Precision casting shell making machine

Abstract

The invention relates to the technical field of casting, in particular to a precision casting shell making machine which comprises a hoisting part. The hoisting part comprises a driving piece and a hoisting mechanism, the hoisting mechanism is mounted on the driving piece, and the hoisting mechanism comprises a shell, a hanging basket, a sensing assembly and two hanging rods. The two hanging rods are eccentrically arranged on the shell and can rotate along with the shell. The hanging basket comprises a main rod and two hanging arms, and the main rod is connected with a fired mold; and the suspension arm is connected with a lifting hook on a corresponding suspension rod. The induction assembly is installed on the shell. According to the precision casting shell making machine, the axial relative displacement of the suspender is monitored through the induction assembly, eccentricity of a fired mold is fed back, after workpieces in the same batch are cast for multiple times, position exchange is achieved through rotation of the suspender and the shell, the suspender on the high-abrasion side and the suspension arm on the low-abrasion side can be matched again, the abrasion degree of the two sides is balanced, and the precision casting shell making machine is suitable for large-scale production. And the service life of the whole hoisting part is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a precision casting shell making machine. BACKGROUND

[0002] Precision casting is the core process of obtaining high-precision and high-surface-finish castings. Compared with traditional sand casting, precision casting has smaller size error and better surface quality, and is widely used in fields such as aerospace, automobile manufacturing and precision instruments that require high precision of parts.

[0003] Precision casting includes various processes such as investment casting, ceramic mold casting and metal mold casting. Among them, investment casting (also known as lost wax casting) is one of the most widely used processes because it is suitable for complex structure castings and has high precision. The core process is as follows: a wax or other material is used to make a melting mold; a refractory coating is repeatedly applied on the surface of the melting mold, and refractory sand is scattered, and a mold shell is formed after hardening and drying; the internal melting mold is removed to form a mold cavity; the mold shell is baked to improve its strength and remove residual melting mold material; metal liquid is poured; after the metal liquid solidifies and cools, the shell is removed and the sand is cleaned to obtain the finished product, and if necessary, heat treatment, cold working or surface treatment is required.

[0004] In the shell making process of investment casting, the shell making machine is a key equipment for automatic coating and sanding. It drives the hanging basket loaded with wax mold group by a mechanical hand, completes the processes of refractory coating and refractory sand scattering according to the preset program, and greatly improves the shell making efficiency and consistency. However, during the operation of the existing shell making machine, the eccentricity of the melting mold mass will cause unavoidable relative movement at the connection part of the mechanical hand and the wax mold group hanging basket, and this relative movement will cause continuous wear at the connection part, which not only shortens the service life of the hanging basket and affects the stable use of the hanging basket, but also increases the scrap rate of shell making. SUMMARY

[0005] The present application provides a precision casting shell making machine to solve the problem that the existing precision casting shell making machine has relative movement at the connection part of the mechanical hand and the wax mold group hanging basket during use, which causes continuous wear at the connection part, affects the stable use of the hanging basket, and increases the scrap rate of shell making.

[0006] The application discloses a precision casting shell making machine which adopts the following technical scheme: a precision casting shell making machine comprises a hoisting part, a coating part and a sanding part; the hoisting part comprises a driving member and a hoisting mechanism, the hoisting mechanism is installed on the driving member, and the hoisting mechanism comprises a shell, a basket, a sensing assembly and two lifting rods; the shell is column-shaped, the shell is installed on the driving member, and the driving member is used for driving the shell to rotate about its own axis; the two lifting rods are eccentrically arranged on the shell and can rotate with the shell, the axes of the lifting rods are parallel to the axis of the shell, and the two lifting rods are symmetrically arranged about the central axis of the shell in an initial state; the lifting rods can move along the axial direction of the shell and can rotate about their own axes relative to the shell; the basket comprises a main rod and two lifting arms, the main rod is coaxially arranged with the shell, and a molten mold is connected to the main rod; the axes of the lifting arms are perpendicular to the axis of the main rod, the two lifting arms are coaxially arranged and are both installed on the main rod; the lifting arms are arranged in one-to-one correspondence with the lifting rods, hooks are arranged on the lifting rods, and the lifting arms are connected with the hooks on the lifting rods corresponding thereto; the sensing assembly is installed on the shell, relative movement of the two lifting rods in the axial direction thereof can drive the sensing assembly to act, and the sensing assembly is used for monitoring the relative displacement of the two lifting rods in the axial direction thereof; the coating part is used for coating the molten mold with refractory coating; and the sanding part is used for sanding the molten mold coated with refractory sand.

[0007] Further, two first hydraulic cylinders are arranged in the shell, the first hydraulic cylinders are arranged in one-to-one correspondence with the lifting rods, the lifting rods are arranged at the output ends of the first hydraulic cylinders and extend out of the shell along the axial direction of the first hydraulic cylinders, and the lifting rods can rotate relative to the first hydraulic cylinders and can synchronously move with the output ends of the first hydraulic cylinders.

[0008] Further, the sensing assembly comprises a sensing hydraulic cylinder, the sensing hydraulic cylinder is installed in the shell, the sensing hydraulic cylinder comprises a first cylinder body and a sensing plate, the sensing plate is installed in the first cylinder body and is in sliding sealing with the first cylinder body, the sensing plate divides the first cylinder body into a first chamber and a second chamber, and the first chamber and the second chamber are both filled with hydraulic oil; the first hydraulic cylinder comprises a second cylinder body and a piston rod, the piston rod is in sliding sealing with the second cylinder body, and the first chamber and the second chamber are in communication with the chambers in which the piston rods of the two first hydraulic cylinders are located; a position sensor is arranged in the first chamber or the second chamber, the position sensor can monitor the position of the sensing plate and convert the position into an available output signal to be transmitted to an externally connected control system.

[0009] Further, the lifting rods are connected with the output ends of the first hydraulic cylinders through rotating columns, the rotating columns are coaxially arranged with the lifting rods, annular protrusions are coaxially and fixedly arranged on the peripheral wall surfaces of the rotating columns, and the output ends of the first hydraulic cylinders are provided with annular grooves for rotatingly matching with the annular protrusions.

[0010] Further, the first hydraulic cylinder comprises a second cylinder body and a piston rod, the piston rod comprises a plate part and a rod part fixedly connected with the plate part, the plate part is in sliding sealing with the second cylinder body, the plate part separates the second cylinder body into two independent chambers, the two chambers are filled with hydraulic oil, the rod part penetrates one of the two chambers and extends out of the second cylinder body, and the chamber in which the rod part is located is referred to as an adjusting chamber.

[0011] Further, the first cylinder body is provided with a first communication port and a second communication port for communicating with the first chamber, and the first cylinder body is also provided with a third communication port and a fourth communication port for communicating with the second chamber; the adjusting chambers of the two first hydraulic cylinders are respectively communicated with the first communication port and the third communication port, and the second communication port and the fourth communication port are respectively connected with external oil lines.

[0012] Further, the hoisting mechanism further comprises a top rod, the top rod is installed on the shell and coaxial with the shell, the top rod can move along the axial direction of the shell and can rotate synchronously with the shell, the top rod is located on the side of the main rod close to the shell in the axial direction of the shell, two abutting balls are arranged on the end of the top rod close to the main rod in the axial direction of the top rod, and an abutting surface for abutting with the abutting balls is arranged on the main rod, and the abutting surface is an inclined surface.

[0013] Further, a second hydraulic cylinder is arranged in the shell, and the top rod is arranged at the output end of the second hydraulic cylinder and extends out of the shell in the axial direction of the top rod.

[0014] Further, the hoisting mechanism further comprises a transmission member, the transmission member is used for driving the two lifting rods to rotate around their own axes.

[0015] Further, the driving member is a mechanical arm.

[0016] The beneficial effects of the present application are: the precision casting shell forming machine of the present application is provided with a hoisting part, a coating part and a sanding part, which cooperate during casting, the axial relative displacement of the lifting rod is monitored by the sensing assembly, the eccentricity of the investment mold is fed back, and after casting the same batch of workpieces for multiple times, the position exchange is realized through the self-rotation of the lifting rod and the shell, the high-wear side lifting rod and the low-wear side lifting arm can be matched again, the wear degree of the two sides is balanced, the single lifting rod is prevented from being scrapped in advance due to excessive wear, and the service life of the whole hoisting part is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 Fig. 1 is a schematic diagram of the overall structure of an embodiment of the precision casting shell making machine of the present application; Figure 2 Fig. 2 is a diagram of the state of the lifting part after lifting the mold of an embodiment of the precision casting shell making machine of the present application; Figure 3 Fig. 3 is a diagram of the state of the lifting mechanism before lifting the mold of an embodiment of the precision casting shell making machine of the present application; Figure 4 Fig. 4 is a diagram of the state of the lifting mechanism after lifting the mold of an embodiment of the precision casting shell making machine of the present application; Figure 5 Fig. 5 is a schematic diagram of the partial structure of an embodiment of the precision casting shell making machine of the present application; Figure 6 Fig. 6 is a sectional view of Figure 5 Fig. 7 is an enlarged view of A in Fig. 6; Figure 7 Fig. 8 is an enlarged view of B in Fig. 6; Figure 5 Figure 8 Fig. 9 is a sectional view of the partial structure of an embodiment of the precision casting shell making machine of the present application; Figure 9 Fig. 10 is a sectional view of the inductive hydraulic cylinder of an embodiment of the precision casting shell making machine of the present application; Figure 10 Fig. 11 is a diagram of the state of the lifting mechanism after lifting the mold with holes of an embodiment of the precision casting shell making machine of the present application; Figure 11 Fig. 12 is a diagram of the state of the lifting basket deflection after lifting the mold with holes of an embodiment of the precision casting shell making machine of the present application.

[0019] Fig. 1 is a schematic diagram of the overall structure of an embodiment of the precision casting shell making machine of the present application; DETAILED DESCRIPTION

[0020] ​Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the protection scope of the present application.

[0021] An embodiment of the precision casting shell making machine of the present application is shown in Figures 1 to 11 .

[0022] The precision casting shell making machine comprises a hoisting part 100, a coating part 200 and a sanding part 300. The hoisting part 100 comprises a driving member 110 and a hoisting mechanism mounted on the driving member 110. The hoisting mechanism comprises a shell 120, a hanging basket 130, a sensing assembly and two hoisting rods 140. The shell 120 is cylindrical, and is mounted on the driving member 110. The driving member 110 is used to drive the shell 120 to rotate about its own axis. The two hoisting rods 140 are eccentrically arranged on the shell 120 and can rotate with the shell 120. The axes of the hoisting rods 140 are parallel to the axis of the shell 120. In the initial state, the two hoisting rods 140 are symmetrically arranged about the central axis of the shell 120. The hoisting rods 140 can move along the axial direction of the shell 120 and can rotate about their own axes relative to the shell 120. The hanging basket 130 comprises a main rod 131 and two hanging arms 132. The main rod 131 is coaxially arranged with the shell 120, and a lost foam 400 is connected to the main rod 131 through a hanging block 133. The axes of the hanging arms 132 are perpendicular to the axis of the main rod 131. The two hanging arms 132 are coaxially arranged and are fixedly mounted on the main rod 131, so that the hanging basket 130 has a cross-shaped structure. The hanging arms 132 are arranged in one-to-one correspondence with the hoisting rods 140. The hoisting rods 140 are provided with hooks 141, and the hanging arms 132 are connected to the hooks 141 on the hoisting rods 140 corresponding thereto. The sensing assembly is mounted on the shell 120. The relative movement of the two hoisting rods 140 in the axial direction can cause the sensing assembly to act. The sensing assembly is used to monitor the relative displacement of the two hoisting rods 140 in the axial direction. The coating part 200 is used to coat the lost foam 400 mounted on the main rod 131 with refractory coating. The sanding part 300 is used to sand the lost foam 400 coated with refractory sand. The coating part 200 and the sanding part 300 are prior art, and will not be described in detail here.

[0023] Further, the driving member 110 is a mechanical arm. In use, the mechanical arm is used to control the shell 120 to rotate about its own axis.

[0024] In this embodiment, the hoisting part 100, the coating part 200 and the sanding part 300 are cooperated. In casting, the lost foam 400 is first mounted on the main rod 131 of the hanging basket 130, and then the hanging arms 132 are lifted by the hooks 141. Referring toFigure 3 At this time, the boom 140 and the boom arm 132 are perpendicular to each other.

[0025] Then, the housing 120 is controlled by the driving member 110 to drive the boom 140 to rotate, so that the hook 141 is rotated by 90° relative to the boom arm 132. Then, the housing 120 is controlled by the driving member 110 to drive the boom 140 and the basket 130 to rise, and the mold 400 is hoisted, as shown in Figure 4 .

[0026] If the mold 400 does not have eccentricity, the boom arm 132 and the boom 140 are in a balanced state, and the boom 140 and the boom arm 132 do not move, and the sensing assembly does not act. If the mold 400 has eccentricity, the mold 400 applies inconsistent forces to the corresponding boom 140 through the boom arm 132, and the boom 140 and the boom arm 132 will be unbalanced, and the two booms 140 will generate relative displacement in the axial direction thereof. At this time, the sensing assembly is started, and the relative displacement of the two booms 140 in the axial direction thereof is monitored by the sensing assembly. Subsequently, the basket 130 and the mold 400 are transferred to the coating part 200, and the housing 120 is rotated about its own axis by the driving member 110, and the refractory coating is coated. Then, the mold 400 is transferred to the sanding part 300, and the refractory sand is applied to the coated mold 400, and the coating and sanding process is repeated until the mold shell is prepared.

[0027] The unbalance of the boom 140 and the boom arm 132 will result in inconsistent wear between the two booms 140 and the boom arms 132 corresponding thereto. That is, after one casting, the wear on the heavier side is greater than that on the lighter side. For the convenience of description, the two booms 140 are referred to as a first boom and a second boom, and the two boom arms 132 are referred to as a first arm and a second arm. In the initial state, the first boom is connected to the first arm, and the second boom is connected to the second arm. If the first boom moves relative to the second boom after connecting the mold 400, it can be considered that the first boom side is heavier, and the second boom side is lighter, and the wear between the first boom and the first arm is relatively greater.

[0028] When casting the same batch of workpieces, after casting for a period of time, the basket 130 is first disassembled, and then the two booms 140 are driven to rotate by 180°, so that the hooks 141 of the first boom and the second boom face away from the boom arms 132. Then, the first boom and the second boom are driven to revolve by 180° by the driving member 110, so that the first boom and the second boom exchange positions, and the positions of the two boom arms 132 remain unchanged. When used next time, the first boom will be connected to the second arm, and the second boom will be connected to the first arm, so that if the wear between the first boom and the first arm is greater in the initial state, the wear between the second boom and the first arm will be greater after exchange. The high-wear-side boom 140 and the low-wear-side boom arm 132 are re-matched, the wear degree of both sides is balanced, and the service life of the entire hoisting part 100 is prolonged.

[0029] In a further embodiment, two first hydraulic cylinders 150 are arranged in the housing 120, and the first hydraulic cylinders 150 are arranged one-to-one with the booms 140, and the booms 140 are arranged at the output ends of the first hydraulic cylinders 150 and extend out of the housing 120 along the axial directions of the first hydraulic cylinders 150. The booms 140 can rotate relative to the first hydraulic cylinders 150 and can move synchronously with the output ends of the first hydraulic cylinders 150.

[0030] In a further embodiment, the sensing assembly includes a sensing hydraulic cylinder 160 arranged in the housing 120, and the sensing hydraulic cylinder 160 includes a first cylinder body 161 and a sensing plate 162 arranged in the first cylinder body 161 and in sliding sealing with the first cylinder body 161. The sensing plate 162 divides the first cylinder body 161 into a first chamber 163 and a second chamber 164, and the first chamber 163 and the second chamber 164 are both filled with hydraulic oil. The first hydraulic cylinder 150 includes a second cylinder body 151 and a piston rod 152 in sliding sealing with the second cylinder body 151. The first chamber 163 and the second chamber 164 are respectively in communication with the chambers in which the piston rods 152 of the two first hydraulic cylinders 150 are arranged. A position sensor is arranged in the first chamber 163 or the second chamber 164, and the position sensor can monitor the position of the sensing plate 162 and convert the position into an available output signal transmitted to an externally connected control system.

[0031] In the embodiment, the boom 140 is connected to the output end of the first hydraulic cylinder 150 through a rotating column 142, the rotating column 142 is coaxially arranged with the boom 140, an annular protrusion is coaxially and fixedly arranged on the outer peripheral wall surface of the rotating column 142, and the output end of the first hydraulic cylinder 150 is provided with an annular groove for rotating cooperation with the annular protrusion. Moreover, the rotating column 142 is connected to the boom 140 through a pin shaft.

[0032] Specifically, the piston rod 152 includes a plate portion and a rod portion fixedly connected with the plate portion, the plate portion is in sliding sealing with the second cylinder body 151, and the plate portion divides the second cylinder body 151 into two independent chambers, and the two chambers are both filled with hydraulic oil. The rod portion penetrates through one of the chambers and extends out of the second cylinder body 151, and the chamber in which the rod portion is arranged is referred to as an adjusting chamber, and the first chamber 163 and the second chamber 164 are respectively in communication with the adjusting chambers corresponding thereto.

[0033] In use, when the mold 400 itself has eccentricity, the two hangers 140 are relatively displaced in the axial direction thereof, and the hanger 140 on the heavier side pulls the piston rod 152 of the first hydraulic cylinder 150 corresponding thereto, and the hydraulic oil in the adjusting chamber of the first hydraulic cylinder 150 is extruded into the first chamber 163 or the second chamber 164. Assuming that the hydraulic oil is extruded into the first chamber 163, the volume of the hydraulic oil in the first chamber 163 increases, and the inductive plate 162 is moved to extrude the hydraulic oil in the second chamber 164 into the adjusting chamber of the first hydraulic cylinder 150 corresponding to the hanger 140 on the lighter side, so that the two hangers 132 are adjusted to be inclined, i.e., the basket 130 drives the mold 400 to be deflected. At this time, the position sensor monitors the position of the inductive plate 162 and transmits it to the control system, and the position of the inductive plate 162 is recorded by the control system, so that it can be judged which side of the hanger 140 has a larger displacement according to the direction of movement of the inductive plate 162, and which side of the mold 400 has a larger eccentricity when casting the same batch of workpieces. After casting several times, the position exchange is realized by the self-rotation of the hanger 140 and the shell 120, and the hanger 140 on the high-wear side is matched with the hanger 132 on the low-wear side again, so that the wear degree of the two sides is balanced.

[0034] In a further embodiment, the lifting mechanism further comprises a top rod 170, which is installed on the shell 120 and coaxial with the shell 120, can move along the axial direction of the shell 120 and can rotate synchronously with the shell 120, is located on the side of the main rod 131 close to the shell 120 in the axial direction of the shell 120, and is provided with two abutting balls 171 on the end close to the main rod 131 in the axial direction thereof, and the main rod 131 is provided with an abutting surface for abutting with the abutting balls 171, which is an inclined surface.

[0035] The second hydraulic cylinder 180 is provided in the shell 120, the top rod 170 is arranged at the output end of the second hydraulic cylinder 180 and extends out of the shell 120 in the axial direction thereof, and the top rod 170 is installed at the output end of the second hydraulic cylinder 180 through the rotating column 142.

[0036] In this embodiment, the top rod 170 is provided, after the hanger 140 lifts the hanger 132, the second hydraulic cylinder 180 is started to drive the top rod 170 to move to the side close to the main rod 131 in the axial direction thereof, so that the abutting balls 171 can abut with the abutting surface, and then the abutting surface applies pressure to the main rod 131, so that the hanger 132 can be pressed with the hanger 140, and the locking is maintained.

[0037] In a further embodiment, the lifting mechanism further comprises a transmission member 190 for driving the two hangers 140 to rotate around their own axes, respectively.

[0038] The transmission member 190 comprises a motor 191, a main gear 192 and two driven gears 193. The motor 191 is fixedly installed in the housing 120, the main gear 192 is installed on the output shaft of the motor 191, and the driven gears 193 are coaxially arranged with the corresponding hoists 140 and are in key groove cooperation with the corresponding hoists 140, so that the hoists 140 can move relative to the corresponding driven gears 193 and the hoists 140 can rotate synchronously with the corresponding driven gears 193. The two driven gears 193 are in mesh with the main gear 192.

[0039] In the embodiment, when the two hoists 140 need to rotate around their own axes, the basket 130 is first disassembled, and then the motor 191 is started. The rotation of the main gear 192 driven by the motor 191 drives the rotation of the driven gears 193 in mesh with the main gear 192, and the rotation of the driven gears 193 drives the rotation of the corresponding hoists 140.

[0040] In a further embodiment, the first cylinder body 161 is provided with a first communication port 165 and a second communication port 166 for communicating with the first chamber 163. The first cylinder body 161 is also provided with a third communication port 167 and a fourth communication port 168 for communicating with the second chamber 164. The adjusting chambers of the two first hydraulic cylinders 150 are respectively in communication with the first communication port 165 and the third communication port 167, and the second communication port 166 and the fourth communication port 168 are respectively connected with external oil lines. The first communication port 165 and the third communication port 167 are coaxially arranged, and the second communication port 166 and the fourth communication port 168 are coaxially arranged.

[0041] The induction plate 162 is in H-shaped structure. The first cylinder body 161 is provided with two partitions 169, one of which is used to separate the first chamber 163 so that the first communication port 165 and the second communication port 166 are not in communication with each other, and the other partition 169 is used to separate the second chamber 164 so that the third communication port 167 and the fourth communication port 168 are not in communication with each other.

[0042] In the casting of the pipe-shaped investment casting mold 400 shown in Figure 2 When the pipe-shaped investment casting mold 400 shown in Figure 2When the investment mold 400 is eccentric, if the two booms 140 move relative to each other along their axial direction, the hydraulic oil in the adjusting chamber of one of the first hydraulic cylinders 150 will be forced into the first chamber 163 through the first connecting port 165. This will cause the sensing plate 162 to move, and the movement of the sensing plate 162 will cause the second connecting port 166 to passively draw oil from the external oil circuit. Furthermore, the movement of the sensing plate 162 will cause the oil in the second chamber 164 to be squeezed out through the third connecting port 167 and the fourth connecting port 168. The oil squeezed out from the third connecting port 167 will return to the adjusting chamber of the other first hydraulic cylinder 150, and the oil squeezed out from the fourth connecting port 168 will enter the external oil circuit connected to it.

[0043] like Figure 2 The tubular mold 400 shown has a relatively large horizontal dimension. Therefore, when the robotic arm drives the entire lifting mechanism to rotate, the linear velocity of the portion closer to the rotation axis is lower than that of the portion farther from the rotation axis. This results in poor uniformity of the coating on the mold 400. However, when the mold 400 is eccentric, causing the two lifting rods 140 to move relative to each other along their axial directions, the basket 130 will cause the mold 400 on it to deflect to a certain extent. This increases the linear velocity of the portion closer to the rotation axis when the robotic arm drives the entire lifting mechanism and the mold 400 to rotate, mitigating the adverse effects of the large difference in linear velocity on the coating process.

[0044] At this time, hydraulic oil can also be introduced into the third connecting port 167 or the fourth connecting port 168 through the external pipeline to actively control the sliding of the sensing plate 162. Through the cooperation of the sensing plate 162 and the two first hydraulic cylinders 150, the two lifting rods 140 are driven to move relative to each other along their axial direction in the opposite direction, thereby increasing the relative displacement of the two lifting rods 140 and further reducing the adverse effects on the coating of the casting mold 400 caused by the linear velocity of the part closer to the rotation axis being less than that of the part farther from the rotation axis.

[0045] Or, when for Figure 10 When the perforated valve body-shaped investment mold 400 shown is being cast, if it is eccentric, it will be adjusted according to the above process during lifting. Furthermore, because the refractory coating is difficult to penetrate deep into the holes during normal coating, the coating uniformity is poor. Therefore, during use, hydraulic oil can be introduced into the third connecting port 167 or the fourth connecting port 168 via an external pipeline to actively control the sliding of the induction plate 162. Through the cooperation of the induction plate 162 and the two first hydraulic cylinders 150, the two lifting rods 140 are driven to move relative to each other along their axial direction, increasing the relative displacement of the two lifting rods 140. This causes the entire lifting basket 130 and the perforated valve body-shaped investment mold 400 to actively deflect, increasing the inclination of the holes in the investment mold 400. See also...Figure 11 As shown, when the mechanical arm drives the whole lifting mechanism and the hole valve body shaped mold 400 to rotate, the hole valve body shaped mold 400 will revolve around the axis of the shell 120 along a circular trajectory, improving the speed of the refractory coating passing through the surface of the hole valve body shaped mold 400, increasing the coating probability of the refractory coating and the hole of the hole valve body shaped mold 400, and further improving the uniformity of coating. After the whole hanging basket 130 and the mold 400 are deflected in one direction and coated, hydraulic oil can be introduced into the third communication port 167 or the fourth communication port 168 through the external pipeline again, so that the whole hanging basket 130 and the hole valve body shaped mold 400 are deflected in the other direction and coated again, so that the refractory material can fully contact both ends of the hole valve body shaped mold 400, further improving the uniformity of coating and the forming quality of the hole valve body shaped mold 400.

[0046] In combination with the above embodiment, the specific working process is as follows: During casting, the mold 400 is first installed on the main rod 131 of the hanging basket 130, and then the mechanical hand is operated to lift the hanging arm 132 by the lifting hook 141, as shown in Figure 3 At this time, the lifting rod 140 and the hanging arm 132 are perpendicular to each other.

[0047] Then the shell 120 is controlled by the mechanical hand to drive the lifting rod 140 to rotate, so that the lifting hook 141 is rotated 90° relative to the hanging arm 132, and then the shell 120 is controlled by the mechanical hand to drive the lifting rod 140 and the hanging basket 130 to rise, completing the hoisting of the mold 400, as shown in Figure 4 .

[0048] After the hanging arm 132 is lifted by the lifting rod 140, the second hydraulic cylinder 180 is started to drive the top rod 170 to move along its axis direction to the side close to the main rod 131, so that the abutting ball 171 can abut against the abutting surface, and then the abutting surface is pressed to the main rod 131, so that the hanging arm 132 can be pressed to the lifting rod 140, and the locking is maintained.

[0049] If the mold 400 is not eccentric, the boom 132 and the jib 140 are in a balanced state, and the jib 140 and the boom 132 are not moved, and the sensing assembly is not actuated. When the mold 400 is eccentric, the two jibs 140 are relatively displaced in the axial direction, and the jib 140 on the heavier side pulls the piston rod 152 of the first hydraulic cylinder 150 corresponding thereto, and the hydraulic oil in the adjusting chamber of the first hydraulic cylinder 150 is extruded into the first chamber 163 or the second chamber 164. Assuming that the hydraulic oil is extruded into the first chamber 163, the volume of the hydraulic oil in the first chamber 163 is increased, and the sensing plate 162 is moved, and the hydraulic oil in the second chamber 164 is extruded into the adjusting chamber of the first hydraulic cylinder 150 corresponding to the jib 140 on the lighter side, so that the two booms 132 are adjusted to be inclined, that is, the basket 130 drives the mold 400 to be deflected. At this time, the position sensor monitors the position of the sensing plate 162 and transmits it to the control system, and the position of the sensing plate 162 is recorded by the control system, so that it can be judged which side of the jib 140 has a larger displacement according to the direction of the movement of the sensing plate 162, and which side of the mold 400 has a larger eccentricity when the same batch of workpieces is cast.

[0050] For the convenience of description, the two jibs 140 are referred to as a first rod and a second rod, and the two booms 132 are referred to as a first arm and a second arm. In the initial state, the first rod is connected to the first arm, and the second rod is connected to the second arm. If the first rod moves relative to the second rod after the mold 400 is connected, it can be considered that the first rod is on the heavier side, and the second rod is on the lighter side, and the wear between the first rod and the first arm is relatively larger. After casting several times, the basket 130 is first disassembled, and then the two jibs 140 are driven to rotate 180°, so that the hooks 141 of the first rod and the second rod face away from the booms 132, and the first rod and the second rod are driven to revolve 180° by the driving member 110, so that the first rod and the second rod are exchanged, and the positions of the two booms 132 are unchanged. Therefore, in the next use, the first rod is connected to the second arm, and the second rod is connected to the first arm, so that if the wear between the first rod and the first arm is larger in the initial state, the wear between the second rod and the first arm will be larger after the exchange, and the jib 140 on the side with high wear and the boom 132 on the side with low wear are re-matched, so that the wear degrees of the two sides are balanced, and the service life of the entire lifting part 100 is prolonged.

[0051] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precision casting shell-making machine, characterized in that: It includes a lifting section (100), a coating section (200), and a sand-spreading section (300); the lifting section (100) includes a drive unit (110) and a lifting mechanism, the lifting mechanism being mounted on the drive unit (110), the lifting mechanism including a housing (120), a basket (130), a sensing component, and two lifting rods (140); the housing (120) is cylindrical, the housing (120) is mounted on the drive unit (110), the drive unit (110) is used to drive the housing (120) to rotate around Its own axis rotates; two booms (140) are eccentrically arranged on the housing (120) and can rotate with the housing (120), the axis of the booms (140) is parallel to the axis of the housing (120), and in the initial state the two booms (140) are symmetrically arranged about the central axis of the housing (120); the booms (140) can move relative to the housing (120) along their axial direction and can rotate relative to the housing (120) about their own axis; the basket (130) includes The structure consists of a main rod (131) and two booms (132). The main rod (131) is coaxially mounted with the housing (120), and a casting mold (400) is connected to the main rod (131). The axis of the booms (132) is perpendicular to the axis of the main rod (131). The two booms (132) are coaxially mounted and both are installed on the main rod (131). The booms (132) and the lifting rods (140) are arranged in a one-to-one correspondence. The lifting rods (140) are equipped with hooks (141). The booms (132) and the lifting rods (140) are connected in a one-to-one correspondence. The lifting rods (140) are equipped with hooks (141). The hooks (141) on the corresponding booms (140) are connected; the sensing component is installed on the housing (120), and the relative movement of the two booms (140) in their axial direction can cause the sensing component to move. The sensing component is used to monitor the relative displacement of the two booms (140) in their axial direction; the coating part (200) is used to coat the mold (400) with refractory coating; the sand spreading part (300) is used to spread refractory sand on the coated mold (400).

2. The precision casting shell-making machine according to claim 1, characterized in that: Two first hydraulic cylinders (150) are provided inside the housing (120). The first hydraulic cylinders (150) and the boom (140) are arranged in a one-to-one correspondence. The boom (140) is located at the output end of the first hydraulic cylinder (150) and extends out of the housing (120) along its axial direction. The boom (140) can rotate relative to the first hydraulic cylinder (150) and can move synchronously with the output end of the first hydraulic cylinder (150).

3. The precision casting shell-making machine according to claim 2, characterized in that: The sensing component includes a sensing hydraulic cylinder (160), which is installed inside the housing (120). The sensing hydraulic cylinder (160) includes a first cylinder body (161) and a sensing plate (162). The sensing plate (162) is installed inside the first cylinder body (161) and slides and seals with the first cylinder body (161). The sensing plate (162) divides the interior of the first cylinder body (161) into a first chamber (163) and a second chamber (164). Both the first chamber (163) and the second chamber (164) are filled with hydraulic fluid. Oil; the first hydraulic cylinder (150) includes a second cylinder body (151) and a piston rod (152), the piston rod (152) and the second cylinder body (151) are slidably sealed, the first chamber (163) and the second chamber (164) are respectively connected to the chambers where the piston rod (152) is located on the two first hydraulic cylinders (150); a position sensor is provided in the first chamber (163) or the second chamber (164), the position sensor can monitor the position of the sensing plate (162) and convert it into a usable output signal to be transmitted to the external control system.

4. The precision casting shell-making machine according to claim 3, characterized in that: The boom (140) is connected to the output end of the first hydraulic cylinder (150) via a rotating column (142). The rotating column (142) is coaxially arranged with the boom (140). The outer peripheral wall of the rotating column (142) is coaxially and fixedly provided with an annular protrusion. The output end of the first hydraulic cylinder (150) is provided with an annular groove for rotating and cooperating with the annular protrusion.

5. A precision casting shell-making machine according to claim 3, characterized in that: The piston rod (152) includes a plate portion and a rod portion fixedly connected to the plate portion. The plate portion is slidably sealed to the second cylinder body (151). The plate portion divides the second cylinder body (151) into two independent chambers. Both chambers are filled with hydraulic oil. The rod portion passes through one of the chambers and extends out of the second cylinder body (151). The chamber where the rod portion is located is called the adjustment chamber. The first chamber (163) and the second chamber (164) are respectively connected to their corresponding adjustment chambers.

6. A precision casting shell-making machine according to claim 5, characterized in that: The first cylinder body (161) is provided with a first communication port (165) and a second communication port (166) for communicating with the first chamber (163); the first cylinder body (161) is also provided with a third communication port (167) and a fourth communication port (168) for communicating with the second chamber (164); the regulating chambers on the two first hydraulic cylinders (150) are respectively connected to the first communication port (165) and the third communication port (167), and the second communication port (166) and the fourth communication port (168) are respectively connected to the external oil circuit.

7. A precision casting shell-making machine according to claim 1, characterized in that: The lifting mechanism also includes a top rod (170), which is mounted on the housing (120) and coaxial with the housing (120). The top rod (170) can move relative to the housing (120) along its axial direction and can rotate synchronously with the housing (120). The top rod (170) is located on the side of the main rod (131) close to the housing (120) along the axial direction. Two abutment balls (171) are provided at the end of the top rod (170) close to the main rod (131) along its axial direction. The main rod (131) is provided with an abutment surface for abutting the abutment balls (171), and the abutment surface is an inclined surface.

8. A precision casting shell-making machine according to claim 7, characterized in that: A second hydraulic cylinder (180) is provided inside the housing (120), and a push rod (170) is provided at the output end of the second hydraulic cylinder (180) and extends out of the housing (120) along its axial direction.

9. A precision casting shell-making machine according to claim 1, characterized in that: The lifting mechanism also includes a transmission component (190) for driving the two booms (140) to rotate about their own axes.

10. A precision casting shell-making machine according to claim 1, characterized in that: The drive unit (110) is a robotic arm.

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