time. The phase degree of the cam can be obtained simply, intuitively, and in real time, which is beneficial for accurately obtaining the reference zero phase degree of the cam and immediately stopping the cam from rotating. This allows for accurate acquisition of the cam's position and state at the reference zero phase degree. In other words, by using the aforementioned cam circumferential positioning mechanism (one cam circumferential positioning mechanism corresponds to one cam for circumferential positioning adjustment), each cam in the packaging machine can be adjusted to the required reference zero phase degree (the reference zero phase degree of each cam can be the same or different, depending on the actual lift of the cam and the required push). Compared to the current method of manually estimating the phase of the cam by visual inspection or manual measurement with vernier calipers, accurate circumferential positioning of the cam can be achieved (the position and state of the cam at this reference zero phase degree serve as the starting reference zero position of the cam, that is, based on the accurate pointing positioning between the mutually cooperating pointer 3 and scale 4, the circumferential positioning error of the cam can be ensured to be small, thereby meeting the fine adjustment requirements of each cam mechanism).

[0049] It is worth noting that for a cam and push rod 2 with a defined structure, the cam's lift, the lowest point of the lift, half the lift, and the highest point of the lift can all be directly determined. Therefore, the corresponding stroke start line 411, stroke middle line 412, and stroke end line 413 can be accurately marked on the scale 4 according to the specific lift parameters of the cam. Specifically, the cam's lift refers to the radial distance from the cam's profile to the base circle, that is, the maximum distance the follower (push rod 2 in this embodiment) moves forward along the X-axis.

[0050] Specifically, when pointer 3 aligns with the stroke centerline 412, the cam's reference zero-position phase degree is 141°. That is, the cam circumferential positioning mechanism in this embodiment can accurately measure the precise phase degree of the cam at 141° half-lift, thus ensuring the accuracy of the cam's circumferential positioning adjustment. This allows for precise circumferential positioning of the cam, meeting the fine-tuning requirements of each cam mechanism and ensuring the coordinated normal operation of the entire packaging machine. The cam's phase degree specifically refers to the relative positional relationship between the camshaft and crankshaft, usually expressed in angles. The core function of the phase degree is to provide a reference signal for engine cylinder positioning, ensuring accurate ignition and fuel injection timing. Furthermore, different types of camshafts have different phase degrees, which directly affect the engine's power output and fuel economy.

[0051] It is worth noting that since the push rod 2 is driven by a cam, and the motion curve of the cam is relatively smooth at the beginning of its ascent or the end of its descent, the phase degree of the cam changes little at these two stages. Therefore, the phase degree of the cam measured in these two stages is not accurate. When the motion curve of the cam is in the middle position, the speed change of the push rod 2 caused by the rotation of the cam is more obvious. That is, this is the stage where the cam drives the push rod 2 to move at the greatest speed. Therefore, the phase degree of the cam measured in this stage is more accurate. In other words, the method of circumferentially positioning the cam in this embodiment by making the phase degree displayed on the screen 141° (reference zero phase degree) when the pointer 3 is exactly pointing to the center line of the stroke 412 is relatively accurate and reliable.

[0052] Furthermore, such as Figure 1 As shown, the pointer 3 is arranged in a conical shape with its tip 31 pointing towards the scale 4. The tip 31 of the conical structure is used to point to the start line 411, the middle line 412, or the end line 413 of the travel. By having only the tip 31 pointing to the start line 411, the middle line 412, or the end line 413 of the travel, the overlapping area between the pointer 3 and the scale 4 can be reduced, thus avoiding inaccurate pointing of the pointer 3 and improving the accuracy of the pointer 3 pointing to the start line 411, the middle line 412, or the end line 413 of the travel. Here, the specific shape and size of the conical structure are not limited, as long as it ensures that only the tip 31 of the conical structure points to the scale 4.

[0053] Specifically, such as Figure 1As shown, the cam circumferential positioning mechanism also includes a fixing block 5, a first fastener 6, and a second fastener 7. The fixing block 5 extends along the X-axis, and the bottom end of the pointer 3 abuts against the first end of the fixing block 5 along the X-axis. The first fastener 6 is used to fasten the fixing block 5 and the pointer 3 along the X-axis; the second fastener 7 is used to fasten the fixing block 5 and the push rod 2 along the Z-axis. Specifically, the first fastener 6 can be a countersunk screw, the second fastener 7 can be a fastening screw, and the fixing block 5 can be a square block.

[0054] like Figure 1 As shown, by setting up a fixed block 5, a first fastener 6 and a second fastener 7 that cooperate with each other, on the one hand, the detachable connection between the pointer 3 and the push rod 2 can be quickly and easily realized, which is conducive to the quick replacement of the worn pointer 3; on the other hand, the connection structure between the pointer 3 and the push rod 2 can be made simpler and more compact, thereby making the structure of the entire cam circumferential positioning mechanism simpler and more compact.

[0055] Furthermore, such as Figure 1 As shown, the push rod 2 has a base plate 21 protruding along the X-axis at one end facing the fixing block 5. The second end of the fixing block 5 is horizontally placed on the base plate 21, and the second fastener 7 is fastened to the fixing block 5 and the base plate 21 along the Z-axis. On the one hand, this can better ensure the stability of the connection between the push rod 2 and the fixing block 5; on the other hand, it can improve the reliability of the push rod 2's support for the fixing block 5 and the pointer 3, thereby better ensuring the alignment accuracy between the pointer 3 and the scale 4. Specifically, the push rod 2 and the base plate 21 can be an integral structure.

[0056] Specifically, such as Figure 1 As shown, the scale 4 includes a vertical rod 42 and a horizontal rod 41. The vertical rod 42 extends along the Z-axis, and the horizontal rod 41 extends along the X-axis. The vertical rod 42 and the horizontal rod 41 are perpendicularly connected to form an L-shaped structure. The vertical rod 42 is placed directly opposite the top surface of the support frame 1, and the length of the vertical rod 42 is much shorter than the length of the horizontal rod 41. Specifically, the horizontal rod 41 and the vertical rod 42 can be an integral structure.

[0057] By setting up a horizontal bar 41 and a vertical bar 42 that cooperate with each other, and making the horizontal bar 41 relatively long, it is convenient to directly engrave the stroke start line 411, stroke center line 412, and stroke end line 413 on the horizontal bar 41; at the same time, making the vertical bar 42 relatively short ensures good stability of the L-shaped scale 4 on the support frame 1, thereby avoiding the problem of the entire scale 4 being tilted or wobbling on the support frame 1 due to the vertical bar 42 being too long. Here, the specific length dimensions of the horizontal bar 41 and the vertical bar 42 are not limited.

[0058] Furthermore, such as Figure 1As shown, the cam circumferential positioning mechanism also includes a positioning element 8, which is used to pass downward along the Z-axis through the crossbar 41 and the vertical bar 42 and be fastened within the support frame 1. Specifically, the positioning element 8 can be a positioning screw.

[0059] By setting a positioning element 8 between the scale 4 and the support frame 1, on the one hand, accurate positioning between the scale 4 and the support frame 1 can be achieved, thereby ensuring the accuracy of the installation position of the scale 4 on the support frame 1; on the other hand, a stable connection between the scale 4 and the support frame 1 can be achieved.

[0060] Specifically, such as Figure 1 As shown, the cam circumferential positioning mechanism also includes a bushing 9, which is installed in the inner hole 11 of the support frame 1. That is, the bushing 9 is fixedly connected in the inner hole 11 of the support frame 1. The push rod 2 slides through the bushing 9 along the X-axis so that the push rod 2 reciprocates linearly along the bushing 9 on the X-axis.

[0061] By setting the bushing 9, on the one hand, it can provide guidance for the movement of the push rod 2 on the X-axis, so as to ensure the guidance and stability of the reciprocating movement of the push rod 2 on the X-axis; on the other hand, it can provide a limiting function for the push rod 2, so as to ensure that the push rod 2 can only move along the X-axis and no other movement will occur.

[0062] Furthermore, the packaging machine in this embodiment also includes a transmission box, one wall panel of which is the aforementioned support frame 1; that is, no additional structure is needed to serve as the support frame 1, and a wall panel of the existing transmission box in the packaging machine can be used directly as the support frame 1. This saves structural layout space and reduces the number of parts, maximizing resource utilization and thereby improving the overall structural compactness of the packaging machine and reducing production costs. The transmission box can adopt a structure commonly found in existing packaging machines.

[0063] Specifically, the packaging machine also includes a manual crankshaft. When the packaging machine is powered on and the engine is not running, turning the manual crankshaft can drive the camshaft to rotate, and the rotation of the camshaft can drive the cam to rotate synchronously. When turning the manual crankshaft causes the cam to drive the push rod 2 to start moving forward along the X-axis, the pointer 3 points exactly to the stroke start line 411. When turning the manual crank causes the cam to drive the push rod 2 to move forward along the X-axis to the stroke end line, the pointer 3 points exactly to the stroke end line 413.

[0064] Furthermore, when replacing a new cam or during maintenance, calibration, or alignment, if due to unforeseen circumstances the pointer 3 points to the travel center line 412, but the display does not show the reference zero phase degree (141°), it is necessary to first manually rotate the camshaft until the display shows the reference zero phase degree (141°), at which point the manual rotation is stopped; then loosen the fixing screw between the camshaft and the cam, and manually rotate the cam separately to drive the push rod 2 until the pointer 3 points back to the travel center line 412, and then lock the camshaft and the cam with the fixing screw; at this point, the circumferential positioning adjustment of the cam is completed, and the cam in this position and state is taken as the reference zero position, that is, the cam at this time is the cam with the most initial position and state after restoring the factory settings.

[0065] It is worth noting that, under normal circumstances, when the manual crank is turned to drive the push rod 2 to move along the X-axis until the tip 31 of the pointer 3 points exactly to the stroke center line 412, the corresponding phase degree displayed on the screen is 141°; thus, the circumferential positioning adjustment of the cam can be completed.

[0066] In this embodiment, the cam circumferential positioning mechanism connects a pointer 3 to a push rod 2 that reciprocates linearly along the X-axis, aligns the pointer 3 with the stroke centerline 412 on the scale 4, and observes in real time the phase degree of the cam detected by the encoder on the display screen, comparing the displayed phase degree with the cam's reference zero-position phase degree (141°). That is, by measuring the midpoint of the cam's motion curve with the phase degree value displayed on the screen, it is possible to achieve precise circumferential positioning adjustment of the cam, which is beneficial for accurately obtaining the position and state of each cam mechanism under its corresponding reference zero-position phase degree, thereby meeting the fine adjustment requirements of each cam mechanism.

[0067] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cam circumferential positioning mechanism, characterized in that, include: Support frame (1) extends along the Z-axis; The push rod (2) slides along the X-axis through the support frame (1), and the rotation of the cam can drive the push rod (2) to reciprocate along the X-axis; A pointer (3) is connected to the end of the push rod (2) away from the cam, and the pointer (3) extends upward along the Z-axis; A scale (4) extends along the X-axis. One end of the scale (4) is connected to the top of the support frame (1). The other end of the scale (4) is marked with a stroke start line (411), a stroke middle line (412), and a stroke end line (413). The stroke start line (411) corresponds to the lowest point of the cam's lift. The stroke middle line (412) corresponds to half of the cam's lift. The stroke end line (413) corresponds to the highest point of the cam's lift. When the pointer (3) is aligned with the stroke middle line (412), the cam stops rotating. At this time, the phase degree of the cam is the reference zero phase degree. An encoder is used to detect the phase degree of the cam; A display screen, communicatively connected to the encoder, is used to display the phase degree of the cam detected by the encoder.

2. The cam circumferential positioning mechanism according to claim 1, characterized in that, When the pointer (3) is aligned with the travel centerline (412), the reference zero phase degree is 141°.

3. The cam circumferential positioning mechanism according to claim 1, characterized in that, The pointer (3) is set in a conical shape toward the top of the scale (4), and the tip (31) of the conical shape is used to point to the start line (411), the middle line (412), or the end line (413).

4. The cam circumferential positioning mechanism according to any one of claims 1-3, characterized in that, The cam circumferential positioning mechanism further includes: A fixing block (5) extends along the X-axis, and the bottom end of the pointer (3) abuts against the first end of the fixing block (5) along the X-axis; The first fastener (6) is used to fasten the fixing block (5) and the pointer (3) along the X-axis. The second fastener (7) is used to fasten the fixing block (5) and the push rod (2) along the Z-axis.

5. The cam circumferential positioning mechanism according to claim 4, characterized in that, The push rod (2) has a base plate (21) protruding along the X-axis at one end facing the fixing block (5), the second end of the fixing block (5) is placed horizontally on the base plate (21), and the second fastener (7) is fastened to the fixing block (5) and the base plate (21) along the Z-axis.

6. The cam circumferential positioning mechanism according to any one of claims 1-3, characterized in that, The scale (4) includes: A horizontal bar (41) and a vertical bar (42) are provided. The horizontal bar (41) extends along the X-axis and the vertical bar (42) extends along the Z-axis. The vertical bar (42) is perpendicularly connected to the horizontal bar (41) to form an L-shaped structure. The vertical bar (42) is placed directly opposite the top surface of the support frame (1), and the length of the vertical bar (42) is less than the length of the horizontal bar (41).

7. The cam circumferential positioning mechanism according to claim 6, characterized in that, The cam circumferential positioning mechanism further includes: Positioning element (8) is used to pass through the horizontal bar (41) and the vertical bar (42) along the Z-axis and be fastened in the support frame (1).

8. The cam circumferential positioning mechanism according to any one of claims 1-3, characterized in that, The cam circumferential positioning mechanism further includes: A bushing (9) is installed in the inner hole (11) of the support frame (1), and the push rod (2) slides through the bushing (9) along the X-axis.

9. A packaging machine, characterized in that, include: A cam mechanism, comprising a camshaft and a cam sleeved on the camshaft, wherein the reference zero-position phase degree of the cam is obtained based on the circumferential positioning of the cam circumferential positioning mechanism as described in any one of claims 1-8; When the manual crank is turned, the camshaft can be rotated. The cam can rotate synchronously with the camshaft. When the cam drives the push rod (2) to start moving forward along the X-axis, the pointer (3) points to the stroke start line (411). When the push rod (2) moves forward along the X-axis to the stroke end line, the pointer (3) points to the stroke end line (413). When the pointer (3) points to the stroke center line (412) and the display screen does not show the reference zero phase degree, the manual crank is rotated until the display screen shows the reference zero phase degree, and the cam is rotated relative to the camshaft until the pointer (3) points to the stroke center line (412) again, and the camshaft and the cam are locked.

10. The packaging machine according to claim 9, characterized in that, The packaging machine also includes: The transmission box, one of the wall panels of which is the support frame (1).

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