Ejection oil cylinder of injection molding machine

Abstract

The utility model discloses an ejection oil cylinder of an injection molding machine, and relates to the technical field of oil cylinders. A cylinder barrel front cover and a cylinder barrel rear cover are respectively arranged at two ends of the cylinder barrel, one end of the piston rod penetrates through the cylinder barrel front cover and extends into the cylinder barrel, a piston is arranged at the end of the piston rod in the cylinder barrel, two groups of piston guide rings are arranged between the cylinder barrel and the piston, and a front cover guide ring is arranged between the piston rod and the cylinder barrel front cover. And an annular sealing ring I is arranged between the two groups of piston guide rings. The first annular sealing ring can be used for secondary sealing of the piston, and the situation that the ejection oil cylinder does not act due to internal leakage of the oil cylinder can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, and more specifically, to an ejector oil cylinder for an injection molding machine. Background Art

[0002] Current injection molding machines use plastic molds to form various plastic products. Such molds should have ejectors or core pullers. The working principle of the cylinder is the same as that of a hydraulic jack. The ejector uses the force of the cylinder to eject the molded workpiece. After long-term use, the cross-section of the conventional ejector cylinder guide ring will gradually become thinner, and the piston and the inner hole of the cylinder will contact and rub, causing the cylinder to pull, resulting in leakage in the cylinder, and the ejector cylinder will not move. The workpiece cannot be ejected smoothly, seriously affecting the production process. Utility Model Content

[0003] In order to solve the above technical deficiencies, the utility model provides an ejector cylinder for an injection molding machine, which can be used for secondary sealing of a piston in the cylinder, thereby preventing the problem of internal leakage of the cylinder due to thinning of a guide ring.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: an ejector cylinder for an injection molding machine, comprising a cylinder barrel and a piston rod, with a cylinder barrel front cover and a cylinder barrel rear cover respectively provided at both ends of the cylinder barrel. One end of the piston rod extends through the cylinder barrel front cover into the cylinder barrel, a piston is provided at the end of the piston rod in the cylinder barrel, two sets of piston guide rings are provided between the cylinder barrel and the piston, a front cover guide ring is provided between the piston rod and the cylinder barrel front cover, and an annular sealing ring 1 is provided between the two sets of piston guide rings. The annular sealing ring 1 can be used for secondary sealing of the piston, effectively preventing leakage from the cylinder barrel, which could cause the ejector cylinder to fail to operate.

[0005] Preferably, an annular groove is provided in the outer circular wall of the piston, and an annular boss is provided on the bottom wall of the annular groove. The annular boss divides the annular groove into two groups of piston guide ring grooves. The outer circle diameter of the piston guide ring groove close to the annular boss is larger than the outer circle diameter of the other side. The piston guide ring is arranged in the piston guide ring groove, and an annular sealing ring is embedded in the outer circular wall of the annular boss.

[0006] Preferably, the piston guide ring and the front cover guide ring are made of phenolic cloth-reinforced resin. These hardened belts boast a surface compressive strength of 270N / mm², significantly greater than the currently used PTFE soft belts. These belts prevent creep during use, effectively isolating the cylinder barrel from contact with the piston, preventing damage to the barrel and extending the life of the cylinder.

[0007] Preferably, an oil-absorbing resin layer is provided between the annular sealing ring 1 and the piston, a plurality of guide grooves are provided on the outer wall of the annular boss, and a connecting channel is provided within the annular boss, connecting the piston guide ring grooves and the oil-absorbing resin layer. When hydraulic oil penetrates the piston guide ring, it first flows into the guide grooves from high to low, then flows through the guide grooves into the connecting channel, and then flows through the connecting channel into the cavity containing the oil-absorbing resin layer, where it is absorbed. After absorbing the oil, the oil-absorbing resin layer gradually expands, diffuses and absorbs the oil to a certain extent, and also presses against the annular sealing ring 1 on the side in contact with it, thereby further tightening the annular sealing ring 1 and the piston cavity, thereby improving the sealing performance of the piston.

[0008] Preferably, a plurality of sliding cavities are provided on the side wall of the installation cavity where the oil-absorbing resin layer is located, a plurality of push sliding grooves are provided in the bottom wall of the piston guide ring groove, an oil channel is provided between the push sliding groove and the sliding cavity, a sliding block is provided in the sliding cavity, a sliding rod 1 connected to the sliding block is provided in the end of the oil channel on the sliding cavity side, and a sliding rod 2 connected to the fixed push block is provided in the end of the oil channel on the fixed push cavity side.

[0009] When the oil-absorbing resin layer expands, it will be squeezed toward the slider on the side that is in contact with it. The slider moves toward the side of the sliding cavity, thereby driving the slide rod 1 to slide. The slide rod 1 pushes the hydraulic oil in the oil channel, so that it drives the slide rod 2 to move toward the side of the push slide groove. The movement of the slide rod 2 drives the push block to achieve fixed push movement. The push block pushes the piston guide ring to be further fitted with the piston cavity, thereby improving the sealing performance of the piston. The push at this location can act on the piston guide ring part at the internal leakage location, and the push block is an arc segment and is arranged in a circular array along the inner wall of the piston guide ring groove.

[0010] Preferably, a groove is provided on the inner wall of the annular sealing ring 1, and an annular protrusion adapted to the groove is provided on the annular boss, so as to increase the connection strength between the annular sealing ring 1 and the piston.

[0011] Preferably, a one-way valve is provided on the connecting channel to prevent backflow of the hydraulic oil.

[0012] As a preference, a second annular seal is provided between the cylinder front cover and the piston rod. It is used for secondary sealing between the piston rod and the cylinder front cover, which can effectively prevent leakage from the oil cylinder, resulting in the ejection oil cylinder not moving.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the annular sealing ring 1 can be used for secondary sealing of the piston, which can effectively prevent leakage of the oil cylinder and cause the ejection oil cylinder to fail to move; (2) the oil-absorbing resin layer can expand by absorbing oil to push up and squeeze the annular sealing ring 1 on the side in contact with it, so that the annular sealing ring 1 is further in contact with the piston cavity, thereby improving the sealing performance of the piston; (3) the oil-absorbing resin layer expands and squeezes the slider on the side in contact with it, thereby driving the ejection block to achieve fixed push movement, and the ejection block pushes the piston guide ring to be further in contact with the piston cavity, thereby improving the sealing performance of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of an ejector cylinder of an injection molding machine according to the utility model;

[0015] Figure 2 It is a partial structural diagram of the piston and cylinder combination of the utility model;

[0016] In the figure: cylinder 101; piston rod 102; cylinder front cover 103; cylinder rear cover 104; piston 105; piston guide ring 106; front cover guide ring 107; piston chamber 108; piston rod hole 109; oil inlet channel 110; annular seal ring 2 111; annular boss 113; piston guide ring groove 114; annular seal ring chamber 115; annular seal ring 116; groove 117; annular protrusion 118; oil-absorbing resin layer 119; guide groove 120; connecting channel 121; sliding cavity 122; push slide groove 123; oil channel 124; slider 125; push block 126; slide bar 127; slide bar 2 128; one-way valve 129. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the technical solution of the utility model through specific embodiments and in conjunction with the accompanying drawings:

[0018] Example 1: See attached Figure 1, an injection molding machine ejection cylinder, comprising a cylinder 101, a piston rod 102, a cylinder front cover 103, a cylinder rear cover 104, a piston 105, a piston guide ring 106, and a front cover guide ring 107; piston chambers 108 are provided on the left and right sides of the cylinder 101, and the cylinder rear cover 104 and the cylinder front cover 103 are respectively arranged at both ends of the cylinder 101, wherein the cylinder rear cover 104 blocks and seals the left side of the piston chamber 108 in the cylinder 101 by bolts, and a piston rod hole 109 is provided on the cylinder front cover 103, one end of the piston rod 102 passes through the piston rod hole 109 on the cylinder front cover 103 and extends into the piston chamber 108, and the piston 105 is fixedly arranged at the end of the piston rod 102 in the piston chamber 108. Two sets of piston guide rings 106 are provided between the piston cavity 108 and the piston 105. The inner circumference of the piston guide ring 106 is embedded in the outer circumference of the piston 105, and the outer circumference of the piston guide ring 106 abuts against the inner wall of the piston cavity 108. The cylinder front cover 103 is provided with an oil inlet channel 110 connected to the piston cavity.

[0019] An annular groove is provided in the outer circular wall of the piston 105, and an annular boss 113 is provided on the bottom wall of the annular groove. The annular boss 113 divides the annular groove into two groups of piston guide ring grooves 114 of equal width. The side wall of the piston guide ring groove 114 close to the annular boss 113 is higher than the other side wall of the piston guide ring groove, that is, the outer diameter of the annular ridge 113 is larger than the outer diameter of the piston 105 on the other side of the annular groove away from the side of the annular ridge 113. The piston guide ring is arranged in the piston guide ring groove 112. The design of the high and low side walls of the piston guide ring groove 112, the high side wall can serve as a support wall on one side of the piston guide ring 106 when the piston 105 moves, which can effectively slow down the deformation of the piston guide ring 106, thereby improving the sealing performance of the piston 105 when the piston rod 102 in the cylinder moves left and right.

[0020] The outer diameter of the annular boss 113 is slightly smaller than the inner diameter of the piston cavity 108. An annular sealing ring cavity 115 is further provided in the annular boss. An annular sealing ring 116 is provided in the annular sealing ring cavity 115 for secondary sealing of the piston 105. This can effectively prevent leakage from the oil cylinder, resulting in the ejection oil cylinder not being able to move.

[0021] Two groups of front cover guide rings 107 are provided between the piston rod 102 and the cylinder front cover 103, wherein the outer circle of the front cover guide ring 107 is embedded in the inner hole wall of the piston rod hole 109, and the outer circle of the front cover guide ring 107 abuts against the inner wall of the piston rod 102; an annular protrusion is provided on the inner hole wall of the piston rod hole 109, and an annular sealing ring cavity 2 is provided in the annular protrusion wall, and an annular sealing ring cavity 2 is provided in the annular sealing ring cavity 2, and two groups of spaced front cover guide ring cavities are provided on the inner hole wall of the piston rod hole 109 on the left side of the annular sealing ring cavity 2, and the front cover guide ring is set in the front cover guide ring cavity, and the annular sealing ring 2 is used for secondary sealing between the piston rod 102 and the cylinder front cover 104, which can effectively prevent leakage from the cylinder, resulting in the ejection cylinder not moving.

[0022] Example 2:

[0023] See attached Figure 1 , an injection molding machine ejection cylinder, comprising a cylinder 101, a piston rod 102, a cylinder front cover 103, a cylinder rear cover 104, a piston 105, a piston guide ring 106, and a front cover guide ring 107; piston chambers 108 are provided on the left and right sides of the cylinder 101, and the cylinder rear cover 104 and the cylinder front cover 103 are respectively arranged at both ends of the cylinder 101, wherein the cylinder rear cover 104 blocks and seals the left side of the piston chamber 108 in the cylinder 101 by bolts, and a piston rod hole 109 is provided on the cylinder front cover 103, one end of the piston rod 102 passes through the piston rod hole 109 on the cylinder front cover 103 and extends into the piston chamber 108, and the piston 105 is fixedly arranged at the end of the piston rod 102 in the piston chamber 108. Two sets of piston guide rings 106 are provided between the piston cavity 108 and the piston 105. The inner circumference of the piston guide ring 106 is embedded in the outer circumference of the piston 105, and the outer circumference of the piston guide ring 106 abuts against the inner wall of the piston cavity 108. The cylinder front cover 103 is provided with an oil inlet channel 110 connected to the piston cavity.

[0024] An annular groove is provided in the outer circular wall of the piston 105, and an annular boss 113 is provided on the bottom wall of the annular groove. The annular boss 113 divides the annular groove into two groups of piston guide ring grooves 114 of equal width. The side wall of the piston guide ring groove 114 close to the annular boss 113 is higher than the other side wall of the piston guide ring groove, that is, the outer diameter of the annular ridge 113 is larger than the outer diameter of the piston 105 on the other side of the annular groove away from the side of the annular ridge 113. The piston guide ring is arranged in the piston guide ring groove 112. The design of the high and low side walls of the piston guide ring groove 112, the high side wall can serve as a support wall on one side of the piston guide ring 106 when the piston 105 moves, which can effectively slow down the deformation of the piston guide ring 106, thereby improving the sealing performance of the piston 105 when the piston rod 102 in the cylinder moves left and right.

[0025] The outer diameter of the annular boss 113 is slightly smaller than the inner diameter of the piston cavity 108. An annular sealing ring cavity 115 is further provided in the annular boss. An annular sealing ring 116 is provided in the annular sealing ring cavity 115 for secondary sealing of the piston 105. This can effectively prevent leakage from the oil cylinder, resulting in the ejection oil cylinder not being able to move.

[0026] Two groups of front cover guide rings 107 are provided between the piston rod 102 and the cylinder front cover 103, wherein the outer circle of the front cover guide ring 107 is embedded in the inner hole wall of the piston rod hole 109, and the outer circle of the front cover guide ring 107 abuts against the inner wall of the piston rod 102; an annular protrusion 111 is provided on the inner hole wall of the piston rod hole 109, and an annular sealing ring cavity 2 is provided in the annular protrusion wall body, and an annular sealing ring cavity 2 is provided in the annular sealing ring cavity 2, and two groups of spaced front cover guide ring cavities are provided on the inner hole wall of the piston rod hole 109 on the left side of the annular sealing ring cavity 2, and the front cover guide ring is set in the front cover guide ring cavity, and the annular sealing ring 2 is used for secondary sealing between the piston rod 102 and the cylinder front cover 104, which can effectively prevent leakage from the cylinder, resulting in the ejection cylinder not moving.

[0027] In the oil cylinder described in the present invention, the piston guide ring 106 on the piston 105 and the front cover guide ring 107 on the cylinder front cover 103 are made of phenolic cloth-reinforced resin material, which is a hard belt with a surface compressive strength of 270N / mm2, which is much stronger than the currently used PTFE soft belt. During use, the hard belt will not creep, effectively isolating the contact between the cylinder and the piston, avoiding damage to the cylinder, and extending the service life of the oil cylinder.

[0028] Example 3:

[0029] See attached Figure 1 To the attached Figure 2This embodiment further defines the piston 105 based on the embodiment 1.

[0030] The inner wall of the annular sealing ring 116 is provided with a groove 117, which is an annular inner groove structure. An annular protrusion 118 is provided within the annular sealing ring cavity 116, which is adapted to fit within the groove 117. An oil-absorbing resin layer 119 is provided between the annular sealing ring 116 and the piston 105 to the right of the annular protrusion 118. A plurality of guide grooves 120 are circumferentially arrayed on the outer wall of the annular boss 113. A plurality of connecting channels 121 are provided within the annular boss 113, which connect the piston guide ring groove 112 with the oil-absorbing resin layer 119.

[0031] A plurality of sliding cavities 122 are provided in the side wall of the cavity where the oil-absorbing resin layer 119 is located, and a plurality of groups of pushing grooves 123 are provided in the bottom wall of the piston guide ring groove 112, an oil channel 124 is provided between the pushing groove 123 and the sliding cavity 122, a slider 125 is provided in the sliding cavity 122, a pushing block 126 is provided for sliding in the pushing groove 123, a sliding rod 127 is provided for sliding in the oil channel 124 in the bottom wall of the sliding cavity 122, and the other end of the sliding rod 127 is fixedly connected to the slider 125, a sliding rod 2 128 is provided for sliding in the oil channel 124 in the bottom wall of the pushing groove 123, and the other end of the sliding rod 2 128 is connected to the pushing block 127. When the hydraulic oil penetrates the piston guide ring 106, it will first flow into the guide groove 120 from high to low, and the hydraulic oil will flow into the connecting channel 121 through the guide groove 120, and then flow into the cavity where the oil-absorbing resin layer 119 is located through the connecting channel 121 and be absorbed by it. The oil-absorbing resin layer 119 will gradually expand after absorbing the oil, and the oil-absorbing resin layer 119 will diffuse and absorb to a certain extent after expansion, and will also squeeze toward the annular sealing ring 116 on the side that is in contact with it, so that the annular sealing ring 116 and the piston cavity 108 are further fitted together, thereby improving the sealing performance of the piston 105; at the same time, it will also squeeze toward the side that is in contact with it. The slider 125 is squeezed, and the slider 125 moves toward the side of the sliding cavity 122, thereby driving the slide bar 127 to slide, and the slide bar 127 pushes the hydraulic oil in the oil channel, so that it drives the slide bar 2 128 to move toward the side of the push slide groove 123, and the movement of the slide bar 2 128 drives the push block 127 to achieve fixed push movement, and the push block 127 pushes the piston guide ring and the piston cavity 108 to be further close, thereby improving the sealing performance of the piston 105. The push at this place can act on the piston guide ring 106 part at the internal leakage point, and the push block 127 is an arc segment and is arranged in a circular array along the inner wall of the piston guide ring groove 112.

[0032] The beneficial effects are: (1) the annular sealing ring 1 can be used for secondary sealing of the piston, which can effectively prevent leakage from the oil cylinder and cause the ejection oil cylinder to fail to move; (2) the oil-absorbing resin layer can expand by absorbing oil to push up and squeeze the annular sealing ring 1 on the side in contact with it, so that the annular sealing ring 1 is further in contact with the piston cavity, thereby improving the sealing performance of the piston; (3) the oil-absorbing resin layer expands and squeezes the slider on the side in contact with it, thereby driving the push block to achieve fixed push movement, and the push block pushes the piston guide ring to be further in contact with the piston cavity, thereby improving the sealing performance of the piston.

[0033] Example 4:

[0034] See attached Figure 1 To the attached Figure 2 This embodiment further defines the piston 105 based on the embodiment 1.

[0035] The inner wall of the annular sealing ring 116 is provided with a groove 117, which is an annular inner groove structure. An annular protrusion 118 is provided within the annular sealing ring cavity 116, which mates with the groove 117. An oil-absorbing resin layer 119 is provided between the annular sealing ring 116 and the piston 105 to the right of the annular protrusion 118. A plurality of guide grooves 120 are circumferentially arrayed on the outer wall of the annular boss 113. Several connecting channels 121 are provided within the annular boss 113, connecting the piston guide groove 112 with the oil-absorbing resin layer 119. A one-way valve 129 is provided in each connecting channel 121 to prevent backflow of hydraulic oil.

[0036] A plurality of sliding cavities 122 are provided in the side wall of the cavity where the oil-absorbing resin layer 119 is located, and a plurality of groups of pushing grooves 123 are provided in the bottom wall of the piston guide ring groove 112, an oil channel 124 is provided between the pushing groove 123 and the sliding cavity 122, a slider 125 is provided in the sliding cavity 122, a pushing block 126 is provided for sliding in the pushing groove 123, a sliding rod 127 is provided for sliding in the oil channel 124 in the bottom wall of the sliding cavity 122, and the other end of the sliding rod 127 is fixedly connected to the slider 125, a sliding rod 2 128 is provided for sliding in the oil channel 124 in the bottom wall of the pushing groove 123, and the other end of the sliding rod 2 128 is connected to the pushing block 127. When the hydraulic oil penetrates the piston guide ring 106, it will first flow into the guide groove 120 from high to low, and the hydraulic oil will flow into the connecting channel 121 through the guide groove 120, and then flow into the cavity where the oil-absorbing resin layer 119 is located through the connecting channel 121 and be absorbed by it. The oil-absorbing resin layer 119 will gradually expand after absorbing the oil, and the oil-absorbing resin layer 119 will diffuse and absorb to a certain extent after expansion, and will also squeeze toward the annular sealing ring 116 on the side that is in contact with it, so that the annular sealing ring 116 and the piston cavity 108 are further fitted together, thereby improving the sealing performance of the piston 105; at the same time, it will also squeeze toward the side that is in contact with it. The slider 125 is squeezed, and the slider 125 moves toward the side of the sliding cavity 122, thereby driving the slide bar 127 to slide, and the slide bar 127 pushes the hydraulic oil in the oil channel, so that it drives the slide bar 2 128 to move toward the side of the push slide groove 123, and the movement of the slide bar 2 128 drives the push block 127 to achieve fixed push movement, and the push block 127 pushes the piston guide ring and the piston cavity 108 to be further close, thereby improving the sealing performance of the piston 105. The push at this place can act on the piston guide ring 106 part at the internal leakage point, and the push block 127 is an arc segment and is arranged in a circular array along the inner wall of the piston guide ring groove 112.

[0037] The beneficial effects are: (1) the annular sealing ring 1 can be used for secondary sealing of the piston, which can effectively prevent leakage from the oil cylinder and cause the ejection oil cylinder to fail to move; (2) the oil-absorbing resin layer can expand by absorbing oil to push up and squeeze the annular sealing ring 1 on the side in contact with it, so that the annular sealing ring 1 is further in contact with the piston cavity, thereby improving the sealing performance of the piston; (3) the oil-absorbing resin layer expands and squeezes the slider on the side in contact with it, thereby driving the push block to achieve fixed push movement, and the push block pushes the piston guide ring to be further in contact with the piston cavity, thereby improving the sealing performance of the piston.

Claims

1. An injection molding machine ejector cylinder, characterized in that: It includes a cylinder and a piston rod, with a cylinder front cover and a cylinder rear cover respectively provided at both ends of the cylinder, one end of the piston rod passes through the cylinder front cover and extends into the cylinder, a piston is provided at the end of the piston rod in the cylinder, two sets of piston guide rings are provided between the cylinder and the piston, a front cover guide ring is provided between the piston rod and the cylinder front cover, and an annular sealing ring is provided between the two sets of piston guide rings.

2. The ejector cylinder of an injection molding machine according to claim 1, characterized in that: An annular groove is provided in the outer circular wall of the piston, and an annular boss is provided on the bottom wall of the annular groove. The annular groove is divided into two groups of piston guide ring grooves by the annular boss. The outer circle diameter of the piston guide ring groove on one side close to the annular boss is larger than the outer circle diameter on the other side. The piston guide ring is arranged in the piston guide ring groove, and an annular sealing ring is embedded in the outer circular wall of the annular boss.

3. The ejector cylinder of an injection molding machine according to claim 1 or 2, characterized in that: The piston guide ring and the front cover guide ring are both made of phenolic cloth-reinforced resin.

4. The ejector cylinder of an injection molding machine according to claim 2, characterized in that: An oil-absorbing resin layer is provided between the annular sealing ring and the piston, a plurality of guide grooves are provided on the outer wall of the annular boss, and a connecting channel is provided inside the annular boss to communicate with the piston guide ring groove and the oil-absorbing resin layer.

5. The ejector cylinder of an injection molding machine according to claim 4, characterized in that: A plurality of sliding cavities are provided on the side wall of the installation cavity where the oil-absorbing resin layer is located, a plurality of push sliding grooves are provided in the bottom wall of the piston guide ring groove, an oil channel is provided between the push sliding groove and the sliding cavity, a sliding block is provided in the sliding cavity, a sliding rod 1 connected to the sliding block is provided in the end of the oil channel on the sliding cavity side, and a sliding rod 2 connected to the fixed push block is provided in the end of the oil channel on the fixed push cavity side.

6. The ejector cylinder of an injection molding machine according to claim 5, characterized in that: A groove is provided on the inner ring wall of the annular sealing ring, and an annular protrusion adapted to the groove is provided on the annular boss.

7. The ejector cylinder of an injection molding machine according to claim 6, characterized in that: A one-way valve is provided on the connecting channel.

8. The ejector cylinder of an injection molding machine according to any one of claims 4 to 7, characterized in that: A sealing ring is provided between the cylinder front cover and the piston rod.

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