Punching device for feeding belt of shot blasting machine

Abstract

The invention discloses a shot blasting machine feeding belt punching device, and relates to the technical field of shot blasting machine belt punching, the shot blasting machine feeding belt punching device comprises a first station and a second station, the first station comprises two punching tools, an edge pressing plate is arranged on the outer edge of each punching tool, the punching tools and the edge pressing plates slide relatively in the axial direction, and a bearing plate is arranged below a belt and the edge pressing plates; blanking holes corresponding to the punching tools are formed in the bearing plate; the second station comprises two drill rods, a hydraulic cavity is installed under the drill rods, the end of the hydraulic cavity is connected with a piston rod in a sliding mode, the hydraulic cavity is further connected with a bearing frame in a sliding mode, a trimming cutter is installed on the top of the bearing frame, and trimming cutters are installed on the drill rods. Trimming is carried out after punching, so that the right-angle side generated by punching becomes an inclined chamfer or a round chamfer, stress concentration is effectively avoided, cracks are prevented from being generated on the edge of a hole of the belt, and the service life of the belt is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of shot blasting machine belt punching, in particular to a shot blasting machine feeding belt punching device. Background Art

[0002] Shot blasting machine refers to casting equipment that uses high-speed projectiles thrown by the shot blaster to clean or strengthen the surface of castings. The shot blasting machine can simultaneously remove sand, core and clean castings. The motor drives the projectile suspension frame through the belt and transports it to the position of the shot blasting wheel at the same time. The shot blasting wheel rotates at a high speed and shoots out and hits the surface of the workpiece.

[0003] The shot suspension of the shot blasting machine is fixed by bolts and nuts, pre-punched on the belt, and then locked by nuts and spirals, such as Figure 1 and Figure 2 As shown, the main methods of punching holes in the existing belts are punching or drilling. However, no matter which drilling method is used, both ends of the holes in the belt are right-angled sides. The shot hanger has a certain mass when carrying steel shots, so the force of the bolt is always toward one end of the belt length direction, and the belt has a certain thickness, so the force directions of the two ends of the hole are opposite, such as Figure 3 As shown, the belt is tensioned under the action of the transmission wheel, and the edge of the hole is as shown in Figure 3 The two black spots of the belt are stressed, and the right-angle edge is prone to stress concentration. Therefore, during long-term use, the end edge of the bolt installation hole of the shot blasting hanger will have cracks, that is, the hole at the right angle will affect the service life of the belt. For this reason, we propose a punching device for the feeding belt of the shot blasting machine. Summary of the invention

[0004] The object of the present invention is to provide a shot blasting machine feeding belt punching device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a shot blasting machine feeding belt punching device, comprising a first station and a second station, the first station and the second station are arranged in sequence along the belt forward direction, and the distance between the first station and the second station is the distance between two adjacent groups of holes in the belt length direction;

[0006] The first station includes two synchronous punching tools arranged side by side along the width direction of the belt, a pressure plate is arranged on the outer edge of the punching tool, the punching tool and the pressure plate slide relative to each other axially, and a bearing plate is arranged below the belt and the pressure plate, and blanking holes corresponding to the punching tools are arranged on the bearing plate;

[0007] The second workstation includes two drill rods arranged corresponding to the punching tools. A hydraulic chamber containing hydraulic oil is installed directly below the drill rods and under the belt. A piston rod is slidably connected to the end of the central axis of the hydraulic chamber. The upper end of the piston rod is sleeved with the drill rod and rotates synchronously. A support bracket is also slidably connected to the hydraulic chamber along the axial direction. The support bracket and the piston rod are driven by hydraulic oil in a 1:1 ratio and move in opposite directions. A trimming tool that rotates synchronously with the drill rod is installed on the top of the support bracket. A trimming tool is also fixedly installed on the drill rod above the belt.

[0008] Preferably, a synchronous sleeve is rotatably connected in the support bracket via a bearing, the synchronous sleeve and the piston rod are axially slidably sleeved and cannot rotate relative to each other, and the trimming tool is fixedly installed on the end of the synchronous sleeve.

[0009] Preferably, a first extrusion ring which moves synchronously with the synchronous sleeve is arranged above the synchronous sleeve, and a second extrusion ring is rotatably connected to the drill rod.

[0010] Preferably, the first extrusion ring and the second extrusion ring extend in a cylindrical shape away from one end face of the belt and enclose the trimming tool inside. A gap is provided between the first extrusion ring and the synchronous sleeve in the axial direction. After the synchronous sleeve moves up and before the trimming tool contacts the belt, the synchronous sleeve contacts the first extrusion ring and pushes it to move up.

[0011] Preferably, the overall cross-sectional edge line of the synchronous sleeve and the trimming tool mounted thereon decreases in height radially outward from the axis.

[0012] Preferably, the edge line of the trimming tool is concave toward the axis, and the concave curve thereof is adapted to the protrusion of the belt under the extrusion state of the first extrusion ring and the second extrusion ring.

[0013] Preferably, a ball is provided at a contact position between the cylindrically extended lower end surface of the first extrusion ring and the upper end surface of the synchronous sleeve.

[0014] Preferably, the end of the drill rod is connected to at least one group of limit strips extending in the axial direction, and the upper end of the corresponding piston rod is concave to form a groove, and a plurality of ribs distributed at intervals are provided on the surface of the concave groove.

[0015] Preferably, the upper end of the rib is provided with a spiral curved surface, and the spiral curved surface guides the limiting strip into the limiting interval formed by the two ribs.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides two workstations to perform trimming after punching, so that the right-angled edges produced by punching become bevel chamfers or round chamfers, thereby effectively avoiding stress concentration and cracks on the edges of the belt holes, thereby extending the service life of the belt.

[0018] The first station punching of the present invention can effectively suppress the flying of chips because the edge holding plate and the bearing plate, and the second station forms a relatively closed area through the extension of the extrusion ring, so as to effectively isolate the chips during the trimming time and automatically remove them after the trimming is completed, effectively reducing the flying of chips, thereby avoiding the environmental protection and health problems caused by them;

[0019] The trimming of the invention can be performed on both sides at the same time at one workstation, thus effectively improving the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the steel shot hanging rack on the belt;

[0021] Figure 2 This is a structural diagram of the bolt installation status of the steel shot suspension frame;

[0022] Figure 3 It is a schematic diagram of the stress state of the edge of the belt hole caused by the spiral of the steel shot hanging frame in the belt hole;

[0023] Figure 4 Schematic diagram of the overall structure of the two workstations;

[0024] Figure 5 It is a schematic diagram of the enlarged structure of the second station;

[0025] Figure 6 for Figure 5 A schematic diagram of the enlarged structure of the middle A area;

[0026] Figure 7 It is a schematic diagram of the overall structure of the trimming tool;

[0027] Figure 8 It is a schematic diagram of the half-section structure of the piston rod;

[0028] Fig. 9 A schematic diagram of the distribution of one embodiment of the end ribs of the piston rod;

[0029] Fig.10 It is a schematic diagram of the deformation of the belt under the action of the extrusion ring;

[0030] Fig.11 It is the theoretical edge and actual edge line of the belt under the action of the trimming tool.

[0031] In the figure: 1-first station; 2-second station; 101-punching tool; 102-edge holding plate; 103-carrying plate; 104-blank hole; 201-drill rod; 202-hydraulic chamber; 203-piston rod; 204-support bracket; 205-trimming tool; 206-synchronizing sleeve; 207-first extrusion ring; 208-second extrusion ring; 209-limiting strip; 2010-rib. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The present invention provides a technical solution: a punching device for a feeding belt of a shot blasting machine, comprising two stations arranged in front and back, namely a first station 1 and a second station 2, the two stations are in a front and back sequence, the feeding belt is tensioned under the action of a conveying mechanism, and a workbench or a rotating roller is arranged below the belt for interval support, the belt first undergoes a punching process at the first station 1, and then enters the second station 2 for trimming, the first station 1 and the second station 2 are each provided with two groups, which are arranged side by side along the width direction of the belt, because there are generally two bolts on the steel shot suspension frame;

[0034] The first station 1 includes a punching tool 101 installed on the machine tool. The punching tool 101 can be a punch or a drill. Both punching methods are acceptable. A pressure plate 102 is also elastically installed on the machine tool. A through hole is provided in the middle of the pressure plate 102. The pressure plate 102 slides with the punching tool 101 through the through hole so that the two can move relative to each other. Correspondingly, a supporting plate 103 fixed to the workbench is provided just below the pressure plate 102 and under the belt. Blanking holes 104 corresponding to the through holes in the pressure plate 102 are provided on the supporting plate 103. The blanking holes 104 are stepped. The diameter of the upper part is the same as the diameter of the belt to be punched, that is, the diameter of the through hole on the pressure plate 102. The diameter of the lower part is slightly larger than the diameter of the punching tool 101, which is convenient for blanking.

[0035] The second station 2 includes a drill rod 201 installed on the machine tool. The drill rod 201 can move up and down and rotate with the machine. A connecting flange is fixedly provided on the drill rod 201. A trimming tool 205 is fixedly installed through the connecting flange. The trimming tool 205 on the drill rod 201 is located on the upper side of the belt. A hydraulic cavity 202 is arranged on the lower side of the belt and directly below the drill rod 201. The hydraulic cavity 202 is fixedly installed on the workbench. The hydraulic cavity 202 is a rotating double-layer cylindrical body, one end of which is open and the other end is closed, but a connecting hole is provided between the two layers. The piston rod 203 The support bracket 204 is slidably arranged in the middle of the hydraulic cavity 202, and the two are coaxial. Similarly, the support bracket 204 is also coaxially slidably connected to the hydraulic cavity 202, and a closed cavity is formed between the piston rod 203, the hydraulic cavity 202 and the support bracket 204. The closed cavity is filled with hydraulic oil, and the axial cross-sectional area of ​​the hydraulic cavity 202 in the area where the piston rod 203 is connected is the same as the axial cross-sectional area of ​​the hydraulic cavity 202 in the area where the support bracket 204 is connected, so that the piston rod 203 and the support bracket 204 are both 1:1 transmission, and the movement directions are opposite;

[0036] In order to rotate the trimming tool 205 below, the support bracket 204 and the piston rod 203 rotate synchronously, that is, a structure such as an axially slidable limit pin is set between the two to make the two rotate synchronously. Similarly, the end of the piston rod 203 and the lower end of the drill rod 201 also keep synchronous rotation after contact. After the drill rod 201 moves down and hits the end of the piston rod 203, a mechanism that limits the relative rotation of the two can achieve synchronous rotation, such as threaded connection. It can also be achieved through a clamping mechanism. After the drill rod 201 moves down, a lever is pushed, and the other end of the lever moves upward to clamp the drill rod 201 from both sides for synchronization.

[0037] Specifically, after the belt is tensioned, it moves. Initially, only the punching tool 101 moves downward. During the downward movement, the edge pressing plate 102 first contacts the belt and presses it downward, so that the edge pressing plate 102 and the bearing plate 103 clamp the belt. At this time, the tensioning and winding mechanism of the belt also stops moving. As the downward pressure continues, the punching tool 101 contacts the belt, thereby starting to generate holes.

[0038] After the initial hole drilling, the machine tool moves up, and the punching tool 101 and the edge plate 102 leave the belt. At this time, the belt starts to move, and the hole drilled moves to the bottom of the second station 2. At this time, the first station 1 and the second station 2 work at the same time. The first station 1 still drills holes in the above manner, while the second station 2 moves down with the drill rod 201 until the drill rod 201 hits the piston rod 203. At this time, the drill rod 201 starts to rotate with the machine shaft, synchronously driving the piston rod 203, and the machine tool main shaft rotates at the same time. The shaft still moves downward, and the drill rod 201 pushes the piston rod 203 downward. Under the transmission of hydraulic pressure, the support bracket 204 moves upward. At this time, the two trimming tools 205 located on the upper and lower sides of the belt rotate synchronously and move toward each other, while repairing the edges of the two ends of the hole on the belt. The blade of the tool is inclined, thereby producing a chamfer. After reaching the cutting depth of the chamfer, the trimming is completed, and then the drill rod 201 can stop moving and move upward. The drill rod 201 is separated from the piston rod 203, and the piston rod 203 and the support bracket 204 return to their original positions in balance under the action of gravity.

[0039] like Figure 8 and Fig. 9 , further specifically, the connection state between the drill rod 201 and the piston rod 203, that is, the upper end of the piston rod 203 is concave to form a blind hole, and ribs 2010 are arranged at intervals on the inner side wall of the blind hole, and correspondingly, a limit bar 209 is arranged on the side wall of the drill rod 201, and the lower end of the limit bar 209 is spherical, and the upper end surface of the rib 2010 is spherical, and the distance between two adjacent ribs 2010 is just adapted to the limit bar 209, thereby realizing synchronous rotation;

[0040] Because the ribs 2010 need a certain strength, the number is reduced and the width is widened. The distance between two adjacent ribs 2010 remains unchanged. A spiral guide surface is provided at the end of the rib 2010. Figure 8 As shown, the guide limit strip 209 enters the gap between the ribs 2010, thereby synchronously

[0041] See also Figure 4 , Figure 5 and Figure 6The support bracket 204 is divided into two parts, the upper and lower parts, both of which are cylindrical, and the two are fixedly connected in the middle by bolts and other structures. The synchronous sleeve 206 is rotatably connected to the support bracket 204 through a bearing and extends beyond the top of the support bracket 204. A fixed flange is also provided on the top of the synchronous sleeve 206, and the trimming tool 205 is fixedly installed on the fixed flange. Different from the above-mentioned embodiment in which the support bracket 204 rotates, in this embodiment, the support bracket 204 only needs to move up and down, so a limit pin and other structures are provided between it and the hydraulic cavity 202 for sliding but not rotation. The advantage of this method is that it can prevent the end of the support bracket 204 from rotating in the hydraulic cavity 202, thereby affecting the seal, and further, the lower end of the piston rod 203 is also rotatably connected to the piston.

[0042] See also Figure 4 , Figure 5 and Figure 6 Because the belt itself is flexible, if both sides are trimmed at the same time without a pressing mechanism, the edge area of ​​the belt hole will be unstable. Therefore, a pressing mechanism is set in the outer diameter area of ​​the two trimming tools 205, namely the first extrusion ring 207 and the second extrusion ring 208. The two extrusion rings are symmetrical structures and are respectively installed on the drill rod 201 and the synchronous sleeve 206. There is a hollow structure between the second extrusion ring 208 and the synchronous sleeve 206 to facilitate the chips to slide off from here. The two extrusion rings press the belt from the upper and lower layers of the belt respectively to facilitate more stable trimming.

[0043] refer to Figure 6 The first extrusion ring 207 and the second extrusion ring 208 are extended at the separated ends to form a cone-shaped cylindrical structure. The two are quasi-symmetrical structures, that is, they have different partial structures. The second extrusion ring 208 is fixedly installed on the flange on the drill pipe 201, while the first extrusion ring 207 is axially slidably set on the workbench, and the lower end of the first extrusion ring 207 does not contact the upper end surface of the synchronous sleeve 206 in the initial state. There is a certain gap between the two, which is used to discharge the chips. The two extended extrusion rings are not only used to stabilize the belt, but also can play a role in dust prevention. The two extrusion rings wrap the trimming tool 205, thereby forming a relatively closed structure in the working state, and the chips are only retained in the relatively closed space;

[0044] Specifically, during the downward movement of the drill rod 201, after contacting the piston rod 203, the synchronous sleeve 206 first moves up a short distance and then contacts the first extrusion ring 207. At this time, the distance between the lower end surface of the second extrusion ring 208 and the upper surface of the belt is the same as the distance between the first extrusion ring 207 and the lower surface of the belt. Then, the first extrusion ring 207 moves up under the action of the synchronous sleeve 206. The second extrusion ring 208 is in an inverted cone shape, which allows the raised chips to pass through the belt hole under the action of gravity and enter the first extrusion ring 207, and then be discharged when the synchronous sleeve 206 moves down, which can effectively prevent the chips from flying during trimming.

[0045] Furthermore, in order to make the rotation between the first extrusion ring 207 and the synchronization sleeve 206 more stable, balls are arranged on the contact surfaces of the two, and rolling friction replaces static friction, and the balls are preferably rotatably arranged on the outer side of the lower end of the extended part of the first extrusion ring 207 (not shown in the figure).

[0046] See also Figure 6 In order to better discharge the chips stored in the space formed by the synchronous sleeve 206, the trimming tool 205 and the first extrusion ring 207, the trimming tool 205 and the synchronous sleeve 206 are tilted downward along the radial outward as a whole, so that the chips can slide down under the action of gravity. The overall tilted state means that the height decreases gradually, but it is not necessarily complete and continuous. It can drop suddenly, but it cannot form a groove.

[0047] Furthermore, a receiving hopper may be provided at the outer edge of the gap between the first extrusion ring 207 and the synchronous sleeve 206 to receive the crushed chips.

[0048] See also Figure 7 , Fig.10 and Fig.11 When the cutting edge of the tool is set to an inclined straight line, an oblique chamfer is formed at the end edge of the belt hole, such as Fig.11 After the extrusion ring is set, the belt will be partially deformed because of the pressure of the extrusion ring. Fig.10 The solid line shown in the figure, at this time, the tool will no longer produce a chamfer on the belt, but will produce a chamfer as shown in the figure Fig.11 The dotted line in the figure shows an arc chamfer that is similar to a round chamfer. Compared with the arc chamfer, there is still an angle (obtuse angle) between the two end edges of the oblique chamfer. Although it is less likely to cause stress concentration than a right angle, it is still not as continuous as a rounded corner. Therefore, the shape of the trimming tool 205 can be adjusted according to the deformation amount of the extrusion ring, so that the closer the formed angle is to a round chamfer, the better. Because the extrusion of the extrusion ring is closer to the empty surface of the belt, the greater the deformation (convexity). Therefore, the edge line of the trimming tool 205 is concave to match the deformation amount of the belt, which can produce a chamfer shape closer to a round chamfer.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shot blasting machine feeding belt punching device, comprising a first station (1) and a second station (2), characterized in that: The first workstation (1) and the second workstation (2) are arranged in sequence along the forward direction of the belt, and the distance between the two is the distance between two adjacent groups of holes in the length direction of the belt; The first workstation (1) comprises two synchronous punching tools (101) arranged side by side along the width direction of the belt, a pressure plate (102) is arranged on the outer edge of the punching tool (101), the punching tool (101) and the pressure plate (102) slide relative to each other axially, and a bearing plate (103) is arranged below the belt and the pressure plate (102), and a blanking hole (104) corresponding to the punching tool (101) is arranged on the bearing plate (103); The second workstation (2) comprises two drill rods (201) arranged corresponding to the punching tool (101); a hydraulic chamber (202) containing hydraulic oil is installed directly below the drill rods (201) and below the belt; a piston rod (203) is slidably connected to the end of the central axis of the hydraulic chamber (202); the upper end of the piston rod (203) is sleeved with the drill rod (201) and rotates synchronously; a support bracket (204) is also slidably connected to the hydraulic chamber (202) along the axial direction; the support bracket (204) and the piston rod (203) are driven by hydraulic oil in a 1:1 ratio and move in opposite directions; a trimming tool (205) that rotates synchronously with the drill rod (201) is installed on the top of the support bracket (204); and the trimming tool (205) is also fixedly installed on the drill rod (201) above the belt.

2. A shot blasting machine feeding belt punching device according to claim 1, characterized in that: A synchronous sleeve (206) is rotatably connected to the support frame (204) via a bearing. The synchronous sleeve (206) and the piston rod (203) are axially slidably sleeved and cannot rotate relative to each other. The trimming tool (205) is fixedly mounted on the end of the synchronous sleeve (206).

3. A shot blasting machine feeding belt punching device according to claim 2, characterized in that: A first extrusion ring (207) is arranged above the synchronous sleeve (206) and moves synchronously therewith, and a second extrusion ring (208) is rotatably connected to the drill rod (201).

4. A shot blasting machine feeding belt punching device according to claim 3, characterized in that: The first extrusion ring (207) and the second extrusion ring (208) extend away from one end face of the belt in a cylindrical shape and enclose the trimming tool (205) therein; a gap is provided between the first extrusion ring (207) and the synchronous sleeve (206) in the axial direction; after the synchronous sleeve (206) moves upward and before the trimming tool (205) contacts the belt, the synchronous sleeve (206) contacts the first extrusion ring (207) and pushes it upward.

5. A shot blasting machine feeding belt punching device according to claim 3, characterized in that: The overall cross-sectional edge line of the synchronous sleeve (206) and the trimming tool (205) mounted thereon decreases in height radially outward from the axis.

6. A shot blasting machine feeding belt punching device according to claim 3, characterized in that: The edge line of the trimming tool (205) is concave toward the axis, and its concave curve is adapted to the protrusion of the belt in the extrusion state of the first extrusion ring (207) and the second extrusion ring (208).

7. A shot blasting machine feeding belt punching device according to claim 4, characterized in that: A ball is provided at a contact position between the cylindrically extended lower end surface of the first extrusion ring (207) and the upper end surface of the synchronization sleeve (206).

8. The punching device for feeding belt of shot blasting machine according to claim 1, characterized in that: The end of the drill rod (201) is connected to at least one group of limit strips (209) extending in the axial direction, and the upper end of the corresponding piston rod (203) is concave to form a groove, and a plurality of ribs (2010) distributed at intervals are provided on the surface of the concave groove.

9. A shot blasting machine feeding belt punching device according to claim 8, characterized in that: The upper end of the rib (2010) is provided with a spiral curved surface, and the spiral curved surface guides the limiting strip (209) into the limiting interval formed by the two ribs (2010).

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