Safety linkage triggering structure of SMT printing machine

Abstract

The utility model discloses a safety linkage triggering structure of an SMT printing machine. The safety linkage triggering structure comprises two opposite connecting plates arranged at intervals. The two ends of the movable baffle are movably connected to the two connecting plates correspondingly, and the movable baffle can be pushed by external force to move upwards and move downwards to reset under the action of the gravity of the movable baffle after the external force is relieved; the transmitting sensor and the receiving sensor are respectively arranged on the two connecting plates, and the transmitting sensor and the receiving sensor are oppositely arranged; the two shielding plates are connected to the two ends of the movable baffle respectively, extend in the vertical direction and correspond to the transmitting sensor and the receiving sensor in a one-to-one mode, and an avoiding through hole is formed in any shielding plate. A safety linkage trigger structure with a double protection function is formed by a transmitting sensor, a receiving sensor, a movable baffle and a shielding plate together, so that the potential safety hazard that the hands of an operator are injured due to the fact that the operator possibly extends into equipment to take a substrate after avoiding a light curtain or a sensor and the equipment cannot be shut down is solved; and the use safety is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of SMT technology, specifically to a safety interlock triggering structure for an SMT printer. Background Technology

[0002] SMT, short for Surface Mount Technology, is a commonly used electronic manufacturing technology widely applied in the production of various electronic products. The SMT printer is a key piece of equipment in SMT technology, primarily used to precisely apply solder paste to the pads of circuit boards to ensure reliable soldering of subsequent components. Existing SMT printers have inlets and outlets on the frame to facilitate the entry and exit of substrates. However, these inlets and outlets are relatively large, posing a safety hazard if operators reach into them to retrieve substrates during operation. Stopping the machine before each substrate retrieval and restarting it afterward results in low production efficiency. Therefore, this invention addresses this issue. Utility Model Content

[0003] In view of at least one of the above-mentioned technical problems, the purpose of this utility model is to provide a safety interlock trigger structure for SMT printers.

[0004] The technical solution of this utility model is:

[0005] The purpose of this utility model is to provide a safety interlock trigger structure for an SMT printing machine. The SMT printing machine includes a frame, and the front and rear side plates of the frame are respectively provided with inlet and outlet ports for substrate entry and exit. The safety interlock trigger structure is disposed in the front and rear side plates of the frame and corresponds to the positions of the inlet and outlet ports, and includes the following:

[0006] Two opposite and spaced-apart connecting plates are adapted to be connected to the inner side of the front side plate or the rear side plate respectively, corresponding to the two sides of the inlet or outlet.

[0007] A movable baffle is movably connected at both ends to the two connecting plates, and the bottom edge of the movable baffle and the top edge of the inlet or outlet plate define an opening with a variable size. The movable baffle can be pushed by an external force to move vertically upward relative to the two connecting plates, and after the external force is released, it moves vertically downward relative to the two connecting plates to reset under its own gravity.

[0008] The transmitting sensor and the receiving sensor are respectively disposed on the two connecting plates and located below the movable baffle, and the transmitting sensor and the receiving sensor are arranged opposite to each other;

[0009] Two shielding plates are respectively connected to the two ends of the movable baffle and extend vertically, and are set one-to-one with the transmitting sensor and the receiving sensor. Each of the shielding plates has an avoidance through hole.

[0010] When the movable baffle is in its initial position, the lower edge of the movable baffle is lower than the upper edge of the inlet or outlet. Each of the clearance through holes is opposite to the light emitting end of the corresponding transmitting sensor or the light receiving end of the receiving sensor. When the movable baffle is moved upward relative to the two connecting plates by an external force, each of the clearance through holes avoids the light emitting end of the corresponding transmitting sensor or the light receiving end of the receiving sensor, and each of the shielding plates blocks the light emitting end of the corresponding transmitting sensor or the light receiving end of the receiving sensor.

[0011] Preferably, a vertically extending connecting groove is provided above the sensor fixed on any of the connecting plates. Either end of the movable baffle passes through the corresponding connecting groove through a connector and is connected to the slider, or either end of the movable baffle is connected to the slider that slides through the corresponding connecting groove. The size of the connector is smaller than the extension length of the connecting groove through which it passes.

[0012] Preferably, the movable baffle includes a plate-shaped body and connecting bodies integrally formed at both ends of the body. Each connecting body includes a plate-shaped first connecting portion perpendicular to the body and a plate-shaped second connecting portion parallel to the body and not on the same plane. Each first connecting portion is connected to one of the baffles and each second connecting portion is movably connected to the corresponding connecting plate.

[0013] Preferably, any of the shielding plates and the movable baffle are detachably connected, or any of the shielding plates and the movable baffle are an integral structure.

[0014] Preferably, a base plate is provided between the two connecting plates, and the two ends of the base plate are respectively connected to the bottom ends of the two connecting plates.

[0015] Preferably, the base plate is an L-shaped plate and includes a first plate body parallel to any of the connecting plates and a second plate body perpendicular to any of the connecting plates. The bottom ends of the two connecting plates are respectively supported at both ends of the second plate body, and the two connecting plates are respectively connected to both ends of the first plate body.

[0016] Preferably, a fixed baffle is provided on the bottom edge of the inlet and outlet, the upper edge of any fixed baffle is bent inward to form an arc-shaped baffle, and the arc-shaped baffle and the lower edge of the corresponding movable baffle define the opening.

[0017] Preferably, any of the connecting plates is further provided with a plurality of spaced fasteners, and any of the connecting plates is detachably connected to the front side plate or the rear side plate through the plurality of fasteners.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] The safety interlock triggering structure of this utility model for SMT printing machines forms a dual-protection safety interlock triggering structure through the transmission sensor, the receiving sensor, the movable baffle, and the shielding plate. This solves the safety hazard in the prior art where operators may reach into the equipment to retrieve the substrate after avoiding the light curtain or sensor, causing the equipment to fail to stop and resulting in hand injuries to the operators. This greatly improves the safety of use. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the safety interlock triggering structure of the SMT printer according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the connecting plate of the safety interlock trigger structure of the SMT printer according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the movable baffle of the safety interlock triggering structure of the SMT printer according to an embodiment of the present utility model, and a partial enlarged view of part A.

[0024] Figure 4 This is a schematic diagram of the shielding plate of the safety interlock triggering structure of the SMT printer according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the base plate of the safety interlock trigger structure of the SMT printer according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the fixed baffle of the safety interlock triggering structure of the SMT printer according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of an SMT printer that includes the safety interlock triggering structure of this utility model embodiment;

[0028] Figure 8 This is a schematic diagram of the safety interlock triggering structure and the front side plate of this utility model embodiment, with the rear side of the front side plate facing forward.

[0029] Figure 9This is a schematic diagram of the front panel of the SMT printer according to an embodiment of the present invention.

[0030] Wherein: 100, STM printer; 110, front side plate; 111, inlet; 112, opening; 10, connecting plate; 11, connecting groove; 12, connecting hole; 20, movable baffle; 21, body; 22, connecting body; 221, first connecting part; 222, second connecting part; 30, transmitting sensor; 31, receiving sensor; 40, shielding plate; 41, clearance through hole; 50, base plate; 51, first plate body; 52, second plate body; 60, fixed baffle; 61, arc-shaped baffle; 62, slot; 70, slider; 80, fastener. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0032] See Figure 7 The SMT printing machine of this utility model embodiment includes a frame, which includes a front side plate 110 and a rear side plate (not shown) arranged opposite each other. The front side plate 110 has an inlet 111 for the substrate to be processed to enter the machine, and the rear side plate has an outlet (not shown) for the processed substrate to be removed. In this utility model embodiment, both the inlet 111 and the outlet are exemplarily as shown below. Figure 9 The square opening shown is an example of a safety interlock triggering structure for SMT printers. In existing technology, the inlet 111 and outlet 112 of an SMT printer generally lack safety interlock triggering structures. When an operator reaches into the outlet 112 to retrieve a substrate, improper operation or error can easily lead to hand injury, posing a significant safety hazard. Alternatively, some designs may only include light curtains or sensors at the inlet 111 or outlet 112, but this approach still has problems. If the opening 112 is large, a hand reaching into the machine through the inlet 111 or outlet 112 may avoid the light curtain or sensor, causing the machine to continue operating and creating a safety hazard. To address this technical problem, this embodiment of the invention provides a safety interlock triggering structure for an SMT printer. This embodiment has two identical safety interlock triggering structures, respectively located at the inlet 111 on the front panel 110 of the SMT printer frame and the outlet on the rear panel. Specifically, for any safety interlock triggering structure, see [link to relevant documentation]. Figures 1 to 9It mainly includes two connecting plates 10, a movable baffle 20, two sensors, and two shielding plates 40. The two connecting plates 10 are located at either end of the length direction of the inlet 111 or the outlet 111, i.e., as shown in the diagram. Figure 8 The left and right ends shown are arranged opposite each other and spaced apart, and both connecting plates 10 are connected to the front side plate 110 or the rear side plate. A movable baffle 20 is arranged between the two connecting plates 10, and both ends of the movable baffle 20 are movably connected to the two connecting plates 10 respectively. The movable baffle 20 has an initial position and a working position relative to the two connecting plates 10. The working position is movable and mainly depends on the magnitude of the external pushing force on the movable baffle 20 or the size of the object extending into the lower edge of the movable baffle 20 and the lower edge of the inlet 111 or outlet 112 (that is, the size of the opening 112 is variable). Specifically, the thickness of the object is different. For example, the size of the opening 112, that is, the distance that the movable baffle 20 is pushed upward by the external force, will also be different. In other words, the working position of the movable baffle 20 will be different, but the difference will not be too large, for example, a difference of a few centimeters to a dozen centimeters. When the external force is released, the movable baffle 20 moves vertically downward relative to the two connecting plates 10 and resets due to its own gravity. This initial position is fixed. It should be noted that in this initial position, the lower edge of the movable baffle 20 is lower than the upper edge of the inlet 111 and outlet of the conventional SMT printer. Thus, when the movable baffle 20 is in the initial position, the height of the opening 112 is smaller than the height of the existing inlet 111 and outlet. The improved SMT printer uses the opening 112 as the board inlet and outlet instead of the inlet 111 on the front plate 110 or the outlet on the rear plate, and the size of the opening 112 is reduced, which is insufficient to allow the operator's hand to pass through. If the operator needs to pass through, they will inevitably touch the movable baffle 20, causing it to move upward. Two sensors are respectively installed on the two connecting plates 10, that is, each connecting plate 10 has one sensor. Specifically, one of the two sensors is a transmitting sensor 30. Figure 1 One example is the sensor on the left), and the other is a receiving sensor 31 (…). Figure 1(Example: the sensor on the right) The two sensors are opposite each other, that is, the light emitting end of the transmitting sensor 30 and the light receiving end of the receiving sensor 31 are opposite each other. The two sensors constitute a photoelectric control switch for controlling the start and stop of the SMT printer. The specific principle of controlling the start and stop of the SMT printer is not described in detail or limited, as it is prior art and not an innovation of this utility model. The two baffles 40 are respectively connected to the two ends of the movable baffle 20, that is, they move with the movement of the movable baffle 20. Each baffle 40 has an avoidance through hole 41. When the movable baffle 20 is in its initial position, one clearance through-hole 41 is opposite to the light emitting end of the transmitting sensor 30, and the other clearance through-hole 41 is opposite to the light receiving end of the receiving sensor 31. That is, the light emitting end of the transmitting sensor 30, the two clearance through-holes 41, and the light receiving end of the receiving sensor 31 are on the same straight line. This means that the light emitted by the transmitting sensor 30 can pass through the two clearance through-holes 41 in a straight line and be received by the light receiving end of the receiving sensor 31. Therefore, the photoelectric control switch will not stop the SMT printer. The SMT printer operates normally. When an object, such as an operator's hand, enters, the movable baffle 20 is pushed by the hand and moves vertically upward relative to the two connecting plates 10. At this time, the two shielding plates 40 move upward with the movable baffle 20, thereby causing the two clearance holes 41 on the two shielding plates 40 to avoid the light emitting end of the emitting sensor 30 and the light receiving end of the receiving sensor 31. That is, the light signal emitted by the light emitting end of the emitting sensor 30 will not be received by the light receiving end of the receiving sensor 31. The photoelectric control switch is activated to stop the SMT printer, making it inactive and in a safe state. Furthermore, in this invention, the clearance holes 41 on the two shielding plates 40 are not located at the ends, but are spaced apart from each other. Figure 4 The bottom end shown has a certain length to ensure that the two baffles 40 can always block the light emitting end of the transmitting sensor 30 and the light receiving end of the receiving sensor 31 when subjected to an external pushing force and moved vertically. This allows the photoelectric control switch to start and stop the SMT printer, ensuring the safety of the operator. The length is not specifically described or limited. Optionally, this length is one-third of the total length of the baffle 40, and this length should be approximately the same as or exceed the thickness of an average person's arm by ten to several tens of centimeters. No specific limitation is made; those skilled in the art can select and design according to the actual operator.

[0033] The safety interlock triggering structure of this utility model embodiment adds a movable baffle 20 and a shield 40 to the existing structure which only sets a light curtain or sensor. The sensor, movable baffle 20 and shield 40 form a safety interlock triggering structure with dual protection function. This solves the safety hazard in the prior art where the operator may avoid the light curtain or sensor and reach into the equipment to take the substrate, which may cause the equipment to fail to stop and injure the operator's hand. This greatly improves the safety of use.

[0034] like Figure 2 As shown, to achieve the movable connection between the movable plate and the connecting plate 10, in this embodiment, a vertically extending connecting groove 11 is formed on the upper end of the side of each connecting plate 10 closest to the other connecting plate 10. The movable plate is connected to a slider 70 via a connector passing through the connecting groove 11. The slider 70 is a square plate with a size larger than the width of the connecting groove 11, and the slider 70 slides in contact with the front surface of the connecting plate 10. The size of the connector is smaller than the extension length of the connecting groove 11, i.e., as shown in the figure. Figure 2 The vertical length shown is also less than the width of the connecting groove 11, allowing the connector to move freely within the connecting groove 11 without interference. In this embodiment, a detachable connection using bolts or other connectors is preferred for easy replacement. When the movable baffle 20 is in its initial position, the connector abuts against the bottom of the connecting groove 11. When the movable baffle 20 is in its highest position, i.e., the top of the connecting groove 11, the shielding plate 40 can still block the light emitting end of the transmitting sensor 30 and the light receiving end of the receiving sensor 31. As an alternative embodiment, either end of the movable baffle 20 can also be connected to a slider 70 (i.e., the slider 70 is a slider 70 with a T-shaped structure) that slides through the corresponding connecting groove 11. The slider 70 can be detachably connected to the movable baffle 20 using, for example, bolts or other connectors, or it can be fixedly connected by, for example, welding.

[0035] The movable baffle 20 in this embodiment of the utility model is not a rectangular flat plate; specifically, as shown... Figure 3 As shown, it includes a rectangular plate-shaped body 21 and two L-shaped connectors 22 integrally formed at the left and right ends of the body 21. Each connector 22 includes a plate-shaped first connecting portion 221 and a plate-shaped second connecting portion 222, wherein the first connecting portion 221 is perpendicular to the body 21, and the second connecting portion 222 is parallel to the body 21 and the second connecting portion 222 and the body 21 are not on the same plane. Specifically, Figure 3The two second connecting portions 222 shown are on the same plane and are located rearward relative to the main body 21. The two first connecting portions 221 are used to connect the two baffles 40 respectively, and the two second connecting portions 222 are used to connect to the two connecting plates 10 respectively. In this embodiment of the present invention, preferably, the connection between the baffle 40 and the first connecting portion 221 of the movable baffle 20 is a detachable connection, such as through fasteners 80 such as bolts.

[0036] As for the baffle 40, such as Figure 4 As shown, it is a long strip-shaped plate, which is preferably detachably connected to the movable baffle 20 by fasteners 80 such as bolts. As an alternative embodiment, it can also be fixedly connected to the movable baffle 20, specifically to the first connecting part 221, or be an integral structure. Modular design facilitates installation and reduces the complexity and inconvenience caused by positioning and alignment during installation.

[0037] As a preferred embodiment, such as Figure 1 and Figure 5 As shown, a base plate 50 is also connected between the two connecting plates 10, with both ends of the base plate 50 supporting and connecting to the bottoms of the two connecting plates 10 respectively. Specifically, in this embodiment, as... Figure 5 As shown, the base plate 50 is an L-shaped plate or angle iron. That is, the base plate 50 includes a first plate 51 and a second plate 52. The first plate 51 is perpendicular to the second plate 52 and parallel to the connecting plate 10, while the second plate 52 is perpendicular to the connecting plate 10. During assembly, the bottom ends of the two connecting plates 10 are respectively supported at both ends of the second plate 52, and the lower ends of the two connecting plates 10 are respectively connected to both ends of the first plate 51 by fasteners 80 such as bolts. The second plate 52 can abut against the inner surface of the front side plate 110 or the rear side plate, or it can be fitted with a clearance fit.

[0038] Preferably, such as Figure 1 As shown, fixed baffles 60 are also provided on the bottom edges of the inlet 111 and the outlet, preferably, as shown in the figure. Figure 6 As shown, the fixed baffle 60 can be fixed by a slot 62 on its bottom surface to engage with the bottom edge of the inlet 111 or outlet. The top edge of the fixed baffle 60 is rounded to form an arc-shaped stop 61, which, together with the lower edge of the movable baffle 20, defines an opening 112. The arc-shaped stop 61 can better protect the operator's hands.

[0039] Preferably, in this embodiment, the connection between the two connecting plates 10 and the front side plate 110 or the rear side plate is a detachable connection. For example, such as... Figure 1 and Figure 2As shown, each connecting plate 10 has four rectangularly arranged connecting holes 12 at its upper end. Each connecting hole 12 is connected to a fastener 80, such as a bolt, to achieve a detachable connection with the front side plate 110 or the rear side plate.

[0040] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A safety interlock trigger structure for an SMT printer, the SMT printer comprising a frame, wherein the front and rear side plates of the frame are respectively provided with an inlet and an outlet for substrate entry and exit, characterized in that, The safety interlock triggering structure is located in the front and rear side plates of the frame and corresponds to the inlet and outlet positions, and includes the following: Two opposite and spaced-apart connecting plates are adapted to be connected to the inner side of the front side plate or the rear side plate respectively, corresponding to the two sides of the inlet or outlet. A movable baffle is movably connected at both ends to the two connecting plates, and the bottom edge of the movable baffle and the top edge of the inlet or outlet plate define an opening with a variable size. The movable baffle can be pushed by an external force to move vertically upward relative to the two connecting plates, and after the external force is released, it moves vertically downward relative to the two connecting plates to reset under its own gravity. The transmitting sensor and the receiving sensor are respectively disposed on the two connecting plates and located below the movable baffle, and the transmitting sensor and the receiving sensor are arranged opposite to each other; Two shielding plates are respectively connected to the two ends of the movable baffle and extend vertically, and are set one-to-one with the transmitting sensor and the receiving sensor. Each of the shielding plates has an avoidance through hole. When the movable baffle is in its initial position, the lower edge of the movable baffle is lower than the upper edge of the inlet or outlet. Each of the clearance through holes is opposite to the light emitting end of the corresponding transmitting sensor or the light receiving end of the receiving sensor. When the movable baffle is moved upward relative to the two connecting plates by an external force, each of the clearance through holes avoids the light emitting end of the corresponding transmitting sensor or the light receiving end of the receiving sensor, and each of the shielding plates blocks the light emitting end of the corresponding transmitting sensor or the light receiving end of the receiving sensor.

2. The safety interlock triggering structure for an SMT printer according to claim 1, characterized in that, A vertically extending connecting groove is provided above the sensor fixed on any of the connecting plates. Either end of the movable baffle passes through the corresponding connecting groove through a connector and is connected to the slider, or either end of the movable baffle is connected to the slider that slides through the corresponding connecting groove. The size of the connector is smaller than the extension length of the connecting groove through which it passes.

3. The safety interlock triggering structure for an SMT printer according to claim 1 or 2, characterized in that, The movable baffle includes a plate-shaped body and connecting bodies integrally formed at both ends of the body. Each connecting body includes a plate-shaped first connecting portion perpendicular to the body and a plate-shaped second connecting portion parallel to the body and not on the same plane. Each first connecting portion is connected to one of the baffles and each second connecting portion is movably connected to the corresponding connecting plate.

4. The safety interlock triggering structure for an SMT printer according to claim 1, characterized in that, The shielding plate and the movable baffle are detachably connected, or the shielding plate and the movable baffle are an integral structure.

5. The safety interlock triggering structure for an SMT printer according to claim 1, characterized in that, A base plate is also provided between the two connecting plates, and the two ends of the base plate are respectively connected to the bottom ends of the two connecting plates.

6. The safety interlock triggering structure for an SMT printer according to claim 5, characterized in that, The base plate is an L-shaped plate and includes a first plate body parallel to any of the connecting plates and a second plate body perpendicular to any of the connecting plates. The bottom ends of the two connecting plates are respectively supported at both ends of the second plate body, and the two connecting plates are respectively connected to both ends of the first plate body.

7. The safety interlock triggering structure for an SMT printer according to claim 1, characterized in that, A fixed baffle is provided on the bottom edge of the inlet and outlet of the plate respectively. The upper edge of any fixed baffle is bent inward to form an arc-shaped baffle. The arc-shaped baffle and the lower edge of the corresponding movable baffle define the opening.

8. The safety interlock triggering structure for an SMT printer according to claim 1, characterized in that, Each of the connecting plates is further provided with a number of spaced fasteners, and each of the connecting plates is detachably connected to the front side plate or the rear side plate through the number of fasteners.

Images